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Datasheet AS1123 Constant-Current, 16-Channel LED Driver with Diagnostics 1 General Description 2 Key Features d The AS1123 is designed to drive up to 16 LEDs through a fast serial (cid:1) 16 Constant-Current Output Channels interface and features 16 output constant current drivers and an on- (cid:1) Excellent Output Current Accuracy chip diagnostic read-back function. i - Between Channels: <±3% l The high clock-frequency (up to 50MHz), adjustable output current, - Between Devices: <±3% a and flexible serial interface makes the device perfectly suited for high-volume transmission applications. (cid:1) Output Current Per Channel: 0.5mA to 40mA v Output current is adjustable (up to 40mA/channel) using an external (cid:1) Over-Temperature, Open-LED, Shorted-LED resistor (REXT). Diagnostic Functions l The serial interface with Schmitt trigger inputs includes an integrated (cid:1) Low-Current Test Mode l shift register. Additionally, an internal data register stores the cur- (cid:1) Global F ault Monitoring i rently displayed data. (cid:1) Fast GSerial Interface: 50MHz t The device features integrated diagnostics for over- s temperature, open-LED, and shorted-LED conditions. Integrated (cid:1) Cascaded Configuration registers store global fault status information during load as well as A(cid:1) Extremely Fast Output D rivers Suitable for PWM the detailed temperature/open-LED/shorted-LED diagnostics results. t (cid:1) Output Delay for controlling Inrush Current (on request) The AS1123 also features a low-current diagnostic mode to minimiz e n display flicker during fault testing. s (cid:1) 24-pin QSOP and 24-pin TQFN (4x4mm) Package The AS1123 is available in a 24-pin QSOP and a 24-pin TQFN e (4x4mm) package. m 3 Applications t n The device is ideal for fixed- or slow-rolling displays using static or a multiplexed LED matrix and dimming functions, large LED matrix dis- o plays, mixed LED display and switch monitoring, displays in eleva- tors, public transports (underground, trains, buses, taxis, airplanes, c etc.), large displays in stadiums and public areas, price indicators in retail stores, promotional panels, bar-graph displays, industrial con- troller displays, white good panels, emergency light indicators, and l traffic signs. a Figure 1. AS1123 - Typical Application Diagram c i +VLED n N0 N1 N2 N3 N4 N5 N6 N7 N8 N9 N10 N11 N12 N13 N14 N15 UT UT hUT UT UT UT UT UT UT UT UT UT UT UT UT UT O O O O O O O O O O O O O O O O c e AS1123 SDI SDO T CLK LD OEN REXT GND VDD www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 1 - 24

AS1123 Datasheet - Pinout 4 Pinout Pin Assignments Figure 2. Pin Assignments (Top View) d 0 1 9 8 7 6 5 N N N N N N UT UT UT UT UT UT 15 14 13 12 11 10 9 8 i O O O O O O T N N N N N N N N l D X O N T T T T T T T T 24 23 22 21 20 19 D E D E U U U U U U U U a V R S O O O O O O O O O OUTN11 1 18 OUTN4 24 23 22 21 20 19 18 17 16 15 14 13 v OUTN12 2 AS1123 17 OUTN3 OUTN13 3 24-pin TQFN 16 OUTN2 AS1123 OUTN14 4 (4x4mm) 15 OUTN1 l 24-pin QSOP l OUTN15 5 14 OUTN0 Exposed i OEN 6 Pad 13 LD G 1 2 3 4 5 6 7 t8 9 10 11 12 SDO7 EXT8 VDD9 GND10 SDI11 CLK12 A GND SDI CLK LD OUTN0 OUTN1sOUTN2 OUTN3 OUTN4 OUTN5 OUTN6 OUTN7 R t n s Pin Descriptions e Table 1. Pin Descriptions m t Pin Number Pin Name n Description QSOP TQFN a 1 10 GND Ground o 2 11 SDI Serial Data Input c Serial Data Clock. The rising edge of the CLK signal is used to clock data into and out of the 3 12 CLK AS1123 shift register. In error mode, the rising edge of the CLK signal is used to switch error modes. l 4 13 LD Seriala Data Load. Pull-down Resistor Output Current Drivers. These pins are used as LED drivers or for input sense for diagnostic 5:20 1:5, 14:24 OUTN0:15 c modes. Data is transferred to the data register at the rising edge of these pins. Output Enable. Pull-up Resistor. The active-low pin OEN signal can always enable output drivers i to sink current independent of the AS1123 mode. 21 6 OnEN 0 = Output drivers are enabled. 1 = Output drivers are disabled. h Serial Data Output. In normal mode SDO is latched out 8.5 clock cycles after SDI is latched in. c In global error detection mode this pin indicates the occurrence of a global error. 22 7 SDO 0 = Global error mode returned an error. e 1 = No errors. External Resistor Connection. This pin connects through the external resistor (REXT) to GND, to 2T3 8 REXT setup the load current. 24 9 VDD Positive Supply Voltage Exposed Exposed Pad. This pin also functions as a heat sink. Solder it to a large pad or to the circuit-board - Pad ground plane to maximize power dissipation. www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 2 - 24

AS1123 Datasheet - Absolute Maximum Ratings 5 Absolute Maximum Ratings Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in Section 6 Electrical Characteristics on page 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 2. Absolute Maximum Ratings d Parameter Min Max Units Comments Electrical Parameters i l VDD to GND 0 7 V a Input Voltage -0.4 VDD+0.4 V v Output Voltage -0.4 7 V 2000 mA 24-pin QSOP package GND Pin Current 2800 mA 24-pin TQFN (4x4mm) paclkage l Input Current (latch-up immunity) -100 +100 mA Norm: JEDEC 78 i Electrostatic Discharge G t Electrostatic Discharge HBM +/- 1 kV Norm: MIL 8s83 E method 3015 Temperature Ranges and Storage Conditions A 88 ºC/W on PCB, 24-pin QSOP package Thermal Resistance Q JA t 23 ºC/W on nPCB, 24-pin TQFN (4x4mm) package Junction Temperature s150 °C e Storage Temperature -55 150 ºC m tThe reflow peak soldering temperature (body temperature) specified is in accordance with IPC/JEDEC J-STD-020 n “Moisture/Reflow Sensitivity Classification for Non- Package Body Temperature a +260 ºC Hermetic Solid State Surface Mount Devices”. o The lead finish for Pb-free leaded packages is matte tin (100% Sn). Humidity 5 c85 % Non-condensing Moisture Sensitive Level 3 Represents a max. floor life time of 168h l a c i n h c e T www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 3 - 24

AS1123 Datasheet - Electrical Characteristics 6 Electrical Characteristics VDD = +3.0V to +5.5V, Typical values are at TAMB = +25°(unless otherwise specified). All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality Control) methods. Table 3. Electrical Characteristics Symbol Parameter Condition Min Typ Max Unit d TAMB Operating Ambient Temperature -40 +85 °C TJ Operating Junction Temperature -40 +125 °C i l VDD Supply Voltage 3.0 5.5 Va VDS Output Voltage OUTN0:15 0 5.5 V v IOUT OUTN0:15, VDD = 5V 0.5 40 IOH Output Current SDO -1.0 mA l IOL SDO 1.0 l VIH High Level 0.7 x i VDD + G VDtD 0.3 Input Voltage CLK, OEN, LD, SDI V s 0.3 x VIL Low Level -0.3 VDD IDS(OFF) Output Leakage Current OAEN = 1, VDS = 5.5V 1.5 µA t VOL IOL = +1.0mA 0.4 Output n SDO V VOH Voltage s IOH = -1.0mA V0D.4DV - e IAV1 Device-tofr-oDme vOicUeT ANv0e rtaog OeU OTuNtp1u5t Currenmt VDS =R 0E.6XVtT, V= D4D70 =W Const., 38.8 41.2 mA D IAV1 (BeCtwuererenn Ct Shakenwne lsa) VDS ‡ R n0E.6XVT, V= D4D70 =W C onst., ±1 ±3 % IAV2 Device-tofr-oDme vOicUeT ANv0e rtaog OeU OTuNtp1u5t Current o VDSR =E 0X.T5 V=, 1V.D87Dk >W 3.3V, 9.6 10.4 mA D IAV2 (BeCtwuererenn Ct Shakenwne ls) c VDS ‡R 0E.X5TV ,= V 1D.8D7 =k WC onst., ±1 ±4 % ILC Low-Current Diagnosis Mode l VDS = 0.8V, VDD = 5.0V 0.4 0.6 0.8 mA %/D VDS OutpOuut tVpuotlt aCguer rRenetg vusla. tiona VDS within 1.0 and 3.0V @ IOUT = 40mA ±0.7 %/V c %/D VDD SuppOlyu tVpoultt aCguer rRenetg vusla. tion VDD within 3.0 and 5.0V ±0.2 %/V i RIN(UP) Pullup Resistance OEN 250 500 800 kW n RIN(DOWN) Pulldown Resistance LD 250 500 800 kW VTHL Error hDetection Threshold Voltage 0.25 0.3 0.45 V c Error Detection Threshold Voltage VDD = 3.0V 1.6 V (Level1 = default) VDD = 5.0V 2.7 VTHH e Error Detection Threshold Voltage VDD = 3.0V 2.4 V (Level2) T VDD = 5.0V 4 TOV1 Overtemperature Threshold Flag 150 ºC REXT = 470W , OUTN0:15 = Off 4 5.5 IDD(OFF) REXT = 1.87kW , OUTN0:15 = Off 2 3.5 Supply Current mA REXT = 470W , OUTN0:15 = On 15 18 IDD(ON) REXT = 1.87kW , OUTN0:15 = On 5 7 www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 4 - 24

AS1123 Datasheet - Electrical Characteristics Switching Characteristics VDD = 3.0 to 5.5V, VDS = 0.8V, VIH = VDD, VIL = GND, REXT = 940W , VLOAD = 4.0V, RLOAD = 64W , CLOAD = 10pF; The Switching Charac- teristics are guaranteed by design. Table 4. Switching Characteristics for VDD = 5V Symbol Parameter Conditions Min Typ Max Unit tP1 CLK - SDO 5 10 ns d Propagation Delay Time tP2 LD - OUTNn 250 500 (Without Staggered Output Delay) ns tP3 OEN - OUTNn 250 500 i l tP4 Propagation Delay Time 10 ns a tW(CLK) CLK 15 tW(L) Pulse Width LD 15 vns tW(OE) OEN (@IOUT < 40mA) 500 tR * CLK Rise Time 500 ns l tF * CLK Fall Time l500 ns tOR Output Rise Time of VOUT (Turn Off) itbd 500 ns tOF Output Fall Time of VOUT (Turn On) G ttbd 500 ns tSU(D) Setup Time for SDI s5 ns tH(D) Hold Time for SDI A 5 ns tSU(L) Setup Time for LD 5 ns t tH(L) Hold Time for LD 5 ns n tTESTING OEN Time for Error Detection 2000 ns s Staggered Output Delay tSTAG e 20 40 ns (only for AS1123B) m tSU(OE) Output Enable Setup Time t 20 ns tGSW(ERROR) Global Error Switching Setup Time n 10 ns tSU(ERROR) Global Error Detection Seatup Time 10 ns tP(I/O) Propagation Delay Global Error Flag o 5 ns tSW(ERROR) Switching Time Global Error Flag 10 ns fCLK Clock Frequency (Cascade Operation) c 30 MHz tP3,ON Low-Current Test Mode Turn ON 3 5 µs tP3,OFF Propagation Delay Time Turn OFF 0.05 0.1 µs tREXT2,1 External Resistor Reaction TaimelChange RfroEmXT 2R =E X4T.17 k=W 4,7 I0OWUT, 2I O=U 4T1m =A 40mA to 0.5 1 µs tREXT2,1 External Resistor Reacction Time ChangeR frEoXmT2 R =E 4X7T10 W= ,4 I.O7UkWT2, =IO 4U0Tm1 A= 4mA to 0.5 1 µs * If multiple AS1123 devices are casciaded and tr or tf is large, it may be critical to achieve the timing required for data transfer between two cas- caded LED drivers. n h c e T www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 5 - 24

AS1123 Datasheet - Typical Operating Characteristics 7 Typical Operating Characteristics VDD = +3.0V to +5.5V, TAMB = 25ºC (unless otherwise specified). Figure 3. Output Current vs. Output Voltage Figure 4. ICOC vs. Supply Voltage; REXT = 470W d 60 42 A) A) 41.5 i m 50 m nt ( Iout = 40mA (470W ) nt ( 41 al urre 40 urre 40.5 C C v ut 30 ut 40 p p ut ut O O 39.5 nt 20 nt l sta Iout = 10mA (1.8kW ) sta 39 l on 10 on i C Iout = 4mA (4.7kW ) C 38.5G t 0 38 s 0 0.5 1 1.5 2 2.5 3 3 3.25 3.5 3.75 4 4.25 4.5 4.75 5 Output Voltage (V) A S upply Voltage (V) t Figure 5. ICOC vs. Temperature; REXT = 470W Figure 6. ICOC vs. Tempnerature; REXT = 1.8kW s 42 12 e m A) 41.5 A) 11.5 m m t nt ( 41 nt ( n11 urre 40.5 a urre 10.5 C oC ut 40 ut 10 p p Out 39.5 c Out 9.5 nt nt sta 39 sta 9 on l on C 38.5 C 8.5 a 38 8 -40 -15 10 c35 60 85 -40 -15 10 35 60 85 Temperature ((cid:1)C) Temperature ((cid:1)C) i n Figure 7. LED Error Detection Threshold vs. Supply Voltage 5 h V) Vthh - Level 1 (default) m cVthh - Level 2 d ( 4 Vthl hol e s e 3 hr TT n o cti 2 e et D or 1 Err 0 3 3.25 3.5 3.75 4 4.25 4.5 4.75 5 Supply Voltage (V) www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 6 - 24

AS1123 Datasheet - Detailed Description 8 Detailed Description The AS1123 is designed to drive up to 16 LEDs through a fast serial interface and 16 constant-current output drivers. Furthermore, the AS1123 provides diagnostics for detecting open- or shorted-LEDs, as well as over-temperature conditions for LED display systems, especially LED traffic sign applications. The AS1123 contains an 16-bit shift register and an 16-bit data register, which convert serial input data into parallel output format. At AS1123 out- d put stages, sixteen regulated current sinks are designed to provide uniform and constant current with excellent matching between ports for driv- ing LEDs within a wide range of forward voltage variations. External output current is adjustable from 0.5 to 40mA using an external resistor for flexibility in controlling the brightness intensity of LEDs. The AS1123 guarantees to endure 5.5V maximum at the outputs. i l The serial interface is capable of operating at a minimum of 30 MHz, satisfying the requirements of high-volume data transmission. a Using a multiplexed input/output technique, the AS1123 adds additional functionality to pins SDO, LD and OEN. These pins provide highly useful functions (open- and shorted-LED detection, over-temperature detection), thus reducing pin count. Over-temperature detection will wovrk on-the- run, whereas the open- and shorted-LED detection can be used on-the-run or in low-current diagnostic mode (see page 14). Figure 8. AS1123 - Block Diagram l l i +VLED G t 0 1 2 3 4 5 0 1 2 3 4 5 6 7 8 9 1 1 1 1s1 1 N N N N N N N N N N N N N N N N T T T T T T T T T T T T T T T T U U U U U U U U U U U U U U U U O O O O O O O O O AO O O O O O O t n s e mTemperature 16-Bit Open 16-Bit Short AS1123 Detection & Detection & REXT Detection Error Retgister Error Register Current n Generators a OEN o LD 16-Bit Data c Register Detailed E rror Global Detection Error l Detection a CLK 16-Bit Shift Register c SDI Control Logic i n h SDO c e T Indicates 16 Bit www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 7 - 24

AS1123 Datasheet - Detailed Description Serial Interface Data accesses are made serially via pins SDI and SDO. At each CLK rising edge, the signal present at pin SDI is shifted into the first bit of the internal shift register and the other bits are shifted ahead of the first bit. The MSB is the first bit to be clocked in. In error-detection mode the shift register will latch-in the corresponding error data of temperature-, open-, and short-error register with each falling edge of LD. The 16-bit data register will latch the data of the shift register at each rising edge of LD. This data is then used to drive the current generator out- put drivers to switch on the corresponding LEDs as OEN goes low. d Timing Diagrams i This section contains timing diagrams referenced in other sections of this data sheet. l a Figure 9. Normal Mode Timing Diagram v tW(CLK) CLK 50% 50% 50% l l tSU(D) tH(D) i G t SDI 50% 50% s A t SDO 50% n tP1 s e m tW(L) LD 50% 50%t n tSU(L) tH(L) a o OEN OEN Low = Output Enabled c OUTNx High = Output Off OUTNx 50% OUTNx Low = Output On l a tP2 c Figure 10. Output Delay Timing Diagram i OEN tW(OE) n 50% 50% h tP3 tP3 OUTN0:15 90% 90% 50% 50% 10% 10% c tOF tOR e T www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 8 - 24

AS1123 Datasheet - Detailed Description Figure 11. Data Input Timing Diagram OEN tW(OE) tSU(L) tSU(OE) d LD 16 CLK Pulses tW(L) i l a CLK v tSU(D) Data Bit Data Bit Data Bit Data Bit Data Bit Data Bit Data Bit Data Bit l SDI0 Don’t Care 15 14 13 12 n 2 1 0 l i G tH(D) t s SDO0 Old Data Old Data Old Data Old Data Old Data Old Data Old Data Old Data Don’t Care Bit 15 Bit 14 Bit 13 Bit 12 Bit n Bit 2 Bit 1 Bit 0 A tP1 t n Figure 12. Data Input Example Timing Diagram s e m t Time 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 CLK n a SDI D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 o LD OEN c OUTN0 Off On OUTN1 Off l On OUTN2 a Off On OUTN3 Off c On OUTN4 Off On OUTN5 i Off On OUTN6 n Off On OUTN7 Off h On OUTN8 Off On OUTN9 c Off On OUTN10 Off e On OUTN11 Off On OUTTN12 Off On OUTN13 Off On OUTN14 Off On OUTN15 Off On www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 9 - 24

AS1123 Datasheet - Detailed Description Figure 13. Switching Global Error Mode Timing Diagram OEN tTESTING tGSW(ERROR) LD tSU(ERROR) tGSW(ERROR) d tP(I/O) tP(I/O) tP(I/O) i l CLK tGSW(ERROR) a v SDI TFLAG(IN) OFLAG(IN) SFLAG(IN ) l l i SDO DCoanre’t TFLAG G DCoanre’t OFLAG tDCoanre’t SFLAG s Acquisition of tP4 tSW(EARROR) tSW(ERROR) Error Status t n Error-Detection Mode s e Acquisition of the error status occurs at the rising edge of OEN. Error-detection mode is started on the rising edge of LD when OEN is high. The m CLK signal must be low when entering error detection mode. Error detection for open- and shorted-LEDs can only be performed for LEDs that t are switched on during test time. To switch between error-detection modes clock pulses are needed (see Table 5). n Note: To test all LEDs, a test pattern that turns on all LEDs must be input to the AS1123. a o Global Error Mode Global error mode is entered when error-detection mode is startced. Clock pulses during this period are used to select between temperature, open-LED, and shorted-LED tests, as well as low-current diagnostic mode and shutdown mode (see Table 5). In global error mode, an error flag (TFLAG, OFLAG, SFLAG) is delivered to pin SDO if any er rors are encountered. l Table 5. Global Error Mode Selections a Clock Output Port Error-Detection Mode Global Error Flag/Shutdown Condition Pulses c TFLAG = SDO = 1: No over-temperature warning. 0 Don't Care Over-Temperature Detection i TFLAG = SDO = 0: Over-temperature warning. n OFLAG = SDO = 1: No open-LED error. 1 Enabled Open-LED Detection OFLAG = SDO = 0: Open-LED error. h SFLAG = SDO = 1: No shorted-LED error. 2 Enabled Shorted-LED Detection SFLAG = SDO = 0: Shorted-LED error. c 3 Don't Care Low-Current Diagnostic Mode e SDI = 1: Level1, VTHH set to 54% VDD (default) 4 Don't Care VTHH Level SDI = 0: Level2, VTHH set to 80% VDD T Note: For a valid result SDI must be 1 for the first device. If there are multiple AS1123s in a chain, the error flag will be gated through all devices. To get a valid result at the end of the chain, a logic 1 must be applied to the SDI input of the first device of the chain. If one device produces an error this error will show up after n*tP(I/O) + tSW(ERROR) at pin SDO of the last device in the chain. This means it is not possible to identify which device in the chain produced the error. Therefore, if a global error occurs, the detailed error report can be run to identify which AS1123, or LED produced the error. Note: When no error has occurred, the detailed error report can be skipped, setting LD and subsequently OEN low. www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 10 - 24

AS1123 Datasheet - Detailed Description Error Detection Functions Open-LED Detection The AS1123 open-LED detection is based on the comparison between VDS and VTHL. The open LED status is aquired at the rising edge of OEN and stored internally. While detecting open-LEDs the output port must be turned on. Open LED detection can be started with 1 clock pulse during error detection mode while the output port is turned on. Note: LEDs which are turned off at test time cannot be tested and will be shown as a logic 1 in the detailed error report. d Table 6. Open LED Detection Modes i Effective Output Detected Open-LED l Output Port State Meaning Point Conditions Error Status Code a On VDS < VTHL 0 Open Circuit On VDS > VTHL 1 Normal v Shorted-LED l The AS1123 shorted-LED detection is based on the comparison between VDS and VTHH. The shortened LED status is acquired at the rising l edge of OEN and stored internally. While detecting shorted-LEDs the output port must be turned on. Shorted-LED detection can be started with 2 clock pulses during error detection mode while the output port is turned on. i G t For valid results, the voltage at OUTN0:OUTN15 must be lower then VTHH under low-current diagnostic mode operating conditions. This can be s achieved by reducing the VLED voltage or by adding additional diodes, resistors or LED’s. Note: LEDs which are turned off at test time cannot be tested and will beA shown as a logic 1 in the de tailed error report. t Table 7. Shorted LED Detection Modes n Effective Output Detected Shorted-LED Output Port State s Meaning Point Conditions Error Status Code e On VDS > VTHH 0 Short Circuit m On VDS < VTHH t 1 Normal n Overtemperature a Thermal protection for the AS1123 is provided by continuously monitoring the device’s core temperature. The overtemperature status is acquired o at the rising edge of OEN and stored internally. Table 8. Overtemperature Modes c Effective Output Detected Overtemperature Output Port State Meaning Point Conditio ns Status Code Don’t Care Temperaturel > TOV1 0 Overtemperature Condition Don’t Care Temperataure < TOV1 1 Normal c i n h c e T www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 11 - 24

AS1123 Datasheet - Detailed Description Detailed Error Reports The detailed error report can be read out after global error mode has been run. At the falling edge of LD, the detailed error report of the selected test is latched into the shift register and can be clocked out with n*16 clock cycles (n is the number of AS1123s in a chain) via pin SDO. At the same time new data can be written into the shift register, which is loaded on the next rising edge of pin LD. This pattern is shown at the output drivers, at the falling edge of OEN. Detailed Temperature Warning Report d The detailed temperature warning report can be read out immediately after global error mode has been run. SDI must be 1 for the first device. Bit0 of the 16bit data word represents the temperature flag of the chip. i l Figure 14. Detailed Temperature Warning Report Timing Diagram a Global Flag Readout Detailed Error Report Readout v OEN tH(L) l tGSW(ERROR) l LD i t(SU)ERROR tP4 G t s CLK A SDI DBit15 DBit14 DBit13 DBit12 DBitn DBit2 tDBit1 DBit0 Don’t Care New Data Input n s Don’t SDO TFLAG Undefineed TBit0 Care m Temperature Error Report Output tP4 t tP1 For detailed timing information see Timing Diagrams on page 8. n a Detailed Temperature Warning Report Example: o Consider a case where four AS1123s are cascaded in one chain. The detailed error report lists the temperatures for each device in the chain: IC1:[70°] IC2:[85°] IC3:[170°] IC4:[60°] c In this case, IC3 is overheated and will generate a global error, and therefore 4*16 clock cycles are needed to write out the detailed temperature warning report, and optionally read in new data. The deta iled temperature warning report would look like this: l XXXXXXXXXXXXXXX1 XXXXXXXXXXXXXXX1 XXXXXXXXXXXXXXX0 XXXXXXXXXXXXXXX1 a The 0 in the detailed temperature warning report indicates that IC3 is the device with the over-temperature condition. c Note: In an actual report there are no spaces in the output. i n h c e T www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 12 - 24

AS1123 Datasheet - Detailed Description Detailed Open-LED Error Report The detailed open-LED error report can be read out immediately after global error mode has been run. SDI must be 1 for the first device. Figure 15. Detailed Open-LED Error Report Timing Diagram Global Flag Readout Detailed Error Report Readout d OEN tTESTING i tH(L) l LD tSU(ERROR) a tGSW(ERROR) tP4 v tGSW(ERROR) CLK l tGSW(ERROR) l SDI Acquisition of Error Status tSW(ERROR) DBit15 DBit14 DBiNt1e3wDG BDita1 t2a IDnBpitunt DBit2 DBit1 DsBit0tiDCoanre’t Don’t SDO TFlag OFlag OBit15 OBAit14 OBit13 OBit12 OBitn OBit2 OBit1 OBit0 Care tP4 Open Error Report Output t tP1 For detailed timing information see Timing Diagrams on page 8. n s Detailed Open-LED Error Report Example: e Consider a case where three AS1123s are cascaded in omne chain. A 1 indicates a LED is on, a 0 indicates a LED is off, and an X indicates an open LED. The open-LED test is only applied to LEDs that are turned on. This test tis used with a test pattern where all LEDs are on at test time. IC1:[1111111111111111] IC2:[111XX11111111X11] IC3:[1111111111111111] n a IC2 has three open LEDs switched on due to input. 3*16 clock cycles are needed to write the entire error code out. The detailed error report o would look like this: Input Data: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1c1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 LED Status: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 XX1 1 1 1 1 1 1 1 X1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Failure Code: 1 1 1 1 1 1 1 1 1 1 1 1 1 1l1 1 1 1 1 0 0 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 a Comparing this report with the input data indicates that IC2 is the device with two open LEDs at position 4 and 5 and one open LED at position 14. For such a test it is recommended to enter low-current diagnostic mode first (see Low-Current Diagnostic Mode on page 14) to reduce screen c flickering. This test can be used also on-the-fly iwithout using an all 1s test pattern (see Figure 19 on page 16). n Note: In an actual report there are no spaces in the output. LEDs turned off during test time cannot be tested and will show a logic 1 in the detailed error report. h c e T www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 13 - 24

AS1123 Datasheet - Detailed Description Detailed Shorted-LED Error Report The detailed shorted-LED error report can be read out immediately after global error mode has been run (see Global Error Mode on page 10). SDI must be 1 for the first device. Figure 16. Detailed Shorted-LED Error Report Timing Diagram GGlloobbaall FFllaagg RReeaaddoouutt Detailed Error Report Readout d OEN i tTESTING l a LD tSU(ERROR) tH(L) v tGSW(ERROR) tP4 CLK tGSW(ERROR) l l tGSW(ERROR) i SDI Acquisition of Error Status tSW(ERROR) DBit15 DBit14 DBit1N3eDwGB iDt12ata DInBpitnut DBit2 DBit1 sDBit0t DCoanre’t SDO TTFFLLAAGG OFLAG SFLAG SBit15 SBitA14 SBit13 SBit12 SBitn SBit2 SBit1 SBit0 DCoanre’t t tP4 Shorted-LED Error Repornt Output tP1 For detailed timing information see Timing Diagrams on page 8s. e Detailed Shorted-LED Error Report Example m t Consider a case where three AS1123s are cascaded in one chain. A 1 indicates a LED is on, a 0 indicates a LED is off, and an X indicates a shorted LED. This test is used on-the-fly. n a IC1:[11111XX111111111] IC2:[1111111111111111] IC3:[X100011111111111] o IC1 has two shorted LEDs which are switched on, IC3 has one shorted LED switched off due to input. 3*16 clock cycles are needed to write the entire error code out. The detailed error report would look like thcis: Input Data: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 0 0 0 1 1 1 1 1 1 1 1 1 1 1 LED Status: 1 1 1 1 1 XX1 1 1 1 1 1 l1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 X1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 a Failure Code: 1 1 1 1 1 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 c Showing IC1 as the device with two shorted LEDs at position 6 and 7, and IC3 with one shorted LED at position 1. The shorted LED at position 1 of IC3 cannot be detected, since LEDs turned off at test time are not tested and will show a logic "1" at the detailed error report. To test all LEDs i this test should be run with an all 1s test pattern. For a test with an all on test pattern, low-current diagnostic mode should be entered first to n reduce on-screen flickering. Note: In an actual repohrt there are no spaces in the output. LEDs turned off during test time cannot be tested and will show a logic 1 in the detailed error report. c Low-Current Diagnostic Mode To run the open- or shorted-LED test, a test pattern must be used that will turn on each LED to be tested. This test pattern will cause a short e flicker on the screen while the test is being performed. The low-current diagnostic mode can be initiated prior to running a detailed error report to reduce this on-screen flickering. T Note: Normally, displays using such a diagnostic mode require additional cables, resistors, and other components to reduce the current. The AS1123 has this current-reduction capability built-in, thereby minimizing the number of external components required. Low-current diagnostic mode can be initiated via 3 clock pulses during error-detection mode. After the falling edge of LD, a test pattern displaying all 1s can be written to the shift register which will be used for the next error-detection test. On the next falling edge of OEN, current is reduced to ILC. With the next rising edge of OEN the current will immediately increase to normal lev- els and the detailed error report can be read out entering error-detection mode. www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 14 - 24

AS1123 Datasheet - Detailed Description Figure 17. Switching into Low-Current Diagnostic Mode Timing Diagram Low-Current Diagnosis Mode OEN tTESTING tSU(ERROR) Load Internal all 1s LD Test Pattern d (optional) tGSW(ERROR) tH(L) i l CLK a tGSW(ERROR) v tSW(ERROR) SDI Re-entering Error Detection Mode (see Figure 15 lon page 13) SDO TFLAG OFLAG SFLAG DCoanre’t (see Figure l16 on page 14) i tP1 G Normtal Operation Current For detailed timing information see Timing Diagrams on page 8. s VTHH Level A Two different threshold levels of the error detection can be set via a bit. The bit can be entered via 4 ctlock pulses during error-detection mode. To set level 2 (VTHH is 80% of Vdd) a 0 must be placed at SDI after th e rising edge of the 3rd clockn pulse. To set level 1 (VTHH is 54% of Vdd) a 1 must be placed at SDI asfter the 3rd clock pulse. The level 1/level 2 information will be latched through if multiple AS1123 devices are in a chain. At the rising edge of the 4th clock pulse the bit wilel be read out and the AS1123 is set to Level1 or Level2. m Figure 18. VTHH Level Timing Diagram t n a OEN o c LD tSU(ERROR) l a CLK c i n 1 = Level1 SDI 0 = Levle2 h 1 = Level1 c SDO TFLAG OFLAG SFLAG 0 = Level2 e tP4 tSU(D) T www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 15 - 24

AS1123 Datasheet - Application Information 9 Application Information Error Detection The AS1123 features two types of error detection. The error detection can be used on-the-fly, for active LEDs, without any delay, or by entering into low-current diagnosis mode. Error Detection On-The-Fly d Error detection on-the-fly will output the status of active LEDs during operation. Without choosing an error mode this will output the temperature i flag at every input/output cycle. Triggering one clock pulse for open or two clock pulses for short detection during error detection mode outputs l the detailed open- or short-error report with the next input/output cycle (see Figure 19). LEDs turned off at test time are not tested and will show a a logic "1" at the detailed error report. v Figure 19. Normal Operation with Error Detection During Operation – 64 Cascaded AS1123s Display Data1 Data2 Data3 l l SDI Data2 Data3 iData4 G t s T/O or S Error Code T/O or S Error Code T/O or S Error Code SDO GEF GEF Data0 Data1 Data2 A Clock for Error Clock for Error Mode 0x/1x/2x Mode 0x/1x/2xt CLK 1024x 1024x n 1024x s Rising Edge of OEN Rising Edge of OEN OEN Acquisition of Error Status Acquisition of Error Staetus m Falling Edge of LD; Ertror Regis- Falling Edge of LD; Error Regis- LD ter is copied into Shift Register ter is copied into Shift Register n a Current o£ 40mA GEF = Global Error Flag c Error Detection with Low-Current Diagnosis Mode This unique feature of the AS1123 uses an internal all 1s test pattern for a flicker free diagnosis of all LEDs. This error detection mode can be started at the end of each input cycle (see Figure 20).l a Figure 20. Low-Current Diagnosis Mode with Internal All 1s Test Pattern – 64 Cascaded AS1123s c Low-Current Diagnosis Mode Display Data0 i Data1 Data2 n SDI Data1 Data2 Data3 h T/O or S Error Code O or S Error Code from SDO GEF GEF GEF Temperature Error Code Data0 All 1s Test Pattern c 3x Clocks Low-Clock for Error Current Mode Mode 1x/2x CLK e 1024x 1024x 1024x Rising Edge of OEN OTEN Acquisition of Error Status Falling Edge LD; Error Register Use Internal All 1s LD Test Pattern is copied into Shift Register Current £ 40mA £ 40mA £ 0.8mA GEF = Global Error Flag www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 16 - 24

AS1123 Datasheet - Application Information The last pattern written into the shift register will be saved before starting low-current diagnosis mode and can be displayed immediately after the test has been performed. Low-current diagnostic mode is started with 3 clock pulses during error detection mode. Then OEN should be enabled for ‡ 2µs for testing. With the rising edge of OEN the LED test is stopped, and while LD is high the desired error mode can be selected with the corresponding clock pulses. After LD and OEN go low again the previously saved pattern can be displayed at the outputs. With the next data input the detailed error code will be clocked out at pin SDO. d Note: See Figure21 for use of an external test pattern. i Figure 21. Low-Current Diagnosis Mode with External Test Pattern – 64 Cascaded AS1123s l a Low-Current Diagnosis Mode Display Data1 Data2 v SDI External all 1s Test Pattern Data2 Data3 l SDO T/O or S Error Code GEF O or S Error Code GEF Temperatulre Error Code Data0 from Test Pattern 3x Clocks i LowM-Coudrerent CMloockd efo 1r xE/r2rxor G t CLK 1024x 1024x s 1024x OEN Rising EdAge of OEN Acquisition of Error Status t Falling Edge LD; Error Regis- LD n ter is copied into Shift Register s e Current £ 40mA m £ 40mA t £ 0.8mA n GEF = Global Error Flag a o Cascading Devices c To cascade multiple AS1123 devices, pin SDO must be connected to pin SDI of the next AS1123 (see Figure 22). At each rising edge of CLK the LSB of the shift register will be written into the shift register SDI of the next AS1123 in the chain. Note: When n*AS1123 devices are in one chain, n*16 clock pulses are needed to latch-in the input data. l a Figure 22. Cascading AS1123 Devices c i n SDI hAS1123 #1 AS1123 #2 AS1123 #n-1 SDI SDO SDI SDO SDI SDO c e CLK LD OEN CLK LD OEN CLK LD OEN CLK T LD OEN www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 17 - 24

AS1123 Datasheet - Application Information Constant Current In LED display applications, the AS1123 provides virtually no current variations from channel-to-channel and from AS1123-to-AS1123. This is mostly due to 2 factors: (cid:1) While IOUT ³ 10mA, the maximum current skew is less than ±3% between channels and less than ±3% between AS1123 devices. (cid:1) In the saturation region, the characteristic curve of the output stage is flat. Thus, the output current can be kept constant regardless of the variations of LED forward voltages (VF). d Adjusting Output Current i l The AS1123 scales up the reference current (IREF) set by external resistor (REXT) to sink a current (IOUT) at each output port. As shown the a output current in the saturation region is extremely flat so that it is possible to define it as target current (IOUT TARGET). IOUT TARGET can be calculated by: v VREXT = 1.253V (EQ 1) IREF = VREXT/REXT (if the other end of REXT is connected to ground) (EQ 2) IOUT TARGET = IREF*15 = (1.253V/REXT)*15 l (EQ 3) l Where: i REXT is the resistance of the external resistor connected to pin REXT. G t VREXT is the voltage on pin REXT. s The magnitude of current (as a function of REXT) is around 40mA at 470W and 20mA at 940W . A Package Power Dissipation t The maximum allowable package power dissipation (PD) is determ ined as: n s PD(MAX) = (TJ-TAMB)/RTH(J-A) (EQ 4) e When 16 output channels are turned on simultaneously, the actual package power dissipation is: m PD(ACT) = (IDD*VDD) + (IOUT*Duty*VtDS*16) (EQ 5) Therefore, to keep PD(ACT) £ PD(MAX), the maximum allowed output current nas a function of duty cycle is: a IOUT = {[(TJ-TAMB)/RTH(J-A)]-(IDD*VDD)}/VDS/Duty/16 (EQ 6) o Where: TJ = -40°C to +125°C c Delayed Outputs (only for AS1123B) The AS1123B has graduated delay circuits between olutputs. These delay circuits can be found between OUTNn and the constant current block. a The fixed delay time is 20 ns (typ) where OUTN0:3 has no delay, OUTN4:7 has 20ns delay, OUTN8:11 has 40ns delay and OUTN12:15 has 60ns delay. This delay prevents large inrush currents, which reduce power supply bypass capacitor requirements when the outputs turn on. c Switching-Noise Reduction i LED drivers are frequently used inn switch-mode applications which normally exhibit switching noise due to parasitic inductance on the PCB. Load Supply Voltaghe Considering the package power dissipation limits, the AS1123 should be operated within the range of VDS = 0.4 to 1.0V. c For example, if VLED is higher than 5V, VDS may be so high that PD(ACT) > PD(MAX) where VDS = VLED - VF. In this case, the lowest possible supply voltage or a voltage reducer (VDROP) should be used. The voltage reducer allows e VDS = (VLED -VF) - VDROP. NoteT: Resistors or zener diodes can be used as a voltage reducer as shown in Figure23 on page19. www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 18 - 24

AS1123 Datasheet - Application Information Figure 23. Voltage Reducer using Resistor (Left) and Zener Diode (Right) Voltage Supply Voltage Supply { } VDROP VLED VDROP VLED VF VDS VF VDS d i AS1123 l AS1123 a v l l i G t s A t n s e m t n a o c l a c i n h c e T www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 19 - 24

AS1123 Datasheet - Package Drawings and Markings 10 Package Drawings and Markings Figure 24. 24-pin QSOP Marking d i l a v l l i G t s Figure 25. 24-pin TQFN (4x4mm) Marking A t n s e m t n a o c Table 9. Packaging Code YYWWRZZ or YYWWXZZl a YY WW R / X ZZ c last two digits of the current year manufacturing week plant identifier free choice / traceability code i n h c e T www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 20 - 24

AS1123 Datasheet - Package Drawings and Markings Figure 26. 24-pin TQFN (4x4mm) Package d i l a v l l i G t s A t n s e m t n a o c l a c i n h c e T www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 21 - 24

AS1123 Datasheet Figure 27. 24-pin QSOP Package d i l a v l l i G t s A t n s e m t n a o c l a c i n h c e T www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 22 - 24

AS1123 Datasheet - Ordering Information 11 Ordering Information The device is available as the standard products shown in Table 10. Table 10. Ordering Information Ordering Code Marking Description Delivery Form Package d Constant-Current, 16-Channel LED Driver with AS1123-BQFT AS1123 Tape and Reel 24-pin TQFN (4x4mm) Diagnostics i Constant-Current, 16-Channel LED Driver with AS1123-BTST AS1123 Tape and Reel 24-pin QSOP l Diagnostics a Constant-Current, 16-Channel LED Driver with AS1123B* AS1123B Tape and Reel tbd Diagnostics with controlled inrush Current v *)on request Note: All products are RoHS compliant and austriamicrosystems green. l Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect l i Technical Support is found at http://www.austriamicrosystems.com/TechnicaGl-Support t s For further information and requests, please contact us mailto:sales@austriamicrosystems.com or find your local distributor at http://www.austriamicrosystems.comA/distributor t n s e m t n a o c l a c i n h c e T www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 23 - 24

AS1123 Datasheet Copyrights Copyright © 1997-2011, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. d Disclaimer i l Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. aus- a triamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at v any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specif- l ically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100 parts the l manufacturing flow might show deviations from the standard production flow, such as test flow or test location. i The information furnished here by austriamicrosystems AG is believed to be correct aGnd accurate. However, austritamicrosystemsAG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property dasmage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to rAecipient or any third party sh all arise or flow out of austriamicrosystemsAG rendering of technical or other services. t n s e m t n a o c l a c i Contact Information n Headquarters h austriamicrosystems AG Tobelbaderstrasse 30 c A-8141 Unterpremstaetten, Austria Tel: +43 (0) 3e136 500 0 Fax: +43 (0) 3136 525 01 T For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com/contact www.austriamicrosystems.com/LED-Driver-ICs Revision 1.00 24 - 24