SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING GENERAL DESCRIPTION KEY PRODUCT FEATURES • Low Voltage Operation The SX8654, SX8655 and SX8656 belong to a family (cid:1) 2.3V to 3.6V Supply of high performance haptics enabled 4/5-wire resistive touch screen controller with proximity (cid:1) Integrated Low Drop Out (LDO) Regulator detection, optimized for hand held applications such • Low Power Consumption as mobile phones, portable music players, game (cid:1) 30uA@2.3V 8ksps (ESR) machines, point-of-sales terminal and other (cid:1) 0.4uA Shut-Down Current consumer and industrial applications. They feature a wide input supply range from 2.3V to 3.6V. • 4/5-Wire Touchscreen Interface (cid:1) Precision, Ratiometric 12-bit ADC The controller computes touch screen X-Y coordinates and touch pressure with a precision, low (cid:1) Up to 5000 (X-Y) coordinates/second (c/s) power 12-bit analog-digital converter. On-chip data (cid:1) Programmable Digital Filtering/Averaging averaging processing algorithms can be activated to (cid:1) Touch Pressure Measurement (4-Wire) reduce host activity and suppress system noise. The (cid:1) Programmable Operating Mode (Manual, processing core features low power modes which Pen Detect, Pen Trigger) intelligently minimize current in operation as well as in • Capacitive Proximity Sensing (SX8654/56) automatic shut-down. (cid:1) No Additional Components Required A capacitive proximity detection circuit has been (cid:1) Uses Resistive Touchscreen or a Simple integrated into the SX8654 and SX8656 to enable Conductive Area as the Sensor host controlled power management for battery applications. Proximity detection above 5 cm is (cid:1) >5 cm Detection Distance possible using either the resistive touch screen as the (cid:1) 8uA @ 200ms Scan Period sensor or with a single conductive plate, with (cid:1) Fully Programmable (Sensitivity, etc) communication to the host via the serial interface. • Haptics Driver for LRA and ERM (SX8654/55) The SX8654 and SX8655 also integrate a haptics (cid:1) Haptics Waveform Generation Control (I2C motor driver for Linear Resonant Actuator (LRA) and or PWM Input) Eccentric Rotating Mass (ERM) micro motors with up (cid:1) Short Circuit Protection to 250mA drive current. Haptics control can be (cid:1) Early Warning and Over-Temperature performed using either an external PWM signal or the Monitoring and Protection I2C serial interface, providing simple host interfacing and minimizing its I/O requirement. • 400kHz I2C Serial Interface Integrated very high ESD protection, of up to ±15kV • Several Host Operating Modes Available on display inputs not only saves cost and board area, (cid:1) Maskable Interrupt Output (NIRQ) but also increases application reliability. (cid:1) Real-time Events Monitoring (AUX1-3) The three devices have an ambient operating (cid:1) Polling (I2C) temperature range of -40°C to +85°C, and are offere d • Hardware, Software, and Power-On Reset in both a 4mm x 4mm, 20-lead QFN package and • -40°C to +85°C Operating Temperature Range 2.07mm x 2.07mm 19-lead CSP package for space- conscious applications. • 15kV HBM & IEC ESD Protection • Small Footprint Packages TYPICAL APPLICATIONS • Pb & Halogen Free, RoHS/WEEE compliant • Game Machines, Portable Music Players • Mobile Phones • DSC, DVR, Phones • POS/POI Terminals M • Touch-Screen Monitors HAPTICS DRIVER ORDERING INFORMATION NRST Part Number Package Marking SX8654 Host SX8654IWLTRT QFN-20 I2C CVBA Controller SX8654ICSTRT WLCSP-19 NIRQ SX8655IWLTRT QFN-20 TOUCHSCREEN SX8655ICSTRT WLCSP-19 RB2A CONTROL SX8656IWLTRT QFN-20 RC95 SX8656ICSTRT WLCSP-19 SX8654EVK Evaluation Kit - PROXIMITY SENSING Rev 1 – 25th July 2011 1 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Table of Contents GENERAL DESCRIPTION.....................................................................................................................1 TYPICAL APPLICATIONS.....................................................................................................................1 ORDERING INFORMATION...................................................................................................................1 KEY PRODUCT FEATURES..................................................................................................................1 1 GENERAL DESCRIPTION............................................................................................................4 1.1 Marking Information 4 1.1.1 SX8654 4 1.1.2 SX8655 4 1.1.3 SX8656 4 1.2 Pin Diagrams 5 1.2.1 QFN Package 5 1.2.2 CSP Package 5 1.3 Pin Description 6 1.4 Block Diagram 7 2 ELECTRICAL CHARACTERISTICS...............................................................................................9 2.1 Absolute Maximum Ratings 9 2.2 Thermal Characteristics 9 2.3 Electrical Specifications 9 3 TYPICAL OPERATING CHARACTERISTICS...............................................................................12 4 TOUCHSCREEN INTERFACE.....................................................................................................13 4.1 Introduction 13 4.2 Coordinates Measurement 14 4.2.1 4-wire Touchscreen 14 4.2.2 5-wire Touchscreen 15 4.3 Pressure Measurement (4-wire only) 15 4.3.1 Bias Time (POWDLY) 16 4.4 Pen Detection 16 4.5 Digital Processing 17 4.6 Host Operation 19 4.6.1 Overview 19 4.6.2 Manual Mode (MAN) 19 4.6.3 Pen Detect Mode (PENDET) 20 4.6.4 Pen Trigger Mode (PENTRG) 20 4.6.5 Maximum Throughput vs. TOUCHRATE setting 21 5 PROXIMITY SENSING INTERFACE (SX8654/56).......................................................................23 5.1 Introduction 23 5.2 Analog Front-End (AFE) 24 5.2.1 Capacitive Sensing Basics 24 5.2.2 AFE Block Diagram 25 5.2.3 Capacitance-to-Voltage Conversion (C-to-V) 26 5.2.4 Shield Control 26 5.2.5 Offset Compensation 26 5.2.6 Analog-to-Digital Conversion (ADC) 27 5.3 Digital Processing 27 5.3.1 Overview 27 5.3.2 PROXRAW Update 28 5.3.3 PROXUSEFUL Update 29 5.3.4 PROXAVG Update 30 Rev 1 – 25th July 2011 2 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 5.3.5 PROXDIFF Update 32 5.3.6 PROXSTAT Update 32 5.4 Host Operation 33 5.4.1 General Description 33 5.4.2 Proximity Sensing vs Touch Operations 33 5.4.3 Minimum Scan Period (i.e. PROXSCANPERIOD) 35 6 HAPTICS INTERFACE (SX8654/55)..........................................................................................36 6.1 Introduction 36 6.2 ERM Load 36 6.2.1 Introduction 36 6.2.2 PWM Mode 37 6.2.3 I2C Mode 37 6.3 LRA Load 37 6.3.1 Introduction 37 6.3.2 PWM Mode 38 6.3.3 I2C Mode 38 6.4 Short-Circuit Protection 38 7 TEMPERATURE SENSOR..........................................................................................................39 8 INTERRUPT (NIRQ)..................................................................................................................40 8.1 Introduction 40 8.2 Registers Overview 40 8.2.1 RegIrqMsk 40 8.2.2 RegIrqSrc 40 8.2.3 RegStat 40 8.3 Host Procedure 40 9 AUXILIARY PINS (AUX1/AUX2/AUX3)......................................................................................41 10 RESET......................................................................................................................................42 10.1 Hardware (POR and NRST) 42 10.2 Software (RegReset) 42 10.3 ESD Event (RESETSTAT) 42 11 I2C INTERFACE........................................................................................................................43 11.1 Introduction 43 11.2 I2C Address 43 11.3 Write Register 43 11.4 Read Register 44 11.5 Write Command (Touchscreen Interface) 44 11.6 Read Channel (Touchscreen Interface) 45 12 REGISTERS DETAILED DESCRIPTION......................................................................................47 13 APPLICATION INFORMATION...................................................................................................59 13.1 Typical Application Circuit 59 13.2 External Components Recommended Values 59 14 PACKAGING INFORMATION.....................................................................................................60 14.1 QFN Package 60 14.2 CSP Package 61 Rev 1 – 25th July 2011 3 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 1 GENERAL DESCRIPTION 1.1 Marking Information 1.1.1 SX8654 Figure 1 – Marking Information – QFN(left) – CSP(right) 1.1.2 SX8655 Figure 2 – Marking Information – QFN(left) – CSP(right) 1.1.3 SX8656 Figure 3 – Marking Information – QFN(left) – CSP(right) Rev 1 – 25th July 2011 4 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 1.2 Pin Diagrams 1.2.1 QFN Package Figure 4 – Pin Diagram – QFN Note that haptics pins (MVDD, MGND, MIN, MOUTN, MOUTP) are not used on SX8656. (Cf. § 1.3) 1.2.2 CSP Package Figure 5 – Pin Diagram - CSP Note that haptics pins (MVDD, MGND, MIN, MOUTN, MOUTP) are not used on SX8656. (Cf. § 1.3) Rev 1 – 25th July 2011 5 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 1.3 Pin Description Name Type Description VDD P Main Power Supply GND P Main Ground VREG P Internal Regulator Output (must be connected to an external capacitor; see § 13) SX8654/55 : Haptics Motor Power Supply MVDD P SX8656 : Not used, connect to VDD. SX8654/55 : Haptics Motor Ground (must be electrically connected to GND) MGND P SX8656 : Not used, connect to GND. SX8654/55 : Haptics Motor Positive Drive MOUTP AO SX8656 : Not used, do not connect. SX8654/55 : Haptics Motor Negative Drive MOUTN AO SX8656 : Not used, do not connect. SX8654/55 : Haptics Motor PWM/Clock Input MIN DI SX8656 : Not used, connect to GND. • 4-wire Touchscreen : X+ Electrode X+/BR A • 5-wire Touchscreen : Bottom Right (BR) Electrode • 4-wire Touchscreen : Y+ Electrode Y+/TR A • 5-wire Touchscreen : Top Right (TR) Electrode • 4-wire Touchscreen : X- Electrode X-/TL A • 5-wire Touchscreen : Top Left (TL) Electrode • 4-wire Touchscreen : Y- Electrode Y-/BL A • 5-wire Touchscreen : Bottom Left (BL) Electrode • 4-wire Touchscreen : First Programmable Auxiliary Function (see § 9) AUX1/WIPER D/A • 5-wire Touchscreen : WIPER Electrode AUX2 D/A Second Programmable Auxiliary Function (see § 9) AUX3 D/A Third Programmable Auxiliary Function (see § 9) ADDR DI I2C Address Selection (QFN only, internally connected to GND on CSP) SCL DI I2C Clock Input SDA DIO I2C Data Input/Output NIRQ DO Interrupt Output (active low) NRST DI Reset Input (active low) A/D/I/O/P: Analog/Digital/Power/Input/Output Table 1 – Pin Description Rev 1 – 25th July 2011 6 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 1.4 Block Diagram Figure 6 – SX8654 Block Diagram Figure 7 – SX8655 Block Diagram Rev 1 – 25th July 2011 7 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Figure 8 – SX8656 Block Diagram Rev 1 – 25th July 2011 8 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 2 ELECTRICAL CHARACTERISTICS 2.1 Absolute Maximum Ratings Stress above the limits listed in the following table may cause permanent failure. Exposure to absolute ratings for extended time periods may affect device reliability. The limiting values are in accordance with the Absolute Maximum Rating System (IEC 134). All voltages are referenced to ground (GND). Symbol Description Conditions Min Max Unit VABS Voltage applied on any pin - 0.5 3.9 V X+/BR, Y+/TR, X-/TL, Electrostatic handling +/-15(1), +/-8(2) VESDHBM Y-/BL, VDD, MVDD kV Human Body Model (HBM) Other pins +/-8(2) X+/BR, Y+/TR, X-/TL, Electrostatic handling +/-1 VESDCDM Y-/BL, VDD, MVDD kV Charged Device Model (CDM) Other pins +/-1 X+/BR, Y+/TR, X-/TL, Electrostatic handling +/-250 VESDMM Y-/BL, VDD, MVDD V Machine Model (MM) Other pins +/-250 Electrostatic handling X+/BR, Y+/TR, X-/TL, VESDCD +/-15 kV Contact Discharge (CD) Y-/BL, VDD, MVDD TAMB Operating ambient temperature -40 +85 °C TJUN Operating junction temperature -40 +125 °C TSTOR Storage temperature -55 +150 °C ILAT Latch-up current(3) +/-100 mA (1) Tested to TLP (10A) (2) Tested to JEDEC standard JESD22-A114 (3) Tested to JEDEC standard JESD78 Table 2 - Absolute Maximum Ratings 2.2 Thermal Characteristics Symbol Description Conditions Min Max Unit Thermal Resistance Junction – Ambient θJAQ - - 30.5 °C/W QFN package Thermal Resistance Junction – Ambient θJAW - - 29 °C/W WLCSP package Table 3 – Thermal Characteristics 2.3 Electrical Specifications Table below applies to full supply voltage and temperature range, unless otherwise specified. Typical values are given for T = +25°C, VDD=VDDM=3.3V. A Symbol Description Conditions Min Typ. Max Unit Supply VDD Main supply voltage - 2.3 - 3.6 V OFF IDD Main supply current (MAN mode, no command, - 0.4 0.75 uA HAPT OFF) WAIT (PENDET/TRG mode, pen up, - 1.7 - PROX OFF, HAPT OFF) TOUCH1 (PENTRG mode, pen down, X+Y, RATE=4kcps, Nfilt=1, - 30 - POWDLY=0.5us, touchscreen current excluded, HAPT OFF, VDD=2.3V) TOUCH2 (PENTRG mode, pen down, X+Y, RATE=3kcps, Nfilt=7, - 120 160 POWDLY=0.5us, touchscreen current excluded, HAPT OFF) Rev 1 – 25th July 2011 9 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Symbol Description Conditions Min Typ. Max Unit PROX (PENDET/TRG mode, pen up, TOUCHRATE=80cps, PROX ON, SCANPERIOD=200ms, - 8 20 HIGHIM=ON, SENSITIVITY=Max, FREQ=150kHz, BOOST=OFF, HAPT OFF) HAPT (MAN mode, no command, LRA-PWM mode, - 115 145 MIN= 44.8kHz/50%, GAIN = Max, BW = 100, MOUTP/N floating, Squelch=011) MVDD Haptics supply voltage - VDD - 3.6 V OFF - 0.01 1 µA SQUELCH MIDD Haptics supply current (LRA-PWM mode, MIN= 44.8kHz/50%, GAIN = Max, - 6 10 µA BW = 100, MOUTP/N floating, Squelch=011) Digital I/Os (ADDR, SCL, SDA, NRST, NIRQ, AUX1, AUX2, AUX3, MIN) SCL, SDA, NRST 0.8*VDD - 3.6 VIH High level input voltage V Other pins 0.8*VDD - VDD+0.2 VIL Low level input voltage - -0.3 - 0.8 V ILEAK Input leakage current - -1 - 1 µA CI Input capacitance - - 5 - pF VOH High level output voltage IOH = 4mA 0.8*VDD - - V VOL Low level output voltage IOL = 4mA - - 0.4 V VPULL External pull-up voltage SCL, SDA, NRST, NIRQ - - 3.6 V Haptics Interface Maximum drive current IDRV MVDD = 3.6V - 250 - mA (MOUTP/MOUTN) LRA or ERM, PWM or I2C, VOFF Output squelch differential error AmplitudeCode within squelch 0(1) 0 0(1) mV (from 0V ideal) range, GAIN = Max, BW = 100, MOUTP/N floating, Squelch=011 LRA or ERM, I2C, VERR Output differential error AmplitudeCode = +127 (Max) 125(2) 0 125(2) mV (from 1.135V ideal) GAIN = Min, BW = 100, MOUTP/N floating VDRV Drive voltage (MOUTP/MOUTN) - - - VDDM V From MVDD/MGND, VDROP Drop voltage (MOUTP/MOUTN) - - 150 mV @250mA ISHORT Short-circuit detection current Measured @MIDD - 300 - mA Motor input (MIN) frequency in FMINC 40-60% duty cycle - - 50 MHz I2C mode Motor input (MIN) frequency in HAPTRANGE = 0 12.8 - 25.6 kHz FMINP PWM mode HAPTRANGE = 1 25.6 - 51.2 kHz Motor input (MIN) duty cycle in DCMIN 2 - 98 % PWM mode TWRNG Warning temperature - 120 - Junction temperature °C TALRM Alarm temperature - 155 - Touchscreen Interface ARES ADC resolution 12 - - bits AOFF ADC offset - ± 1 - AGE ADC gain error At full scale - 0.5 - LSB ADNL ADC differential non-linearity - ± 1 - AINL ADC integral non-linearity - ± 1.5 - RBIAS Biasing resistance - 5 - Ω Proximity Sensing Interface External capacitance to be CDC - - - 300 pF compensated t Scan period (reaction time) Programmable - 200 - ms PROX Rev 1 – 25th July 2011 10 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Symbol Description Conditions Min Typ. Max Unit Reset VPOR Power-On-Reset voltage Cf. § 10 - 1.3 - V t Reset time after POR Cf. § 10 - - 1 ms RESET t Reset pulse from host uC Cf. § 10 1 - - us PULSE I2C Interface f SCL clock frequency - - - 400 kHz SCL Hold time (repeated) START t - 0.6 - - µs HD;STA condition t LOW period of the SCL clock - 1.3 - - µs LOW t HIGH period of the SCL clock - 0.6 - - µs HIGH Set-up time for a repeated t - 0.6 - - µs SU;STA START condition t Data hold time - 0 - - µs HD;DAT t Data set-up time - 100 - - ns SU;DAT t Rise time of both SDA and SCL - 20+0.1C - 300 ns r b t Fall time of both SDA and SCL - 20+0.1C - 300 ns f b t Set-up time for STOP condition - 0.6 - - µs SU;STO Bus free time between a STOP t - 1.3 - - µs BUF and START condition C Capacitive load for each bus line - - - 400 pF b Up to 0.3xVDD from Pulse width of spikes t GND, down to 0.7xVDD 50 - - ns SP suppressed by the input filter from VDD Miscellaneous FOSCL Low frequency internal oscillator - - 32 - kHz FOSCH High frequency internal oscillator - - 1.8 - MHz (1) Guaranteed by design. (2) PWM mode can introduce an additional error of 2.5% of full scale. Table 4 – Electrical Specifications Rev 1 – 25th July 2011 11 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 3 TYPICAL OPERATING CHARACTERISTICS Conditions as defined in § 2.3, T = +25°C, VDD=VDDM=3.3V unless otherwise specified. A IDD_OFF vs VDD vs TEMP IDD_WAIT vs VDD vs TOUCHRATE 4.00E-07 8 3.80E-07 7 3.60E-07 6 3.40E-07 5 3.20E-07 10cps IDD(A)3.00E-07 28-4550°°CC°C IDD(uA)4 825000c00p00sccppss 2.80E-07 3 2.60E-07 2 2.40E-07 1 2.20E-07 0 2.00E-07 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 2.3 2.5 2.7 2.V9DD(V) 3.1 3.3 3.5 VDD(V) IDD_PROX vs SCANPERIOD vs SENSITIVITY IDD_HAPT vs VDD vs TEMP 80 0.0002 0.00019 70 0.00018 60 0.00017 IDD_PROX(uA)4500 057((MMianx)) IDD(A)000...000000000111456 28-4550°°CC°C 30 0.00013 20 0.00012 10 0.00011 0 0.0001 0 100 200 300 400 500 600 700 800 2.3 2.5 2.7 2.9 3.1 3.3 3.5 SCANPERIOD(ms) VDD(V) MIDD_OFF vs MVDD vs TEMP MIDD_SQUELCH vs MVDD vs TEMP 5.00E-08 1.00E-05 4.50E-08 4.00E-08 9.00E-06 3.50E-08 3.00E-08 8.00E-06 MIDD(A)2.50E-08 28-4550°°CC°C IDD(A) 28-4550°°CC°C 2.00E-08 7.00E-06 1.50E-08 1.00E-08 6.00E-06 5.00E-09 0.00E+00 5.00E-06 2.3 2.5 2.7 2.9 3.1 3.3 3.5 2.3 2.5 2.7 2.9 3.1 3.3 3.5 MVDD(V) MVDD(V) VERR vs GAIN vs MVDD 0.08 0.07 0.06 VOFF(V) 2.3V 0.05 3.3V 3.6V 0.04 0.03 0.02 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 GAIN Rev 1 – 25th July 2011 12 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 4 TOUCHSCREEN INTERFACE 4.1 Introduction The purpose of the touchscreen interface is to measure and extract touch information like coordinates and pressure. This is done in two steps, first an ADC measures the analog signal coming from the screen, and then digital processing is performed to consolidate the data. As illustrated below the chip’s touchscreen interface is compatible with both 4-wire and 5-wire touchscreens. Touchscreen type is defined by parameter TSTYPE. Figure 9 – Touchscreen Interface Overview A 4-wire resistive touch screen consists in two (resistive) conductive sheets separated by an insulator when not pressed. Each sheet is connected through 2 electrodes at the border of the sheet. When a pressure is applied on the top sheet, a connection with the lower sheet is established. Figure 10 – 4-wire Touchscreen A 5-wire resistive touch screen consists in two (resistive) conductive sheets separated by an insulator when not pressed. 4 electrodes are connected on the 4 corners of the bottom conductive sheet. They are referred as Top Left (TL), Top Right (TR), Bottom Left (BL) and Bottom Right (BR). The fifth wire (WIPER) is used for sensing the top sheet voltage. When a pressure is applied on the top sheet, a connection with the lower sheet is established. Rev 1 – 25th July 2011 13 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Higher reliability and better endurance are the advantages of 5-wire touchscreens but they do not allow pressure measurement Figure 11 – 5-wire Touchscreen 4.2 Coordinates Measurement 4.2.1 4-wire Touchscreen The electrode plates are internally connected through terminals X+, X- and Y+, Y- to an analog to digital converter (ADC) and a reference voltage (Vref). The resistance between the terminals X+ and X- is defined by Rxtot. Rxtot will be split in 2 resistors, R1 and R2, in case the screen is touched. Similarly, the resistance between the terminals Y+ and Y- is represented by R3 and R4. The connection between the top and bottom sheet is represented by the touch resistance (RT). In order to measure the Y coordinate, the top resistive sheet (Y) is biased with a voltage source (Vref). Resistors R3 and R4 determine a voltage divider proportional to the Y position of the contact point. Since the converter has a high input impedance, no current flows through R1 (and RT) so that the voltage X+ at the converter input is given by the voltage divider created by R3 and R4. The X coordinate is measured in a similar fashion with the bottom resistive sheet (X) biased to create a voltage divider by R1 and R2, while the voltage on the top sheet is measured through R3. The resistance RT is the resistance obtained when a pressure is applied on the screen. RT is created by the contact area of the X and Y resistive sheet and varies with the applied pressure. Figure 12 – 4-wire Touchscreen Coordinates Measurement The X and Y positions output by the ADC correspond to the formulas below: R2 R4 Xpos = 4095(cid:215) --------------------- Ypos = 4095(cid:215) --------------------- R1+R2 R3+R4 4095 corresponds to the max output value of the ADC (12 bits => 212 – 1). For example, a touch in the center of the screen will output (Xpos, Ypos) = ~(2048, 2048) Rev 1 – 25th July 2011 14 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 4.2.2 5-wire Touchscreen 5-wire touchscreen coordinates measurement is performed similarly by biasing opposite corner pairs in either X or Y directions on the lower panel, and converting the voltage appearing on the wiper panel with the ADC. Figure 13 – 5-wire Touchscreen Coordinates Measurement The X and Y positions output by the ADC correspond to the formulas below: R2 R4 Xpos = 4095(cid:215) --------------------- Ypos = 4095(cid:215) --------------------- R1+R2 R3+R4 4095 corresponds to the max output value of the ADC (12 bits => 212 – 1). For example, a touch in the center of the screen will output (Xpos, Ypos) = ~(2048, 2048) 4.3 Pressure Measurement (4-wire only) The pressure measurement consists in extracting the touch resistance R via two additional setups z1 and z2 T illustrated below. The smaller R , the more common touched surface there is between top and bottom plates T and hence the more “pressure” there is by the user. Figure 14 – Pressure Measurement The z1 and z2 values output by the ADC correspond to the formulas below: R4 R4+Rt z1 = 4095(cid:215) ---------------------------------- z2 = 4095(cid:215) ---------------------------------- R1+R4+R R1+R4+R T T The X and Y total sheet resistance (Rxtot = R1+R2, Rytot = R3+R4) are known from the touch screen supplier. R4 is proportional to the Y coordinate and its value is given by the total Y plate resistance Rytot multiplied by the fraction of the Y position over the full coordinate range. Rev 1 – 25th July 2011 15 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Rxtot = R1+R2 Rytot = R3+R4 Ypos R4 = Rytot (cid:215) ------------- 4095 Re-arranging z1 and z2 gives: z2 z2 R = R4(cid:215) ------–1 T z1 This finally results in: Ypos z2 R = Rytot (cid:215) -------------(cid:215) ------– 1 T 4095 z1 The touch resistance calculation above hence requires three channel measurements (Ypos, z2 and z1) and one specification data (Rytot). An alternative calculation method is using Xpos, Ypos, one z channel and both Rxtot and Rytot as shown in the next calculations. R1 is inversely proportional to the X coordinate: Xpos R1 = Rxtot (cid:215) 1 – ------------- 4095 Substituting R1 and R4 into z1 and rearranging terms gives: Rytot (cid:215) Ypos 4095 Xpos R = --------------------------------- (cid:215) ------------ –1 – Rxtot (cid:215) 1 – ------------- T 4095 z1 4095 Please note that the chip only outputs z1, z2, etc. The calculation of R itself with the formulas above must be T performed by the host. 4.3.1 Bias Time (POWDLY) In order to perform correct measurements, some time must be given for the touch screen to reach a proper Vref bias level before the conversion is actually performed. It is a function of the PCB trace resistance connecting the chip to the touchscreen and also the capacitance of the touchscreen. If tau is this RC time constant, then POWDLY duration must be programmed to 10 tau to reach 12 bits accuracy. Adding a capacitor from the touch screen electrodes to ground may also be used to minimize external noise (if the touchscreen is used as the proximity sensor, make sure you do not exceed the maximum capacitive load for required for proper proximity sensing operation). The low-pass filter created with the capacitor may increase settling time requirement. Therefore, POWDLY can be used to stretch the acquisition period and delay conversion appropriately. POWDLY can be estimated by the following formula: PowDly = 10 · Rtouch · Ctouch 4.4 Pen Detection The pen detection circuitry is used both to detect a user action and generate an interrupt or start an acquisition in PENDET and PENTRG mode respectively. Doing pen detection prior to conversion avoids feeding the host with dummy data and saves power. Pen detection is also used to disable and resume proximity sensing. For more details on pen detection usage please refer to § 4.6. A 4-wire touchscreen will be powered between X+ and Y- through a resistor RPNDT so no current will flow as long as no pressure is applied to the surface (see figure below). When a touch occurs, a current path is created bringing X+ to the level defined by the resistive divider determined by RPNDT and the sum of R1, RT and R4. Rev 1 – 25th July 2011 16 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Figure 15 – 4-wire Touchscreen Pen Detection When using a 5-wire touchscreen, the pen detection pull-up resistor R and digital comparator continue to PNDT monitor the X+/BR pin as in 4-wire mode. The top panel is grounded via the WIPER pin to provide the grounding path for a screen touch event. When a touch occurs, a current path is created and will bring BR to the level defined by the resistive divider determined by R and the sum of R1, RT and RW. PNDT Figure 16 – 5-wire Touchscreen Pen Detection R can be configured to 4 different values to accommodate different screen resistive values. PNDT R should be set to a value greater than 7x(Rxtot + Rytot), it is recommended to set it to max value. PNDT Pen detection uses a bias time of POWDLY/8 (digital comparator => less precision required vs analog conversion). Increasing POWDLY can improve the detection on panels with high resistance. A pen touch will set the PENSTAT bit of the RegStat register which will generate an interrupt if enabled in RegIrqMsk. A pen release will reset PENSTAT bit of the RegStat register which will generate an interrupt if enabled in RegIrqMsk. 4.5 Digital Processing The chip offers 4 types of data processing which allows the user to make trade-offs between data throughput, power consumption and noise rejection. The parameter FILT is used to select the filter order Nfilt. The noise rejection will be improved with a high order to the detriment of power consumption. Each channel can be sampled up to 7 times and then processed to get a single consolidated coordinate. Rev 1 – 25th July 2011 17 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING c » 1 (cid:215) ∑N- 1s n N n- i i=0 Figure 17 – Digital Processing Block Diagram FILT Nfilt Function c = s n n 0 1 No average. 1 4079 c = ---(cid:215) ------------(s +s + s ) 1 3 n 3 4095 n n– 1 n –2 3 ADC samples are averaged. 1 4079 c = ---(cid:215) ------------(s +s + s +s + s ) 2 5 n 5 4095 n n– 1 n –2 n– 3 n –4 5 ADC samples are averaged. s ‡ s ‡ s‡ ‡ s ‡ s s‡ s max1 max2 a b c min1 min2 3 7 c = 1---(cid:215) 4---0---7---9---(s +s + s ) n 3 4095 a b c 7 ADC samples are sorted and the 3 center samples are averaged. Table 5 – Digital Processing Functions The parameter SETDLY sets the settling time between the consecutive conversions of the same channel. Figure 18 – POWDLY and SETDLY (FILT=2) In most applications, SETDLY can be set to minimum (0.5us). However, in some particular applications where an accuracy of 1LSB is required SETDLY may need to be increased. Rev 1 – 25th July 2011 18 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 4.6 Host Operation 4.6.1 Overview The chip has three operating modes that are configured using the I2C as defined in § 11 : (cid:2) Manual (command ‘MAN’ and TOUCHRATE = 0). (cid:2) Pen detect (command ‘PENDET’ and TOUCHRATE > 0). (cid:2) Pen trigger (command ‘PENTRG’ and TOUCHRATE > 0). At power-up the chip is set in manual mode. 4.6.2 Manual Mode (MAN) In manual mode (MAN) the touchscreen interface is stopped and conversions must be manually triggered by the host using SELECT and CONVERT command. When a command is received, the chip executes the associated tasks listed in table below and waits for the next command. It is up to the host to sequence all actions. Pen detection is performed after each CONVERT command and if pen is not detected, no touch operation is performed. Following figures assume pen down. PENSTAT is not updated in MAN mode. To enter MAN mode the host must send the MAN command and then set TOUCHRATE = 0. Command Actions CONVERT(CHAN) Select and bias CHAN Wait for the programmed settling time (POWDLY) Convert CHAN SELECT(CHAN) Select and bias CHAN Table 6 – Manual Mode Commands As illustrated in figure below the CONVERT command will bias the channel, wait for the programmed settling time (POWDLY), and run the conversion. I2C CONVERT(Y) READ CHANNEL Channel Bias Y POWDLY Channel Conversion Y CONVSTAT NIRQ (RegIrqMsk[3]=1) Figure 19 – Manual Mode – CONVERT Command (CHAN = Y; PROXSCANPERIOD = 0) When the CONVERT command is used with CHAN=SEQ, multiple channels as defined in RegChnMsk are sampled. In this case, each channel will be sequentially biased during POWDLY before a conversion is started. At the end of each channel conversion the bias is automatically removed. I2C CONVERT(SEQ) READ CHANNEL Channel Bias X Y POWDLY POWDLY Channel Conversion X Y CONVSTAT NIRQ (RegIrqMsk[3]=1) Figure 20 – Manual Mode – CONVERT Command (CHAN = SEQ = [X;Y]; PROXSCANPERIOD = 0) Rev 1 – 25th July 2011 19 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING In case the range of POWDLY settings available is not enough to cover the required settling time, one can use the SELECT command first to bias the channel, and then send the CONVERT command hence extending bias time. SELECT command cannot be used with CHAN=SEQ. I2C SELECT(Y) CONVERT(Y) READ CHANNEL Channel Bias Y POWDLY Channel Conversion Actual bias time Y CONVSTAT NIRQ (RegIrqMsk[3]=1) Figure 21 – Manual Mode – SELECT command (CHAN = Y; PROXSCANPERIOD = 0) At the end of the conversion(s) bit CONVSTAT will be reset which will trigger NIRQ falling edge (if enabled in RegIrqMsk). Host can then read channel data which will release NIRQ. Please note that when the SELECT command is used, the channel is converted whatever the pen status (no pen detection performed). 4.6.3 Pen Detect Mode (PENDET) In pen detect mode (PENDET) the chip will only run pen detection (continuously when pen is up, regularly as defined by TOUCHRATE when pen is down) and update PENSTAT bit in RegStat to be able to generate an interrupt (NIRQ) upon pen detection and/or release. No (touch) conversion is performed in this mode. To enter PENDET mode the host must set TOUCHRATE > 0 and then send PENDET command. To quit PENDET mode and stop the touchscreen interface the host must enter MAN mode. Pen Touch Pen Release TOUCHRATE tick PENSTAT CONVSTAT NIRQ I2C Read RegIrqSrc Idle Pen Detection Figure 22 – Pen Detect Mode (RegIrqMsk[3:2] = 11 ; PROXSCANPERIOD = 0) Please note that the next pen detection is not performed as long as NIRQ is low. If the host is too slow and doesn’t read IrqSrc before next TOUCHRATE tick, no operation is performed and this TOUCHRATE tick is simply ignored until next one. 4.6.4 Pen Trigger Mode (PENTRG) In pen trigger mode (PENTRG) the chip will perform pen detection (continuously when pen is up, regularly as defined by TOUCHRATE when pen is down) and if pen is down, will be followed by a conversion as defined in RegChanMsk. The chip will update CONVSTAT bit in RegStat and will be able to generate an interrupt (NIRQ) upon conversion completion. The chip will also update PENSTAT bit in RegStat and will be able to generate an interrupt (NIRQ) upon pen detection and/or release. The PENTRG mode offers the best compromise between power consumption and coordinate throughput. To enter PENTRG mode the host must set TOUCHRATE > 0 and then send PENTRG command. To quit PENTRG mode and stop the touchscreen interface the host must enter MAN mode. Rev 1 – 25th July 2011 20 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Pen Touch Pen Release TOUCHRATE tick PENSTAT CONVSTAT NIRQ I2C Read Channel Idle Touch Conversion Pen Detection Figure 23 – Pen Trigger Mode (RegIrqMsk[3:2] = 10 ; PROXSCANPERIOD = 0) Please note that to prevent data loss, the next pen detection and conversion are not performed as long as all current channel data (i.e. channels selected in RegChanMsk) have not been read. If the host is too slow and doesn’t read all channel data before next TOUCHRATE tick, no operation is performed and this TOUCHRATE tick is simply ignored until next one. 4.6.5 Maximum Throughput vs. TOUCHRATE setting In PENTRG mode the TOUCHRATE parameter is used to define the required coordinate’s throughput/rate. However, as previously mentioned, in order for a new conversion to be performed the current conversion must be completed and all relevant channel data must have been read by the host. If this condition is not met when the next TOUCHRATE tick occurs, the tick is ignored and the condition checked again at the next one. This will result in reduced actual rate vs what has been programmed in the TOUCHRATE parameter. This is illustrated in figures below. TOUCHRATE tick NIRQ I2C Read Channel Tconv Tcom Tconv+Tcom < Trate Trate = => Actual rate = TOUCHRATE Idle Pen Detection Touch Conversion Figure 24 – Correct TOUCHRATE setting Rev 1 – 25th July 2011 21 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Not ready, tick ignored TOUCHRATE tick NIRQ I2C Read Channel Trate < Tconv+Tcom < n.Trate Tconv Tcom => Actual rate = TOUCHRATE/n Trate = Idle Pen Detection Touch Conversion Figure 25 – Incorrect (too high) TOUCHRATE setting In order to prevent this, one can estimate the maximum throughput achievable and set TOUCHRATE parameter accordingly. MaxThroughput = 1 / (Tconv+Tcom) Tcom is the time between the end of conversion (ie NIRQ falling edge) and the end of channel data reading (i.e. NIRQ rising edge). Maximum throughput implies that the host reacts “instantaneously” to NIRQ falling edge: T = (8+16· N )· T com chan I2C Tconv is the total conversion time: Tconv(us) = 47(cid:215) Tosc+N (cid:215) (POWDLY+(N –1)(cid:215) SETDLY+(21N +1)(cid:215) Tosc) chan filt filt - T is the period of the I2C clock SCL I2C - N = {1,3,5,7} based on the order defined for the filter FILT filt - N = {1,2,3,4,5} based on the number of channels defined in RegChanMsk chan - POWDLY = 0.5us to 18.19ms, settling time as defined in RegTS0 - SETDLY = 0.5us to 18.19ms, settling time when filtering as defined in RegTS2 - Tosc is the period of the internal oscillator FOSCH Some examples of maximum throughputs achievable with an I2C running at 400kHz are given below. POWDLY SETDLY Tconv Tcom Total CR ECR SR ESR Nchan Nfilt [us] [us] [us] [us] [us] [kcps] [kcps] [ksps] [ksps] 2 1 0.5 0.5 51.7 100 151.7 6.6 13.2 6.6 13.2 2 3 35.5 0.5 170.6 100 270.6 3.7 7.4 11.1 22.2 2 5 2.2 0.5 152.8 100 252.8 4 8 20 40 4 3 35.5 0.5 315.0 200 515 1.9 7.6 5.7 22.8 Table 7 – Maximum Throughputs Examples - CR = Coordinate Rate - ECR = Equivalent Coordinate Rate = CR x N chan - SR = Sampling Rate = CR x N filt - ESR = Equivalent Sampling Rate = SR x N = CR x N x N chan filt chan For proper operation, the TOUCHRATE parameter should not exceed the theoretical maximum throughput CR. Rev 1 – 25th July 2011 22 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 5 PROXIMITY SENSING INTERFACE (SX8654/56) 5.1 Introduction The purpose of the proximity sensing interface is to detect when a conductive object (usually a body part i.e. finger, palm, face, etc) is in the proximity of the system. This is commonly used in power-sensitive mobile applications to turn the screen’s LCD ON/OFF depending on user’s finger/palm/face proximity. The chip’s proximity sensing interface is based on capacitive sensing technology and shares the ADC with the touchscreen interface (Cf § 5.4.2). An overview is given in figure below. Finger, palm, face, etc Sensor Analog Digital PROXSTAT Front-End Processing Shield (AFE) 0 1 0 SX8654/56 Figure 26 – Proximity Sensing Interface Overview (cid:3) The sensor can be the top layer of the touchscreen or a simple copper area on the PCB (programmable in PROXSENSORCON). Its capacitance (to ground) will vary when a conductive object is moving in its proximity. (cid:3) The optional shield can be the bottom layer of the touchscreen or a simple copper area on the PCB (programmable in PROXSHIELDCON) below/under/around the sensor. It is used to protect the sensor against potential surrounding noise sources and improve its global performance. It also brings directivity to the sensing, for example sensing objects approaching from top only. (cid:3) The analog front-end (AFE) performs the raw sensor’s capacitance measurement and converts it into a 12 bit digital code. It also controls the shield. See § 5.2 for more details. (cid:3) The digital processing block computes the raw capacitance measurement from the AFE and extracts a binary information PROXSTAT corresponding to the proximity status, i.e. object is “Far” or “Close”. It also triggers AFE operations (compensation, etc). See § 5.3 for more details. To save power since the proximity event is slow by nature, the block will be waken-up regularly at every programmed scan period (PROXSCANPERIOD) to sense and then process a new proximity sample. The block will be in idle mode most of the time. This is illustrated in figure below Figure 27 – Proximity Sensing Sequencing Rev 1 – 25th July 2011 23 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 5.2 Analog Front-End (AFE) 5.2.1 Capacitive Sensing Basics Capacitive sensing is the art of measuring a small variation of capacitance in a noisy environment. As mentioned above, the chip’s proximity sensing interface is based on capacitive sensing technology. In order to illustrate some of the user choices and compromises required when using this technology it is useful to understand its basic principles. To illustrate the principle of capacitive sensing we will use the simplest implementation where the sensor is a copper plate on a PCB but the exact same principles apply if the sensor is the touchscreen’s top plate. The figure below shows a cross-section and top view of a typical capacitive sensing implementation. The sensor connected to the chip is a simple copper area on top layer of the PCB. It is usually surrounded (shielded) by ground for noise immunity (shield function) but also indirectly couples via the grounds areas of the rest of the system (PCB ground traces/planes, housing, etc). For obvious reasons (design, isolation, robustness …) the sensor is stacked behind an overlay which is usually integrated in the housing of the complete system. When the touchscreen is used for sensing the overlay corresponds to the thin and flexible protection film covering the top panel. Overlay PCB copper Cut view PCB dielectric Sensor Top view Ground Figure 28 – Typical Capacitive Sensing Implementation When the conductive object to be detected (finger/palm/face, etc) is not present, the sensor only sees an inherent capacitance value C created by its electrical field’s interaction with the environment, in particular Env with ground areas. When the conductive object (finger/palm/face, etc) approaches, the electrical field around the sensor will be modified and the total capacitance seen by the sensor increased by the user capacitance C . This User phenomenon is illustrated in the figure below. Figure 29 – Proximity Effect on Electrical Field and Sensor Capacitance Rev 1 – 25th July 2011 24 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING The challenge of capacitive sensing is to detect this relatively small variation of C (C usually contributes Sensor User for a few percents only) and differentiate it from environmental noise (C also slowly varies together with the Env environment characteristics like temperature, etc). For this purpose, the chip integrates an auto offset compensation mechanism which dynamically monitors and removes the C component to extract and process Env C only. See § 5.2.5 for more details. User In first order, C can be estimated by the formula below: User ε (cid:215) ε (cid:215) A C = 0 r User d A is the common area between the two electrodes hence the common area between the user’s finger/palm/face and the sensor. d is the distance between the two electrodes hence the proximity distance between the user and the system. ε is the free space permittivity and is equal to 8.85 10e-12 F/m (constant) 0 ε r is the dielectric relative permittivity. When performing proximity sensing the dielectric relative permittivity is roughly equal to that of the air as the overlay is relatively thin compared to the detection distance targeted. Typical permittivity of some common materials is given in the table below. ε Material Typical r Glass 8 FR4 5 Acrylic Glass 3 Wood 2 Air 1 From the discussions above we can conclude that the most robust and efficient design will be the one that minimizes C value and variations while improving C . Env User 5.2.2 AFE Block Diagram Figure 30 – Analog Front-End Block Diagram Rev 1 – 25th July 2011 25 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 5.2.3 Capacitance-to-Voltage Conversion (C-to-V) PROXSENSORCON defines which pin will act as the sensor during proximity sensing operations. In the typical case, the touchscreen top layer is used as the sensor (exact pin/electrode depends on screen type/structure). Else, the sensor can also be “external”, i.e. connected to AUX2. The sensitivity of the interface is defined by PROXSENSITIVITY; for obvious power consumption reasons it is recommended to set it as low as possible. As a last resort and only if the sensor is “external”, PROXBOOST can be set to allow higher sensitivity if needed. PROXFREQ defines the operating frequency of the interface and should be set as high as possible for power consumption reasons. If needed, PROXHIGHIM enables a high noise immunity mode at the expense of increased power consumption. 5.2.4 Shield Control PROXSHIELDCON defines which pin will act as the shield during proximity sensing operations. In the typical case, the shield will usually be the touchscreen bottom layer (exact pin/electrode depends on screen type/structure). Else, the shield can also be “external”, ie a simple copper area on the PCB connected to AUX3. 5.2.5 Offset Compensation Offset compensation consists in performing a one time measurement of C and subtracting it to the total Env capacitance C in order to feed the ADC with the closest contribution of C only. Sensor User Figure 31 – Offset Compensation Block Diagram The ADC input C is the total capacitance C to which C is subtracted. User Sensor Env There are five possible compensation sources which are illustrated in the figure below. When set to 1 by any of these sources, PROXCOMPSTAT will only be reset once the compensation is completed. Figure 32 – Compensation Request Sources Rev 1 – 25th July 2011 26 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING (cid:4) Block startup: a compensation is automatically requested when the proximity sensing is enabled via PROXSCANPERIOD. (cid:4) I2C: a compensation can be manually requested anytime by the host through I2C interface. (cid:4) PROXAVG update: a compensation can be automatically requested if it is detected that C has drifted Env beyond a set level since the last compensation. (cid:4) PROXCOMPPRD: a compensation can be automatically requested at a predefined rate programmed by the host. (cid:4) PROXSTUCK: a compensation can be automatically requested if it is detected that the proximity “Close” state is lasting abnormally long. Please note that the compensation request flag can be set anytime but the compensation itself is always done at the beginning of a scan period to keep all parameters coherent (PROXRAW, PROXAVG, PROXDIFF), see § 5.3.2. 5.2.6 Analog-to-Digital Conversion (ADC) A 12-bit ADC is used to convert the capacitance information into a digital 12-bit word PROXRAW. The ADC is shared with the touchscreen interface using time multiplexing (see § 5.4.2 for more details). 5.3 Digital Processing 5.3.1 Overview The main purpose of the digital processing block is to convert the raw capacitance information coming from the AFE (PROXRAW) into a robust and reliable digital flag (PROXSTAT) indicating if the user’s finger/hand/head is close to the proximity sensor. The offset compensation performed in the AFE is a one time measurement. However, the environment capacitance C may vary with time (temperature, nearby objects, etc). Hence, in order to get the best Env estimation of C (PROXDIFF) it is needed to dynamically track and subtract C variations. This is performed User Env by filtering PROXUSEFUL to extract its slow variations (PROXAVG). PROXDIFF is then compared to user programmable threshold to extract PROXSTAT flag. Figure 33 – Digital Processing Block Diagram Digital processing sequencing is illustrated in figure below. At every scan period wake-up (defined by PROXSCANPERIOD), the block updates sequentially PROXRAW, PROXUSEFUL, PROXAVG, PROXDIFF and PROXSTAT before going back to Idle mode. Rev 1 – 25th July 2011 27 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Figure 34 – Digital Processing Sequencing Digital processing block also updates CONVSTAT (set during proximity operations) and PROXCOMPSTAT (set when compensation is currently pending execution or competition) 5.3.2 PROXRAW Update PROXRAW update consists mainly in starting the AFE and waiting for the new PROXRAW value to be ready. If a compensation was pending it is performed first. Rev 1 – 25th July 2011 28 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Figure 35 – ProxRaw Update 5.3.3 PROXUSEFUL Update PROXUSEFUL update consists in filtering PROXRAW upfront to remove its potential high frequencies components(system noise, interferer, etc) and extract only user activity (few Hz max) and slow environment changes. Figure 36 – PROXUSEFUL Update F(PROXRAW ; PROXUSEFUL[n-1] ; PROXRAWFILT) = (1 - PROXRAWFILT).PROXRAW + PROXRAWFILT.PROXUSEFUL[n-1] Rev 1 – 25th July 2011 29 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 5.3.4 PROXAVG Update PROXAVG update consists in averaging PROXUSEFUL to ignore its “fast” variations (i.e. user finger/palm/hand) and extract only the very slow variations of environment capacitance C . Env One can program positive and negative debounced thresholds (PROXAVGPOSTHRESH/PROXAVGPOSDEB and PROXAVGNEGTHRESH/PROXAVGNEGDEB) within which PROXAVG can vary without triggering compensation (ie small acceptable environment drift). Large positive values of PROXUSEFUL are considered as normal (user finger/hand/head) but large negative values are considered abnormal and should be compensated quickly. For this purpose, the averaging filter coefficient can be set independently for positive and negative variations via PROXAVGPOSFILT and PROXAVGNEGFILT. Typically we have PROXAVGPOSFILT > PROXAVGNEGFILT to filter out (abnormal) negative events faster. To prevent PROXAVG to be “corrupted” by user activity (should only reflect environmental changes) it is freezes when proximity is detected. Figure 37 – ProxAvg vs Proximity Event Rev 1 – 25th July 2011 30 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Figure 38 – ProxAvg Update F(PROXUSEFUL ; PROXAVG[n-1] ; PROXAVGxxxFILT) = (1 - PROXAVGxxxFILT).PROXUSEFUL + PROXAVGxxxFILT.PROXAVG[n-1] xxx = POS or NEG Rev 1 – 25th July 2011 31 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 5.3.5 PROXDIFF Update PROXDIFF update consists in the complementary operation i.e. subtracting PROXAVG to PROXUSEFUL to ignore slow capacitances variations (C ) and extract only the user related variations i.e. C . Env User Figure 39 – ProxDiff Update 5.3.6 PROXSTAT Update PROXSTAT update consists in taking PROXDIFF information (C ), comparing it with a user programmable User threshold PROXTHRESH and finally updating PROXSTAT accordingly. When PROXSTAT=1, PROXAVG is frozen to prevent the user proximity signal averaging and hence absorbed into C . Env Figure 40 – PROXSTAT Update Rev 1 – 25th July 2011 32 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 5.4 Host Operation 5.4.1 General Description If PROXIRQSEL = 0, an interrupt can be triggered when the user is detected to be close, detected to be far, or both (PROXCLOSEIRQEN, PROXFARIRQEN). User in range User out of range PROXSCANPERIOD tick PROXSTAT CONVSTAT NIRQ I2C Read RegIrqSrc Pen Detection Proximity Sensing (Analog + Digital) Figure 41 – Proximity Sensing Host Operation (Pen Trigger Mode ; RegIrqMsk[6:4] = 110 ; PROXIRQSEL = 0) If PROXIRQSEL = 1, instead of the proximity “Far” state, an interrupt can be triggered at the end of each proximity sensing operation indicating to the host when the proximity sensing block is running (PROXCONVDONEIRQEN). This may be used by the host to synchronize noisy system operations or to read PROXRAW, PROXUSEFUL, PROXAVG, PROXDIFF synchronously for monitoring purposes. User in range User out of range PROXSCANPERIOD tick PROXSTAT CONVSTAT NIRQ I2C Read RegIrqSrc Pen Detection Proximity Sensing (Analog + Digital) Figure 42 – Proximity Sensing Host Operation (Pen Trigger Mode ; RegIrqMsk[6:4] = 010 ; PROXIRQSEL = 1) In both cases above, an interrupt can also be triggered at the end of compensation (PROXCOMPDONEEN). 5.4.2 Proximity Sensing vs Touch Operations As previously mentioned, touch and proximity operations share the same ADC and hence the chip implements time multiplexing between these two types of operations. Also, proximity sensing doesn’t need to be performed while pen is down (not needed as host knows already something touches the screen). In all operating modes, if PROXSCANPERIOD = 0, no proximity operation is performed (i.e. § 4.6). The following hence assumes PROXSCANPERIOD != 0. For simplicity we also assume that NIRQ is only used for reporting touch operations i.e. RegIrqMsk[6:4] = 000 (PROXSTAT mapped to AUX pin, or polled via I2C). In MAN mode, a CONVERT command (if not preceded by a SELECT command) will perform a proximity sensing operation before the touchscreen operation, whatever the pen status. Hence please note that if the Rev 1 – 25th July 2011 33 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING touchscreen is used as the proximity sensor and is being touched when the conversion is performed, the proximity measurement result may be incorrect. I2C CONVERT Y READ CHANNEL C hannel Bias Y POWDLY Channel Conve rsion PROX Y CONVSTAT NIRQ ( RegIrqMsk[6:3]=0001) Figure 43 – Manual Mode – CONVERT Command (CHAN = Y ; PROXSCANPERIOD != 0; Pen down) If the screen is not touched, only the proximity sensing operation is performed. I2C CONVERT Y READ CHANNEL C hannel Bias Channel Conve rsion PROX CONVSTAT NIRQ ( RegIrqMsk[6:3]=0001) Figure 44 – Manual Mode – CONVERT Command (CHAN = Y ; PROXSCANPERIOD != 0, Pen up) In PENDET and PENTRG mode, a proximity sensing operation will be performed regularly as defined in PROXSCANPERIOD, but only if pen is not detected. Pen Touch Pen Release TOUCHRATE tick P ENSTAT CONVSTAT NIRQ I2C Read RegIrqSrc Idle Touch Conversion Pen Detection Proximity Sensing Figure 45 – Pen Detect Mode (RegIrqMsk[6:2] = 00011 ; PROXSCANPERIOD = 001 ie 1/TOUCHRATE) Rev 1 – 25th July 2011 34 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Pen Touch Pen Release TOUCHRATE tick PENSTAT CONVSTAT NIRQ I2C Read Channel Idle Touch Conversion Pen Detection Proximity Sensing Figure 46 – Pen Trigger Mode (RegIrqMsk[6:2] = 00010 ; PROXSCANPERIOD = 001 ie 1/TOUCHRATE) 5.4.3 Minimum Scan Period (i.e. PROXSCANPERIOD) Similarly to touch operations (Cf. § 4.6.5), if PROXSCANPERIOD is too short for proximity sensing operations to be completed, the rate tick(s) affected are ignored until operations are completed and the following tick is taken into account for the next planned operation. Please note that compensation lasts about ~16 times longer than a normal proximity sensing operation. Rev 1 – 25th July 2011 35 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 6 HAPTICS INTERFACE (SX8654/55) 6.1 Introduction Haptics technology is commonly used in systems which include a touchscreen interface. Its purpose is to provide tactile feedback to the user to acknowledge a touch event hence improving greatly the robustness of the system and user comfort and perception. The on-chip haptics interface is designed to drive two common actuator types: Eccentric Rotating Mass (ERM) and Linear Resonant Actuator (LRA). This is performed without any external component due to fully embedded analog processing and with very limited host interaction due to the embedded digital processing block. Figure 47 – Haptics Interface Overview The host configures drive parameters from the I2C port according to the particular haptics load to be used. The haptics drive level is then controlled in real time by either of two methods: by a dedicated digital pin, MIN, which accepts a pulse-width-modulated (PWM) digital signal; or by writing the desired output level directly to a register via the I2C interface. This digital information is filtered to prevent fast transitions and hence high current spikes (HAPTBW), converted into the analog domain by an 8-bit DAC, and finally amplified (HAPTGAIN) to provide a differential signal between MOUTP and MOUTN pins which can be directly connected to the motor thanks to their high drive current capability. For better isolation from the rest of the chip, the haptics interface analog block has its own power supply pins MVDD and MGND. The haptics interface is enabled when HAPTTYPEEN != 0. 6.2 ERM Load 6.2.1 Introduction An ERM is a DC motor with an off-balance load to create a vibration. Speed and direction are controlled by the applied voltage. The ERM load is selected when HAPTTYPEEN = 10. Rev 1 – 25th July 2011 36 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Accelerating Figure 48 – ERM Drive Signal Example If AmplitudeCode is within HAPTSQUELCH range (for more than 512/MIN_Freq in PWM mode, for more than 512/FOSCL in I2C mode): VMOUT = 0V Else: VMOUT(V) = (AmplitudeCode / 127) x 1.135 * HAPTGAIN AmplitudeCode (signed) is defined differently depending on the mode selected (PWM or I2C), see below. Please note that whatever setting, VMOUT is physically limited to [MVDD;-MVDD], i.e. saturation effect. 6.2.2 PWM Mode PWM mode is selected when HAPTMODE = 0. In this mode, AmplitudeCode is extracted/updated at each MIN period from MIN_DutyCycle: • MIN_DutyCycle ≈ 0% => AmplitudeCode = -127 • … • MIN_DutyCycle = 49.6% => AmplitudeCode = -1 • MIN_DutyCycle = 50% => AmplitudeCode = 0 • MIN_DutyCycle = 50.4% => AmplitudeCode = +1 • … • MIN_DutyCycle ≈ 100% => AmplitudeCode = +127 6.2.3 I2C Mode I2C mode is selected when HAPTMODE = 1. In this mode, AmplitudeCode = HAPTAMP (signed, internally sampled at FOSCL). MIN is not used and should be grounded. HAPTRANGE must be set to 1. 6.3 LRA Load 6.3.1 Introduction An LRA is a spring and mass with an electro-magnetic coil to move the mass. It is operated by applying an AC signal at its resonant frequency (typ. ~175 Hz). Like pushing a swing at its resonance, it doesn’t need much energy to keep it going, so drive current requirements are much lower than for ERMs. LRAs have moderately high Q factors so that the drive frequency must match the resonant frequency within a few Hz to get optimum amplitude. LRA load is selected when HAPTTYPEEN = 01. Rev 1 – 25th July 2011 37 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Figure 49 – LRA Drive Signal Example The carrier frequency of VMOUT_Freq is defined as following: VMOUT_Freq(Hz) = (MIN_Freq / HAPTRANGE) (PWM mode) OR VMOUT_Freq(Hz) = (MIN_Freq / HAPTRANGE) / (HAPTTIMER +1) (I2C mode) If AmplitudeCode is within HAPTSQUELCH range (for more than 512/VMOUT_Freq): VMOUT_Envelope = 0V Else: VMOUT_Envelope(V) = (AmplitudeCode / 127) x 1.135 * HAPTGAIN AmplitudeCode (signed) is defined differently depending on the mode selected (PWM or I2C), see below. Please note that whatever setting, VMOUT is physically limited to [MVDD;-MVDD], ie saturation effect. 6.3.2 PWM Mode PWM mode is selected when HAPTMODE = 0. In this mode, AmplitudeCode is extracted/updated at each MIN period from MIN_DutyCycle: • MIN_DutyCycle ≈ 0% => AmplitudeCode = -127 • … • MIN_DutyCycle = 49.6% => AmplitudeCode = -1 • MIN_DutyCycle = 50% => AmplitudeCode = 0 • MIN_DutyCycle = 50.4% => AmplitudeCode = +1 • … • MIN_DutyCycle ≈ 100% => AmplitudeCode = +127 6.3.3 I2C Mode I2C mode is selected when HAPTMODE = 1. In this mode, AmplitudeCode = HAPTAMP (signed, internally sampled at MIN_Freq). MIN is still used to extract VMOUT carrier frequency. 6.4 Short-Circuit Protection The haptics interface integrates a short-circuit protection circuit which detects when MIDD is abnormally high i.e. above ISHORT. Under a short-circuit event (HAPTSHORTSTAT=1) the haptics block will stop operation (MOUTN & MOUTP grounded). When the short-circuit is removed the haptics operations will resume normally. Rev 1 – 25th July 2011 38 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 7 TEMPERATURE SENSOR The chip includes a temperature sensor which monitors the chip’s junction temperature. Its purpose is to provide over-temperature information to the host and if needed automatically shutdown chip operation for thermal protection. Figure 50 – Temperature Sensor Overview If TEMPALWAYSON = 0 (default), the temperature sensor will perform measurements only if the chip is active i.e. touchscreen interface running (Op. Mode != MAN), proximity sensing interface enabled (PROXSCANPERIOD != 0) or haptics interface enabled (HAPTTYPEEN != 00). The temperature sensor will perform a measurement every ~32 ms (1024/FOSCL) but not during ADC conversions (temperature sensing delayed accordingly). If TEMPALWAYSON = 1, the temperature sensor will always perform a measurement every ~32 ms independently from chip activity (i.e. also when the chip is inactive and during ADC conversions). Each measurement is compared with two internally hard-coded thresholds: (cid:2) Warning level: typ. 120°C (TWRNG). (cid:2) Alarm level: typ. 155°C (TALRM) Each of these thresholds is associated to a status flag (TEMPWARNINGSTAT, TEMPALARMSTAT) which edges can be mapped to generate an interrupt to the host. Additionally, during an alarm situation (i.e. temperature > alarm level) all chip operations (i.e. touchscreen, proximity, haptics) are automatically shutdown until the temperature goes below the alarm level. After a shutdown event all stored conversion data are thrown away. Cycling operations (TOUCHRATE > 0) will resume from the start (i.e. if a 4 channel conversion is stopped during the 3rd channel conversion, when resuming, the 4 channels will be converted again). If the user was running some manual operation (SELECT, CONVERT), the corresponding command will have to be re-issued. The haptics operations will resume directly. Rev 1 – 25th July 2011 39 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 8 INTERRUPT (NIRQ) 8.1 Introduction The purpose of the NIRQ pin is to indicate to the host (via a falling edge) when any of the events considered being time-critical has occurred. Non time-critical events can be monitored via I2C by reading regularly the relevant status bits. 8.2 Registers Overview 8.2.1 RegIrqMsk This register allows the host to decide which interrupt sources he wants to monitor via the NIRQ signal. Please note that a reset event will always trigger NIRQ falling edge whatever RegIrqMsk (Cf § 10) 8.2.2 RegIrqSrc This register indicates to the host which of the interrupt sources triggered the NIRQ signal. More than one bit can be set if several events occurred before host reads the register. If bit 3 is OFF, reading the register will clear it together with releasing NIRQ signal. Else, if bit 3 is ON and we are in MAN or PENTRG mode, both register and NIRQ will be cleared only once all channel data have been read. All ADC related operations (touch conversion, proximity conversion, pen detection) are stopped as long as all channel data have not been read. Bits which RegIrqMsk corresponding bits are set to 0 (ie source not monitored) will always read 0 even if the event actually occurred. 8.2.3 RegStat This register regroups all status information of the chip and is used by all interrupt sources to detect the relevant events. For each bit, if the relevant block is ON its value is constantly updated, else it is set to 0. This register update is completely independent from RegIrqMsk. 8.3 Host Procedure - Configure the different blocks parameters(TS, Proximity, etc) - Program RegIrqMsk to start monitoring what is considered to be “time-critical” events - Enable the blocks to start RegStat update and hence NIRQ process. - Each time NIRQ falling edge occurs, read RegIrqSrc to know which “time-critical” event occurred (+ read channel data if relevant) - In addition, RegStat can be read anytime to get the whole picture including also what is considered to be “non time-critical” information. Rev 1 – 25th July 2011 40 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 9 AUXILIARY PINS (AUX1/AUX2/AUX3) The chip has three auxiliary pins which can be used: 1. By the touchscreen interface when using a 5-wire touchscreen (WIPER=AUX1) 2. By the proximity sensing interface (PROXSENSORCON and PROXSHIELDCON) to use an external sensor and/or shield instead of the touchscreen’s plates 3. By the host (RegAux0-1) to monitor any RegStat and/or RegIrqSrc bits in real time without having to use NIRQ or perform I2C polling. Rev 1 – 25th July 2011 41 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 10 RESET 10.1 Hardware (POR and NRST) The chip generates its own power on reset (POR) signal after a power supply is connected to the VDD pin. NRST input pin can be used to reset the chip anytime, it must be connected to VDD (or greater) either directly (if not used), or via a resistor. 1 2 3 VDD VPOR Reset Signal Undefined t t RESET PULSE NIRQ Undefined Figure 51 – Hardware Reset Conditions 1. Device behavior is undefined until VDD rises above VPOR, at which point internal reset procedure is started and NIRQ is kept low. 2. After t , the reset procedure is completed and NIRQ is released high. RESET 3. In operation, the chip may be reset at anytime by an external device driving NRST low for t or PULSE longer. NIRQ will go low during the reset phase and chip can be accessed normally again after NIRQ rising edge. Additionally bit RESETSTAT will be set (cleared when reading RegStat) 10.2 Software (RegReset) Writing 0xDE to RegReset register will reset the chip and all registers to their default values. NIRQ will go low during the reset phase and chip can be accessed normally again after NIRQ rising edge. Additionally bit RESETSTAT will be set (cleared when reading RegStat). 10.3 ESD Event (RESETSTAT) In case of ESD event, the chip can reset to protect its internal circuitry. NIRQ will go low during the reset phase and chip can be accessed normally again after NIRQ rising edge. Additionally bit RESETSTAT will be set (cleared when reading RegStat). Rev 1 – 25th July 2011 42 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 11 I2C INTERFACE 11.1 Introduction The chip is a read-write slave-mode I2C device and complies with the Philips I2C standard Version 2.1 dated January, 2000. The chip has a few user-accessible internal 8-bits registers to set the various parameters of operation (Cf. § 12 for detailed configuration registers description). The I2C interface has been designed for program flexibility, in that once the slave address has been sent to the chip enabling it to be a slave transmitter/receiver, any register can be written or read independently of each other. The start and stop commands frame the data-packet and the repeat start condition is allowed if necessary. 2 lines are used to exchange data between an external master host and the slave device: • SCL : Serial CLock • SDA : Serial DAta Seven bit addressing is used and ten bit addressing is not allowed. Any general call address will be ignored by the chip. The chip is not CBUS compatible and can operate in standard mode (100kbit/s) or fast mode (400kbit/s). 11.2 I2C Address On the QFN package an ADDR pin is made available to select between the two pre-programmed I2C addresses of the device. On the CSP package ADDR is internally connected to ground. This is illustrated in table below. Package ADDR Address Description 0 0x48 (1001000) First I2C address QFN 1 0x49 (1001001) Second I2C address CSP 0 0x48 (1001000) First (and unique) I2C address Table 8 – I2C Address Please note that upon request, a custom I2C Address can be pre-programmed by Semtech. 11.3 Write Register The I2C write register sequence is given in figure below. After the start condition [S], the chip slave address (SA) is sent, followed by an eighth bit (W=‘0’) indicating a write. The chip then acknowledges [A] that it is being addressed, and the host sends a CR byte consisting in ‘00’ followed by the chip register address (RA). The chip acknowledges [A] and the host sends the appropriate data byte (WD0) to be written. Again the chip acknowledges [A]. In case the host needs to write more data, a succeeding data byte will follow (WD1), acknowledged by the slave [A]. This sequence will be repeated until the host terminates the transfer with the stop condition [P]. Figure 52 – I2C Write Register The register address increments automatically when successive data bytes (WD1...WDn) are supplied by the host. Rev 1 – 25th July 2011 43 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING The correct sampling of the screen by the chip and the host I2C bus traffic are events that might occur simultaneously. The chip will synchronize these events by the use of clock stretching if that is required. The stretching occurs directly after the last received command bit (see figure above). 11.4 Read Register The I2C read register sequence is given in figure below. After the start condition [S], the chip slave address (SA) is sent, followed by an eighth bit (W=‘0’) indicating a write. The chip then acknowledges [A] that it is being addressed, and the host responds with a CR byte consisting in ‘01’ followed by the register address (RA). The chip acknowledges [A] and the host sends the repeated start Condition [Sr]. Once again, the chip slave address (SA) is sent, followed by an eighth bit (R=‘1’) indicating a read. The chip responds with an acknowledge [A] and the data byte (RD0). If the host needs to read more data it will acknowledge [A] and the chip will send the next data byte (RD1). This sequence will be repeated until the host terminates the transfer with a NACK [N] followed by a stop condition [P]. Figure 53 – I2C Read Register The register address increments automatically when successive data bytes (RD1...RDn) are read by the host. The correct sampling of the screen by the chip and the host I2C bus traffic are events that might occur simultaneously. The chip will synchronize these events by the use of clock stretching if that is required. The stretching occurs directly after the last received command bit (see figure above). 11.5 Write Command (Touchscreen Interface) The I2C write command sequence is given in figure below. After the start condition [S], the chip slave address (SA) is sent, followed by an eighth bit (W=‘0’) indicating a write. The chip then acknowledges [A] that it is being addressed, and the host responds with a CR byte consisting in Command(7:0) (see table below). The chip acknowledges [A] and the host sends a stop [P]. Figure 54 – I2C Write Command The sampling of the screen by the chip and the host I2C bus traffic are events that might occur simultaneously. The chip will synchronize these events by the use of clock stretching if that is required. The stretching occurs directly after the last received command bit (see figure above). Rev 1 – 25th July 2011 44 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Command Command(7:0) Function SELECT 1 0 1 0 X Chan(2:0) Select and bias channel. CONVERT 1 0 1 1 X Chan(2:0) Convert channel. MAN 1 1 0 0 X X X X Enter manual mode. PENDET 1 1 0 1 X X X X Enter pen detect mode. PENTRG 1 1 1 0 X X X X Enter pen trigger mode. Table 9 : Command Codes Channel Chan(2:0) Description X 0 0 0 X channel Y 0 0 1 Y channel Z1 0 1 0 First channel for pressure measurement Z2 0 1 1 Second channel for pressure measurement SEQ 1 1 1 Channels enabled in RegChanMsk register Table 10 : Channel Codes 11.6 Read Channel (Touchscreen Interface) The I2C read channel sequence is given in figure below. After the start condition [S], the chip slave address (SA) is sent, followed by an eighth bit (R=‘1’) indicating a read. The chip responds with an acknowledge [A] and the first data byte (RD0). The host sends an acknowledge [A] and the chip responds with the second data byte (RD1). If the host needs to read more channels, it will acknowledge [A] and the chip will send the next data bytes. This sequence will be repeated until the host terminates with a NACK [N] followed immediately by a stop [P]. The channel data that can be read is defined by RegChanMsk, or the last convert command in manual mode. A maximum number of 8 data bytes can be read when all channels (X, Y, Z1, Z2) are activated in RegChanMsk. The STOP [P] (if following the last valid data) releases high the NIRQ line. All ADC related operations (touch conversion, proximity conversion, pen detection) are stopped as long as all valid channel data have not been read (ie as long as NIRQ is low). Figure 55 – I2C Read Channel The sampling of the screen by the chip and the host I2C bus traffic are events that might occur simultaneously. The chip will synchronize these events by the use of clock stretching if that is required. The stretching occurs directly after the address and read bit have been sent for the I2C read channels command (see figure above). The channel data is sent with the following order: X, Y, Z1, Z2. It is coded as described in figure below Typical applications require only X and Y coordinates, thus only 4 bytes of data will be read in this case. 0 CHAN(2:0) D(11:8) D(7:0) RD0 RD1 Figure 56 – Channel Data Format Rev 1 – 25th July 2011 45 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING The 3 bits CHAN(2:0) are defined in the previous table and show which channel data is referenced. The channel data D(11:0) is of unsigned format and corresponds to a value between 0 and 4095. The chip will return 0xFFFF in case of invalid data; this occurs when: • host tries to read channels which have not been converted. For example if the chip converts X and Y and the host tries to read X, Y, Z1 and Z2. • a conversion has been done while the screen wasn’t touched , i.e. pen up (not detected). Rev 1 – 25th July 2011 46 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 12 REGISTERS DETAILED DESCRIPTION Address Name Default Description 0x00 RegTouch0 0x00 0x01 RegTouch1 0x20 0x02 RegTouch2 0x00 Touchscreen Interface 0x03 RegTouch3 0x00 0x04 RegChanMsk 0xC0 0x05 RegHapt0 0x00 0x06 RegHapt1 0x00 0x07 RegHapt2 0x00 Haptics Interface and Temperature Sensor 0x08 RegHapt3 0x80 0x09 RegHapt4 0x00 0x0A RegHapt5 0x00 0x0B RegProx0 0x00 0x0C RegProx1 0x00 0x0D RegProx2 0x00 0x0E RegProx3 0x00 0x0F RegProx4 0x00 0x10 RegProx5 0x00 0x11 RegProx6 0x00 0x12 RegProx7 0x00 0x13 RegProx8 0x00 0x14 RegProx9 0x00 0x15 RegProx10 0x00 0x16 RegProx11 0x00 Proximity Sensing Interface 0x17 RegProx12 0x00 0x18 RegProx13 0x00 0x19 RegProx14 0x00 0x1A RegProx15 0x00 0x1B RegProx16 0x00 0x1C RegProx17 0x00 0x1D RegProx18 0x00 0x1E RegProx19 0x00 0x1F RegProx20 0x00 0x20 RegProx21 0x01 0x21 RegProx22 0x00 0x22 RegIrqMsk 0x08 0x23 RegIrqSrc 0x00 Interrupt and Chip Status 0x24 RegStat 0x00 0x25 RegAux0 0x00 Auxiliary Functions 0x26 RegAux1 0x00 0x3F RegReset 0x00 Software Reset Table 11 : Registers Overview NOTES: 1) Addresses not listed above are reserved and should not be written. 2) Reserved bits should be left to their default value unless otherwise specified. 3) Proximity related registers/bits do not apply to SX8655. 4) Haptics related registers/bits do not apply to SX8656. Rev 1 – 25th July 2011 47 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Bits Variable Default Description 7:4 TOUCHRATE 0000 Defines the touch coordinates acquisition rate: 0000 : OFF. 0001 : 10 cps 0010 : 20 cps 0011 : 40 cps 0100 : 60 cps 0101 : 80 cps 0110 : 100 cps 0111 : 200 cps 1000 : 300 cps 1001 : 400 cps 1010 : 500 cps 1011 : 1 kcps 1100 : 2 kcps 1101 : 3 kcps 1110 : 4 kcps 1111 : 5 kcps Values above assume typical FOSCL, else vary accordingly. 3:0 POWDLY 0000 Defines the bias settling time for each channel’s first conversion: 0000 : 0.5 us 0001 : 1.1 us 0010 : 2.2 us 0011 : 4.4 us 0100 : 8.9 us 0101 : 17.8 us 0110 : 35.5 us 0111 : 71.0 us 1000 : 142 us 1001 : 284 us 1010 : 568 us 1011 : 1.14 ms 1100 : 2.27 ms 1101 : 4.55 ms 1110 : 9.09 ms 1111 : 18.19 ms Values above assume typical FOSCH, else vary accordingly. Table 12 : RegTouch0 (Addr 0x00) Bits Variable Default Description 7:5 Reserved 001 4 TSTYPE 0 Defines the type of touchscreen: 0 : 4-wire 1 : 5-wire 3:2 RPNDT 00 Defines the pen detection circuit’s pull-up resistor value: 00 : 114 kOhms 01 : 228 kOhms 10 : 57 kOhms 11 : 28 kOhms Rev 1 – 25th July 2011 48 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 1:0 FILT 00 Defines the channel filtering algorithm: 00 : OFF (Nfilt = 1) 01 : 3 sample averaging (Nfilt = 3) 10 : 5 sample averaging (Nfilt = 5) 11 : 3 sample averaging after removal of extreme values (Nfilt = 7) Table 13 : RegTouch1 (Addr 0x01) Bits Variable Default Description 7:4 Reserved 0000 3:0 SETDLY 0000 Defines the bias settling time for each channel’s subsequent conversion (i.e. when filtering is enabled): 0000 : 0.5 us 0001 : 1.1 us 0010 : 2.2 us 0011 : 4.4 us 0100 : 8.9 us 0101 : 17.8 us 0110 : 35.5 us 0111 : 71.0 us 1000 : 142 us 1001 : 284 us 1010 : 568 us 1011 : 1.14 ms 1100 : 2.27 ms 1101 : 4.55 ms 1110 : 9.09 ms 1111 : 18.19 ms Values above assume typical FOSCH, else vary accordingly. Table 14 : RegTouch2 (Addr 0x02) Bits Variable Default Description 7:0 Reserved 0x00 Table 15 : RegTouch3 (Addr 0x03) Bits Variable Default Description 7 XCONV 1 Enables X channel conversion: 0 : OFF 1 : ON 6 YCONV 1 Enables Y channel conversion: 0 : OFF 1 : ON 5 Z1CONV 0 Enables Z1 channel conversion: 0 : OFF 1 : ON 4 Z2CONV 0 Enables Z2 channel conversion: 0 : OFF 1 : ON 3:0 Reserved 0000 Table 16 : RegChanMsk (Addr 0x04) Bits Variable Default Description 7 HAPTMODE 0 Defines the haptics mode/input: 0 : PWM 1 : I2C Rev 1 – 25th July 2011 49 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 6:5 HAPTTYPEEN 00 Defines the haptics load: 00 : OFF. Haptics block disabled. 01 : LRA 10 : ERM 11 : Reserved 4 HAPTRANGE 0 Defines MIN prescaler value: 0 : 128 1 : 256 3:0 HAPTGAIN 0000 Defines the haptics output gain: 0000 : 1 0001 : ~1.17 0010 : ~1.34 0011 : ~1.51 0100 : ~1.67 0101 : ~1.84 0110 : ~2.01 0111 : ~2.18 1000 : ~2.35 1001 : ~2.52 1010 : ~2.69 1011 : ~2.86 1100 : ~3.03 1101 : ~3.20 1110 : ~3.37 1111 : ~3.53 Exact formula is 1 + Code * 0.169 Table 17 : RegHapt0 (Addr 0x05) Bits Variable Default Description 7:6 Reserved 00 5:3 HAPTSQUELCH 000 Defines the Haptics squelch, i.e. the range of AmplitudeCode (HAPTAMP or MIN duty cycle equivalent, Cf. § 6) which will generate a 0V output (VMOUT): 000 : OFF. No squelch. 001 : -1 < AmplitudeCode < +1 (ie. AmplitudeCode = 0) 010 : -2 < AmplitudeCode < +2 011 : -4 < AmplitudeCode < +4 100 : -8 < AmplitudeCode < +8 101 : -16 < AmplitudeCode < +16 110 : -32 < AmplitudeCode < +32 111 : -64 < AmplitudeCode < +64 2 TEMPWRNIRQEDG 0 Enables TempWrnIrq to be generated when the chip temperature gets below the alarm threshold : 0 : OFF. TempWrnIrq generated only when the chip temperature gets above the alarm threshold. 1 : ON. TempWrnIrq generated both when the chip temperature gets above and below the alarm threshold. 1 TEMPALRMIRQEDG 0 Enables TempAlrmIrq to be generated when the chip temperature gets below the alarm threshold : 0 : OFF. TempAlrmIrq generated only when the chip temperature gets above the alarm threshold. 1 : ON. TempAlrmIrq generated both when the chip temperature gets above and below the alarm threshold. 0 TEMPALWAYSON 0 Enables the temperature monitoring even when no operation (touch, proximity, haptics) is enabled: 0 : OFF 1 : ON Table 18 : RegHapt1 (Addr 0x06) Rev 1 – 25th July 2011 50 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Bits Variable Default Description 7:0 HAPTAMP 0x00 Defines the haptics output polarity and level in I2C mode i.e. AmplitudeCode (Cf. § 6) : 0xFF : +127 (Max positive) … 0x81 : +1 0x80 : +0 0x00 : -0 0x01 : -1 … 0x7F : -127 (Max negative) HAPTAMP[7] gives the sign of AmplitudeCode (1=>+;0=>-) while HAPTAMP[6:0] give its magnitude. Table 19 : RegHapt2 (Addr 0x07) Bits Variable Default Description 7:5 HAPTBW 100 Defines the haptics low-pass filter cut off frequency (Hz): 000 : OFF. No filtering. 001 : ~210 * SamplingFreq / 100 010 : ~280 * SamplingFreq / 100 011 : ~425 * SamplingFreq / 100 100 : ~565 * SamplingFreq / 100 101 : ~700 * SamplingFreq / 100 110 : ~850 * SamplingFreq / 100 111 : ~980 * SamplingFreq / 100 SamplingFreq is VMOUT_Freq in LRA mode and MIN_Freq (PWM) or FOSCL (I2C) in ERM mode (Cf. § 6) 4 HAPTHZ 0 Sets MOUTP and MOUTN to high impedance (HZ): 0 : Normal 1 : HZ 3 HAPTSHORTPROT 0 Disables short-circuit protection: 0 : ON . A short-circuit event will automatically stop haptics operation. 1 : OFF. A short-circuit event will not stop haptics operation. In both cases HAPTSHORTSTAT is still updated (and hence an interrupt can still be generated if needed) 2:0 HAPTTIMERMSB 000 Defines the haptics timer overflow value used to generate the LRA’s 128 or 256 multiple frequency from MIN. Table 20 : RegHapt3 (Addr 0x08) Bits Variable Default Description 7:0 HAPTTIMERLSB 0x00 Defines the haptics timer overflow value used to generate the LRA’s 128 or 256 multiple frequency from MIN. HAPTTIMER[9:0] values below 8 (ie 0-7) are reserved. Table 21 : RegHapt4 (Addr 0x09) Bits Variable Default Description 7:0 Reserved 0x00 Table 22 : RegHapt5 (Addr 0x0A) Bits Variable Default Description 7 PROXRAWFILTSEL 0 Defines the proximity raw filtering range for PROXRAWFILT : 0 : Fast 1 : Slow 6 PROXIRQSEL 0 Defines the function of bits 5 of RegIrqMsk and RegIrqSrc. 0 : ProxFar 1 : ProxConvDone Rev 1 – 25th July 2011 51 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 5:4 PROXHYST 00 Defines the proximity detection hysteresis : 00 : OFF 01 : 32 10 : 128 11 : 512 3:0 PROXSCANPERIOD 0000 Defines the proximity scan period : 0000 : OFF. Proximity sensing disabled 0001 : 1 / TOUCHRATE (Cf. RegTouch0) 0010 : 2 / TOUCHRATE 0011 : 4 / TOUCHRATE 0100 : 8 / TOUCHRATE 0101 : 16 / TOUCHRATE 0110 : 32 / TOUCHRATE 0111 : 64 / TOUCHRATE 1000 : 128 / TOUCHRATE 1001 : 256 / TOUCHRATE 1010 : 512 / TOUCHRATE 1011 : 1024 / TOUCHRATE 1100 : 2048 / TOUCHRATE 1101 : 4096 / TOUCHRATE 1110 : 8192 / TOUCHRATE 1111 : 16384 / TOUCHRATE Table 23 : RegProx0 (Addr 0x0B) Bits Variable Default Description 7:0 PROXTHRESH 0x00 Defines the proximity detection threshold (for PROXSTAT update). Threshold = 16 x register value Table 24 : RegProx1 (Addr 0x0C) Bits Variable Default Description 7:6 PROXCLOSEDEB 00 Defines the “Close” debounce (for PROXSTAT update): 00 : OFF 01 : 2 samples 10 : 4 samples 11 : 8 samples 5:4 PROXFARDEB 00 Defines the “Far” debounce (for PROXSTAT update): 00 : OFF 01 : 2 samples 10 : 4 samples 11 : 8 samples 3:0 PROXCOMPPRD 0000 Defines the periodic compensation : 0 : OFF Else : register value x 128 samples Table 25 : RegProx2 (Addr 0x0D) Bits Variable Default Description 7:0 PROXSTUCK 0x00 Defines the stuck at timeout (ie max “Close” time before a compensation is automatically requested) : 0 : OFF Else : register value x 16 samples Table 26 : RegProx3 (Addr 0x0E) Bits Variable Default Description 7:0 PROXAVGPOSTHRESH 0x00 Defines the average positive threshold (for compensation). Threshold = 8 x register value Table 27 : RegProx4 (Addr 0x0F) Rev 1 – 25th July 2011 52 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Bits Variable Default Description 7:5 PROXAVGPOSDEB 000 Defines the average positive debounce (for compensation) : 000 : OFF 001 : 2 samples 010 : 4 samples 011 : 8 samples 100 : 16 samples 101 : 32 samples 110 : 64 samples 111 : 128 samples 4:2 PROXAVGPOSFILT 000 Defines the average positive filter coefficient : 000 : 0 (ie filtering OFF) 001 : 1 – 1/2 010 : 1 – 1/4 011 : 1 – 1/8 100 : 1 – 1/16 101 : 1 – 1/32 110 : 1 – 1/64 111 : 1 – 1/128 1:0 PROXRAWFILT 00 Defines the raw filter coefficient. If PROXRAWFILTSEL = 0 : 00 : 0 (ie filtering OFF) 01 : 1 – 1/2 10 : 1 – 1/4 11 : 1 – 1/8 If PROXRAWFILTSEL = 1 : 00 : 1 – 1/16 01 : 1 – 1/32 10 : 1 – 1/64 11 : 1 – 1/128 Table 28 : RegProx5 (Addr 0x10) Bits Variable Default Description 7:0 PROXAVGNEGTHRESH 0x00 Defines the average negative threshold (for compensation). Threshold = – 8 x register value Table 29 : RegProx6 (Addr 0x11) Bits Variable Default Description 7:5 PROXAVGNEGDEB 000 Defines the average negative debounce (for compensation) : 000 : OFF 001 : 2 samples 010 : 4 samples 011 : 8 samples 100 : 16 samples 101 : 32 samples 110 : 64 samples 111 : 128 samples 4:2 PROXAVGNEGFILT 000 Defines the average negative filter coefficient : 000 : 0 (i.e. filtering OFF) 001 : 1 – 1/2 010 : 1 – 1/4 011 : 1 – 1/8 100 : 1 – 1/16 101 : 1 – 1/32 110 : 1 – 1/64 111 : 1 – 1/128 1 PROXHIGHIM 0 Enables high noise immunity mode : 0 : OFF 1 : ON, at the expense of higher power consumption. 0 Reserved 0 Table 30 : RegProx7 (Addr 0x12) Rev 1 – 25th July 2011 53 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Bits Variable Default Description 7:4 Reserved 0000 3:0 PROXRAWMSB 0000 Provides the proximity raw information for monitoring purposes. Signed, 2's complement format. Read-only (using PROXCONVDONE), do not write. Table 31 : RegProx8 (Addr 0x13) Bits Variable Default Description 7:0 PROXRAWLSB 0x00 Provides the proximity raw information for monitoring purposes. Signed, 2's complement format. Read-only (using PROXCONVDONE), do not write. Table 32 : RegProx9 (Addr 0x14) Bits Variable Default Description 7:4 Reserved 0000 3:0 PROXUSEFULMSB 0000 Provides the proximity information for monitoring purposes. Signed, 2's complement format. Read-only (using PROXCONVDONE), do not write. Table 33 : RegProx10 (Addr 0x15) Bits Variable Default Description 7:0 PROXUSEFULLSB 0x00 Provides the proximity information for monitoring purposes. Signed, 2's complement format. Read-only (using PROXCONVDONE), do not write. Table 34 : RegProx11 (Addr 0x16) Bits Variable Default Description 7:4 Reserved 0000 3:0 PROXAVGMSB 0000 Provides the proximity average information for monitoring purposes. Signed, 2's complement format. Read-only (using PROXCONVDONE), do not write. Table 35 : RegProx12 (Addr 0x17) Bits Variable Default Description 7:0 PROXAVGLSB 0x00 Provides the proximity average information for monitoring purposes. Signed, 2's complement format. Read-only (using PROXCONVDONE), do not write. Table 36 : RegProx13 (Addr 0x18) Bits Variable Default Description 7:5 Reserved 0000 4:0 PROXDIFFMSB 0000 Provides the proximity differential information for monitoring purposes. Signed, 2's complement format. Read-only (using PROXCONVDONE), do not write. Table 37 : RegProx14 (Addr 0x19) Bits Variable Default Description 7:0 PROXDIFFLSB 0x00 Provides the proximity differential information for monitoring purposes. Signed, 2's complement format. Read-only (using PROXCONVDONE), do not write. Table 38 : RegProx15 (Addr 0x1A) Bits Variable Default Description 7:0 PROXOFFSETMSB 0x00 Provides the proximity compensation offset information for monitoring purposes. Read-only (using PROXCONVDONE), do not write. Table 39 : RegProx16 (Addr 0x1B) Rev 1 – 25th July 2011 54 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Bits Variable Default Description 7:0 PROXOFFSETLSB 0x00 Provides the proximity compensation offset information for monitoring purposes. Read-only (using PROXCONVDONE), do not write. Table 40 : RegProx17 (Addr 0x1C) Bits Variable Default Description 7 Reserved 0 6:4 PROXSENSITIVITY 000 Defines the sensitivity : 000 : 0 (Min) 001 : 1 010 : 2 011 : 3 100 : 4 101 : 5 110 : 6 111 : 7 (Max) 3:1 PROXFREQ 000 Defines the operating frequency : 010 : 64 kHz 011 : 90 kHz 100 : 112 kHz 101 : 150 kHz (recommended) Else : Reserved 0 Reserved 0 Table 41 : RegProx18 (Addr 0x1D) Bits Variable Default Description 7:4 PROXSENSORCON 0000 Defines the proximity sensor connection, Cf. § 5.1 : 0000 : None 0001 : AUX1/WIPER (5-wire TS) 0010 : AUX2 (external) 1000 : X (standard 4-wire TS) 1001 : Y (inverted 4-wire TS) Else : Reserved 3:0 PROXSHIELDCON 0000 Defines the proximity shield connection, Cf. § 5.1 : 0000 : None 0011 : AUX3 (external) 1000 : X (inverted 4-wire TS) 1001 : Y (standard 4-wire TS or 5-wire TS) Else : Reserved Table 42 : RegProx19 (Addr 0x1E) Bits Variable Default Description 7:6 Reserved 00 5:3 PROXBOOST 000 Enables proximity boost mode (higher sensitivity) : 100 : ON 110 : OFF (recommended; compulsory when sensor is TS) Else : Reserved 2:0 Reserved 000 Must be set to 100. Table 43 : RegProx20 (Addr 0x1F) Bits Variable Default Description 7:0 Reserved 0x01 Must be set to 0x81. Table 44 : RegProx21 (Addr 0x20) Bits Variable Default Description 7:0 Reserved 0x00 Table 45 : RegProx22 (Addr 0x21) Rev 1 – 25th July 2011 55 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Bits Variable Default Description 7 HAPTSHORTIRQEN 0 Enables the HaptShort interrupt. 0 : OFF 1 : ON 6 PROXCLOSEIRQEN 0 Enables the ProxClose interrupt. 0 : OFF 1 : ON 5 PROXFARIRQEN/ 0 Enables the ProxFar/ProxConvDone interrupt. Cf RegProx0[6] PROXCONVDONEIRQEN 0 : OFF 1 : ON 4 PROXCOMPDONEIRQEN 0 Enables the ProxCompDone interrupt. 0 : OFF 1 : ON 3 PENTOUCHIRQEN/ 1 Enables the PenTouch/TouchConvDone interrupt TOUCHCONVDONEIRQEN 0 : OFF 1 : ON 2 PENRELEASEIRQEN 0 Enables the PenRelease interrupt. 0 : OFF 1 : ON 1 TEMPWARNINGIRQEN 0 Enables the TempWarning interrupt. 0 : OFF 1 : ON 0 TEMPALARMIRQEN 0 Enables the TempAlarm interrupt. 0 : OFF 1 : ON Table 46 : RegIrqMsk (Addr 0x22) Bits Variable Default Description 7 HAPTSHORTIRQ 0 Gives the HaptShort interrupt source status. (ie HAPTSHORTSTAT rising edge) 6 PROXCLOSEIRQ 0 Gives the ProxClose interrupt source status. (ie PROXSTAT rising edge) 5 PROXFARIRQ/ 0 Gives the ProxFar (ie PROXSTAT falling edge), or PROXCONVDONEIRQ ProxConvDone (ie CONVSTAT falling edge after proximity conversion) interrupt status depending on PROXIRQSEL . 4 PROXCOMPDONEIRQ 0 Gives the ProxCompDone interrupt source status. (ie PROXCOMPSTAT falling edge) 3 PENTOUCHIRQ/ 0 Gives the PenTouch/TouchConvDone interrupt source status. (ie TOUCHCONVDONEIRQ in PENDET mode -> PENSTAT rising edge, else -> CONVSTAT falling edge after touch conversion) 2 PENRELEASEIRQ 0 Gives the PenRelease interrupt source status. (ie PENSTAT falling edge) 1 TEMPWARNINGIRQ 0 Gives the TempWarning interrupt source status. (ie TEMPWARNINGSTAT rising/falling edge depending on TEMPWRNIRQEDG) 0 TEMPALARMIRQ 0 Gives the TempAlarm interrupt source status. (ie TEMPALARMSTAT rising/falling edge depending on TEMPALRMIRQEDG) Table 47 : RegIrqSrc (Addr 0x23) Bits Variable Default Description 7 HAPTSHORTSTAT 0 Gives the haptics short-circuit instantaneous status : 0 : No short circuit is currently present 1 : A short circuit is currently present 6 RESETSTAT 0 Gives the reset latched status : 0 : No reset occurred 1 : A reset occurred This bit is cleared when RegStat is read. Rev 1 – 25th July 2011 56 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 5 PROXSTAT 0 Gives the proximity instantaneous status: 0 : Far (or proximity sensing disabled) 1 : Close PROXSTAT (and PROXAVG) is automatically frozen to its current value if pen is down (whether TS or AUXi is the sensor) PROXSTAT is NOT frozen while haptics is running, if needed host can turn proximity sensing ON/OFF via PROXSCANPERIOD. 4 PROXCOMPSTAT 0 When read, this bit indicates gives the compensation instantaneous status : 0 : No compensation is currently pending 1 : A compensation is currently pending execution and/or completion When set to ‘1’, triggers a compensation for next scan period. 3 CONVSTAT 0 Gives touch/proximity conversion instantaneous status : 0 : No touch or proximity conversion is currently running 1 : A touch or proximity conversion is currently running 2 PENSTAT 0 Gives the pen instantaneous status : 0 : Released/Up 1 : Touching/Down 1 TEMPWARNINGSTAT 0 Gives the temperature warning instantaneous status : 0 : Temperature is below warning threshold 1 : Temperature is above warning threshold 0 TEMPALARMSTAT 0 Gives the temperature alarm instantaneous status : 0 : Temperature is below alarm threshold 1 : Temperature is above alarm threshold Table 48 : RegStat (Addr 0x24) Bits Variable Default Description 7 Reserved 0 6 AUX1DIGOUTEN 0 Enables the digital output capability of AUX1 0 : OFF 1 : ON, Cf. AUX1DIGOUT. Bit is ignored if TSTYPE = 1 or PROXSENSORCON = 0001 5 AUX2DIGOUTEN 0 Enables the digital output capability of AUX2 0 : OFF 1 : ON, Cf. AUX2DIGOUT. Bit is ignored if PROXSENSORCON = 0010 4 AUX3DIGOUTEN 0 Enables the digital output capability of AUX3 0 : OFF 1 : ON, Cf. AUX3DIGOUT. Bit is ignored if TSTYPE = 1 or PROXSHIELDCON = 0011 3:0 AUX1DIGOUT 0000 Defines the digital signal to output on AUX1 : 0000 : RegIrqSrc(0) 1000 : RegStat(0) 0001 : RegIrqSrc(1) 1001 : RegStat(1) 0010 : RegIrqSrc(2) 1010 : RegStat(2) 0011 : RegIrqSrc(3) 1011 : RegStat(3) 0100 : RegIrqSrc(4) 1100 : RegStat(4) 0101 : RegIrqSrc(5) 1101 : RegStat(5) 0110 : RegIrqSrc(6) 1110 : RegStat(6) 0111 : RegIrqSrc(7) 1111 : RegStat(7) Table 49 : RegAux0 (Addr 0x25) Rev 1 – 25th July 2011 57 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Bits Variable Default Description 7:4 AUX2DIGOUT 0000 Defines the digital signal to output on AUX2 : 0000 : RegIrqSrc(0) 1000 : RegStat(0) 0001 : RegIrqSrc(1) 1001 : RegStat(1) 0010 : RegIrqSrc(2) 1010 : RegStat(2) 0011 : RegIrqSrc(3) 1011 : RegStat(3) 0100 : RegIrqSrc(4) 1100 : RegStat(4) 0101 : RegIrqSrc(5) 1101 : RegStat(5) 0110 : RegIrqSrc(6) 1110 : RegStat(6) 0111 : RegIrqSrc(7) 1111 : RegStat(7) 3:0 AUX3DIGOUT 0000 Defines the digital signal to output on AUX3 : 0000 : RegIrqSrc(0) 1000 : RegStat(0) 0001 : RegIrqSrc(1) 1001 : RegStat(1) 0010 : RegIrqSrc(2) 1010 : RegStat(2) 0011 : RegIrqSrc(3) 1011 : RegStat(3) 0100 : RegIrqSrc(4) 1100 : RegStat(4) 0101 : RegIrqSrc(5) 1101 : RegStat(5) 0110 : RegIrqSrc(6) 1110 : RegStat(6) 0111 : RegIrqSrc(7) 1111 : RegStat(7) Table 50 : RegAux1 (Addr 0x26) Bits Variable Default Description 7:0 SOFTRESET 0x00 Writing 0xDE will reset the chip and all registers to their default values. Table 51 : RegReset (Addr 0x3F) Rev 1 – 25th July 2011 58 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 13 APPLICATION INFORMATION 13.1 Typical Application Circuit Figure 57 – Typical Application Circuit 13.2 External Components Recommended Values Symbol Description Note Min Typ. Max Unit CVDD Main supply decoupling capacitor - 1 - uF CMVDD Motor supply decoupling capacitor - 10 - uF CVREG Regulator decoupling capacitor +/- 20%, ESR<1Ω - 100 - nF RPULL Host interface pull-ups +/- 50% - 10 - kΩ Proximity sensor-to-shield CTB - - <0.7 1.5 nF capacitance RXY Proximity sensor serial resistor - - <1 1.5 kΩ RMOT Motor resistance - 7.5 - - Ω CMOUT Motor output capacitor - - 1 - uF Table 52 : External Components Recommended Values Rev 1 – 25th July 2011 59 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 14 PACKAGING INFORMATION 14.1 QFN Package Figure 58 - Outline Drawing - QFN Figure 59 - Land Pattern - QFN Rev 1 – 25th July 2011 60 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING 14.2 CSP Package Figure 60 - Outline Drawing - CSP Figure 61 - Land Pattern - CSP Rev 1 – 25th July 2011 61 www.semtech.com

SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING © Semtech 2011 All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent or other industrial or intellectual property rights. Semtech assumes no responsibility or liability whatsoever for any failure or unexpected operation resulting from misuse, neglect improper installation, repair or improper handling or unusual physical or electrical stress including, but not limited to, exposure to parameters beyond the specified maximum ratings or operation outside the specified range. SEMTECH PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF SEMTECH PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE UNDERTAKEN SOLELY AT THE CUSTOMER’S OWN RISK. Should a customer purchase or use Semtech products for any such unauthorized application, the customer shall indemnify and hold Semtech and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs damages and attorney fees which could arise. Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners. Contact Information Semtech Corporation Advanced Communications and Sensing Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805) 498-2111 Fax: (805) 498-3804 Rev 1 – 25th July 2011 62 www.semtech.com