CP2101 Single-Chip USB to UART Bridge Single-Chip USB to UART Data Transfer Virtual COM Port Device Drivers - Integrated USB Transceiver; No External Resistors - Works with Existing COM Port PC Applications Required - Royalty-Free Distribution License - Integrated Clock; No External Crystal Required - Windows Vista/XP/Server 2003/2000/98SE - Integrated 512-Byte EEPROM for Vendor ID, - Mac OS-X/OS-9 Product ID, Serial Number, Power Descriptor, - Linux 2.40 Release Number and Product Description Strings - On-Chip Power-On Reset Circuit USBXpress™ Direct Driver Support - On-Chip Voltage Regulator: 3.3 V Output - Royalty-Free Distribution License USB Function Controller - Windows Vista/XP/Server 2003/2000 - USB Specification 2.0 Compliant; Full Speed - Windows CE 6.0, 5.0, and 4.2 (12 Mbps) Example Applications - USB suspend states supported via SUSPEND pins - Upgrade of RS-232 Legacy Devices to USB Asynchronous Serial Data BUS (UART) - Cellular Phone USB Interface Cable - All Handshaking and Modem Interface Signals - PDA USB Interface Cable - Data Formats Supported: - USB to RS-232 Serial Adapter • Data Bits: 8 • Stop Bits: 1 Supply Voltage • Parity: Odd, Even, No Parity - Self-powered: 3.0 to 3.6 V - Baud Rates: 300 bps to 921.6 kbps - USB Bus Powered: 4.0 to 5.25 V - 512 Byte Receive Buffer; 512 Byte Transmit Buffer Package - Hardware or X-On / X-Off Handshaking Supported - Event Character Support - Pb-free 28-pin QFN (5 x 5 mm) Ordering Part Number - CP2101-GM Temperature Range: -40 to +85 °C  Note: The CP2101 is a mature product and is not rec- ommended for new designs. The CP2102 is a pin and software compatible alternative for the CP2101. The CP2102 is recommended for all new designs. CP2101 VDD 7 REGIN IN Voltage Regulator RST 9 OUT (to external circuitry SUSPEND 12 for USB suspend 6 VDD 3.3 V SUSPEND 11 states) 3 GND RI 2 CONUNSEBC TOR 8 VBUS O4s8c MillaHtoz r DDCTRD 128 EUtxrAtaenRrnsTca elc iRivrceSur- i2tor3ry 2 VBUS 1 UART DSR 27 D– 2 5 D– USB USB Function TXD 26 GNDD+ 34 4 D+ Transceiver Controller RXD 25 512B 512B 512B RTS 24 6 5 D1D2D3 EEPROM BuTfXfe r BRufXfe r CTS 23 Example System Diagram Rev. 1.8 5/07 Copyright © 2007 by Silicon Laboratories CP2101

CP2101 2 Rev. 1.8

1. SYSTEM OVERVIEW ........................................................................................................5 2. ABSOLUTE MAXIMUM RATINGS ...................................................................................5 Table 2.1. Absolute Maximum Ratings ...............................................................................5 3. GLOBAL DC ELECTRICAL CHARACTERISTICS ..........................................................6 Table 3.1. Global DC Electrical Characteristics ..................................................................6 Table 3.2. UART and Suspend I/O DC Electrical Characteristics ......................................6 Table 3.3. Reset Electrical Characteristics .........................................................................6 4. PINOUT AND PACKAGE DEFINITIONS ..........................................................................7 Table 4.1. Pin Definitions for the CP2101 ..........................................................................7 Figure 4.1. QFN-28 Pinout Diagram (Top View) ................................................................8 Figure 4.2. QFN-28 Package Drawing ...............................................................................9 Table 4.2. QFN-28 Package Dimensions ...........................................................................9 Figure 4.3. Typical QFN-28 Landing Diagram .................................................................10 Figure 4.4. Typical QFN-28 Solder Paste Recommendation ...........................................11 5. USB FUNCTION CONTROLLER AND TRANSCEIVER ................................................12 Figure 5.1. Typical Connection Diagram ..........................................................................12 6. ASYNCHRONOUS SERIAL DATA BUS (UART) INTERFACE .....................................13 Table 6.1. Data Formats and Baud Rates ........................................................................13 7. INTERNAL EEPROM ......................................................................................................13 Table 7.1. Default USB Configuration Data ......................................................................13 8. CP2101 DEVICE DRIVERS .............................................................................................14 8.1. Virtual COM Port Drivers ..........................................................................................14 8.2. USBXpress Drivers ..................................................................................................14 8.3. Driver Customization ................................................................................................14 8.4. Driver Certification ....................................................................................................14 9. VOLTAGE REGULATOR ................................................................................................15 Table 9.1. Voltage Regulator Electrical Specifications .....................................................15 Figure 9.1. Configuration 1: USB Bus-Powered ..............................................................15 Figure 9.2. Configuration 2: USB Self-Powered ..............................................................16 Figure 9.3. Configuration 3: USB Self-Powered, Regulator Bypassed ............................16 10.RELEVANT APPLICATION NOTES ...............................................................................17 Document Change List .......................................................................................................18 Rev. 1.8 3

4 Rev. 1.8

CP2101 1. System Overview The CP2101 is a highly-integrated USB-to-UART Bridge Controller providing a simple solution for updating RS-232 designs to USB using a minimum of components and PCB space. The CP2101 includes a USB 2.0 full-speed function controller, USB transceiver, oscillator, EEPROM and asynchronous serial data bus (UART) with full modem control signals in a compact 5 x 5 mm QFN-28 package. No other external USB components are required. The on-chip EEPROM may be used to customize the USB Vendor ID, Product ID, Product Description String, Power Descriptor, Device Release Number and Device Serial Number as desired for OEM applica- tions. The EEPROM is programmed on-board via the USB allowing the programming step to be easily inte- grated into the product manufacturing and testing process. Royalty-free Virtual COM Port (VCP) device drivers provided by Silicon Laboratories allow a CP2101- based product to appear as a COM port to PC applications. The CP2101 UART interface implements all RS-232 signals, including control and handshaking signals, so existing system firmware does not need to be modified. In many existing RS-232 designs, all that is required to update the design from RS-232 to USB is to replace the RS-232 level-translator with the CP2101. Direct access driver support is available through the Silicon Laboratories USBXpress driver set. The CP2101 is a mature product and is not recommended for new designs. The CP2102 is a pin and soft- ware compatible alternative for the CP2101. The CP2102 is recommended for all new designs. Contact Silicon Laboratories customer support at www.silabs.com for any questions about replacing the CP2101. 2. Absolute Maximum Ratings Table 2.1. Absolute Maximum Ratings Parameter Conditions Min Typ Max Units Ambient temperature under bias –55 — 125 °C Storage Temperature –65 — 150 °C Voltage on any I/O Pin or RST with respect to –0.3 — 5.8 V GND Voltage on V with respect to GND –0.3 — 4.2 V DD Maximum Total current through V and GND — — 500 mA DD Maximum output current sunk by RST or any  — — 100 mA I/O pin Note: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the devices at those or any other conditions above those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. Rev. 1.8 5

CP2101 3. Global DC Electrical Characteristics Table 3.1. Global DC Electrical Characteristics V = 3.0 to 3.6 V, –40 to +85 °C unless otherwise specified. DD Parameter Conditions Min Typ Max Units Supply Voltage 3.0 3.3 3.6 V Supply Current1 Normal Operation; — 22 26 mA V Enable REG Supply Current1 Suspended; — 78 200 µA V Enable REG Supply Current - USB Pull-up2 — 200 228 µA Specified Operating Temperature Range –40 — +85 °C Notes: 1. USB Pull-up Current should be added for total supply current. 2. The USB Pull-up supply current values are calculated values based on USB specifications. Table 3.2. UART and Suspend I/O DC Electrical Characteristics V = 3.0 to 3.6 V, -40 to +85 °C unless otherwise specified. DD Parameters Conditions Min Typ Max Units I = –3 mA V – 0.7 — — OH DD Output High Voltage I = –10 µA V – 0.1 — — V OH DD I = –10 mA — V – 0.8 — OH DD I = 8.5 mA — — 0.6 OL Output Low Voltage I = 10 µA — — 0.1 V OL I = 25 mA — 1.0 — OL Input High Voltage 2.0 — — V Input Low Voltage — — 0.8 V Input Leakage Current — 25 50 µA Table 3.3. Reset Electrical Characteristics -40°C to +85°C unless otherwise specified. Parameter Conditions Min Typ Max Units /RST Output Low Voltage I = 8.5 mA, — — 0.6 V OL VDD = 3.0 V to 3.6 V /RST Input High Voltage 0.7 x VDD — — V /RST Input Low Voltage — — 0.3 x VDD /RST Input Pull-Up Current /RST = 0.0 V — 25 40 µA Minimum /RST Low Time to 15 — — µs Generate a System Reset 6 Rev. 1.8

CP2101 4. Pinout and Package Definitions Table 4.1. Pin Definitions for the CP2101 Name Pin # Type Description V 6 Power In 3.0–3.6 V Power Supply Voltage Input. DD Power Out 3.3 V Voltage Regulator Output. See Section 9. GND 3 Ground RST 9 D I/O Device Reset. Open-drain output of internal POR or V monitor. An DD external source can initiate a system reset by driving this pin low for at least 15 µs. REGIN 7 Power In 5 V Regulator Input. This pin is the input to the on-chip voltage regula- tor. VBUS 8 D In VBUS Sense Input. This pin should be connected to the VBUS signal of a USB network. A 5 V signal on this pin indicates a USB network connection. D+ 4 D I/O USB D+ D– 5 D I/O USB D– TXD 26 D Out Asynchronous data output (UART Transmit) RXD 25 D In Asynchronous data input (UART Receive) CTS 23* D In Clear To Send control input (active low) RTS 24* D Out Ready to Send control output (active low) DSR 27* D in Data Set Ready control input (active low) DTR 28* D Out Data Terminal Ready control output (active low) DCD 1* D In Data Carrier Detect control input (active low) RI 2* D In Ring Indicator control input (active low) SUSPEND 12* D Out This pin is driven high when the CP2101 enters the USB suspend state. SUSPEND 11* D Out This pin is driven low when the CP2101 enters the USB suspend state. NC 10, 13–22 These pins should be left unconnected or tied to V . DD *Note: Pins can be left unconnected when not used. Rev. 1.8 7

CP2101 R R D D S S T S X X T T C D D T R R C N 8 7 6 5 4 3 2 GND 2 2 2 2 2 2 2 DCD 1 21 NC RI 2 20 NC GND 3 19 NC CP2101 D+ 4 18 NC Top View D- 5 17 NC V 6 16 NC DD GND REGIN 7 15 NC 0 1 2 3 4 8 9 1 1 1 1 1 S T C D D C C U S N N N N N B R E E V P P S S U U S S Figure 4.1. QFN-28 Pinout Diagram (Top View) 8 Rev. 1.8

CP2101 Figure 4.2. QFN-28 Package Drawing Table 4.2. QFN-28 Package Dimensions Dimension Min Nom Max Dimension Min Nom Max A 0.80 0.90 1.00 E2 2.90 3.15 3.35 A1 0.03 0.07 0.11 L 0.45 0.55 0.65 A3 0.25 REF aaa 0.15 b 0.18 0.25 0.30 bbb 0.10 D 5.00 BSC. ddd 0.05 D2 2.90 3.15 3.35 eee 0.08 e 0.50 BSC. Z 0.435 E 5.00 BSC. Y 0.18 Notes: 1. All dimensions shown are in millimeters (mm) unless otherwise noted. 2. Dimensioning and Tolerancing per ANSI Y14.5M-1994. 3. This drawing conforms to JEDEC outline MO-243, variation VHHD except for custom features D2, E2, L, Z, and Y which are toleranced per supplier designation. 4. Recommended card reflow profile is per the JEDEC/IPC J-STD-020C specification for Small Body Components. Rev. 1.8 9

CP2101 Figure 4.3. Typical QFN-28 Landing Diagram 10 Rev. 1.8

CP2101 Figure 4.4. Typical QFN-28 Solder Paste Recommendation Rev. 1.8 11

CP2101 5. USB Function Controller and Transceiver The Universal Serial Bus function controller in the CP2101 is a USB 2.0 compliant full-speed device with integrated transceiver and on-chip matching and pull-up resistors. The USB function controller manages all data transfers between the USB and the UART as well as command requests generated by the USB host controller and commands for controlling the function of the UART. The USB Suspend and Resume signals are supported for power management of both the CP2101 device as well as external circuitry. The CP2101 will enter Suspend mode when Suspend signaling is detected on the bus. On entering Suspend mode, the CP2101 asserts the SUSPEND and SUSPEND signals. SUSPEND and SUSPEND are also asserted after a CP2101 reset until device configuration during USB Enumeration is complete The CP2101 exits the Suspend mode when any of the following occur: (1) Resume signaling is detected or generated, (2) a USB Reset signal is detected, or (3) a device reset occurs. On exit of Suspend mode, the SUSPEND and SUSPEND signals are de-asserted. Both SUSPEND and SUSPEND temporarily float high during a CP2101 reset. If this behavior is undesir- able, a strong pulldown (10 k) can be used to ensure SUSPEND remains low during reset. See Figure 5.1 for other recommended options. VDD CP2101 R1 4.7 k Option 1 7 REGIN C1 9 1 F RST (to external circuitry SUSPEND 12 for USB suspend states) 6 11 VDD SUSPEND C4 C2 R2 4.7 F 0.1 F 3 GND 2 10 k Option 4 RI Option 2 1 8 DCD External RS-232 USB VBUS 28 transceiver or CONNECTOR DTR UART circuitry 27 VBUS 1 DSR D- 2 5 D- TXD 26 D+ 3 GND 4 4 D+ RXD 25 24 RTS 6 5 D1 D2 D3 Option 3 CTS 23 Option 1: A 4.7 k pull-up resistor can be added to increase noise immunity. Option 2: A 4.7 F capacitor can be added if powering other devices from the on-chip regulator. Option 3: Avalanche transient voltage suppression diodes can be added for ESD protection. Option 3: Use Littlefuse p/n SP0503BAHT or equivalent. Option 4: 10 k resistor to ground to hold SUSPEND low on initial power on or device reset. Figure 5.1. Typical Connection Diagram 12 Rev. 1.8

CP2101 6. Asynchronous Serial Data Bus (UART) Interface The CP2101 UART interface consists of the TX (transmit) and RX (receive) data signals as well as the RTS, CTS, DSR, DTR, DCD and RI control signals. The UART supports RTS/CTS, DSR/DTR and X-On/X- Off handshaking. The UART is programmable to support a variety of data formats and baud rates. If the Virtual COM Port drivers are used, the data format and baud rate are set during COM port configuration on the PC. If the USBXpress drivers are used, the CP2101 is configured through the USBXpress API. The data formats and baud rates available are listed in Table 6.1. Table 6.1. Data Formats and Baud Rates Data Bits 8 Stop Bits 1 Parity Type None, Even, Odd 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, Baud Rates 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 7. Internal EEPROM The CP2101 includes an internal EEPROM that may be used to customize the USB Vendor ID (VID), Prod- uct ID (PID), Product Description String, Power Descriptor, Device Release Number and Device Serial Number as desired for OEM applications. If the EEPROM is not programmed with OEM data, the default configuration data shown in Table 7.1 is used. While customization of the USB configuration data is optional, it is recommended to customize the VID/PID combination. A unique VID/PID combination will prevent the driver from conflicting with any other USB driver. A vendor ID can be obtained from www.usb.org or Silicon Laboratories can provide a free PID for the OEM product that can be used with the Silicon Laboratories VID. It is also recommended to customize the serial number if the OEM application is one in which it is possible for multiple CP2101-based devices to be connected to the same PC. The internal EEPROM is programmed via the USB. This allows the OEM's USB configuration data and serial number to be written to the CP2101 on-board during the manufacturing and testing process. A stand-alone utility for programming the internal EEPROM is available from Silicon Laboratories. A library of routines provided in the form of a Windows® DLL is also available. This library can be used to integrate the EEPROM programming step into custom software used by the OEM to streamline testing and serial num- ber management during manufacturing. The EEPROM has a typical endurance of 100,000 write cycles with a data retention of 100 years. Table 7.1. Default USB Configuration Data Name Value Vendor ID 10C4h Product ID EA60h Power Descriptor (Attributes) 80h Power Descriptor (Max. Power) 32h Release Number 0100h Rev. 1.8 13

CP2101 Table 7.1. Default USB Configuration Data (Continued) Name Value Serial Number 0001 (63 characters maximum) Product Description String “CP2101 USB to UART Bridge Controller” (126 characters maximum) 8. CP2101 Device Drivers There are two sets of device drivers available for the CP2101 devices: the Virtual COM Port (VCP) drivers and the USBXpress Direct Access drivers. Only one set of drivers is necessary to interface with the device. The latest drivers are available at http://www.silabs.com/products/microcontroller/downloads.asp. 8.1. Virtual COM Port Drivers The CP2101 Virtual COM Port (VCP) device drivers allow a CP2101-based device to appear to the PC's application software as a COM port. Application software running on the PC accesses the CP2101-based device as it would access a standard hardware COM port. However, actual data transfer between the PC and the CP2101 device is performed over the USB interface. Therefore, existing COM port applications may be used to transfer data via the USB to the CP2101-based device without modifying the application. See Application Note AN197: Code for Example Code for Interfacing to a CP2102 using the Virtual COM drivers. 8.2. USBXpress Drivers The Silicon Laboratories USBXpress drivers provide an alternate solution for interfacing with CP2102 devices. No Serial Port protocol expertise is required. Instead, a simple, high-level application program interface (API) is used to provide simpler CP201x connectivity and functionality. The USBXpress for CP210x Development Kit includes Windows device drivers, Windows device driver installer and uninstall- ers, and a host interface function library (host API) provided in the form of a Windows Dynamic Link Library (DLL). The USBXpress driver set is recommended for new products that also include new PC soft- ware. The USBXpress interface is described in Application Note “AN169: USBXpress Programmer's Guide.” 8.3. Driver Customization In addition to customizing the device as described in Section 7. "Internal EEPROM" on page 13, the driv- ers and the drivers installation package can be also be customized. See Application Note “AN220: USB Driver Customization” for more information on generating customized VCP and USBXpress drivers. 8.4. Driver Certification The default drivers that are shipped with the CP2101 are Microsoft WHQL (Windows Hardware Quality Labs) certified. The certification means that the drivers have been tested by Microsoft and their latest operating systems (XP and Vista) will allow the drivers to be installed without any warnings or errors. The customized drivers that are generated using the AN220 software are not automatically certified. They must go first through the Microsoft Driver Reseller Submission process. Contact Silicon Laboratories sup- port for assistance with this process. 14 Rev. 1.8

CP2101 9. Voltage Regulator The CP2101 includes an on-chip 5-to-3 V voltage regulator. This allows the CP2101 to be configured as either a USB bus-powered device or a USB self-powered device. These configurations are shown in Figure 9.1 and Figure 9.2. When enabled, the 3 V voltage regulator output appears on the V pin and can DD be used to power external 3V devices. See Table 9.1 for the voltage regulator electrical characteristics. Alternatively, if 3 V power is supplied to the V pin, the CP2101 can function as a USB self-powered DD device with the voltage regulator disabled. For this configuration, it is recommended that the REGIN input be tied to the 3 V net to disable the voltage regulator. This configuration is shown in Figure 9.3. The USB max power and power attributes descriptor must match the device power usage and configura- tion. See application note “AN144: CP2101 Customization Guide” for information on how to customize USB descriptors for the CP2101. Note: It is recommended that additional decoupling capacitance (e.g., 0.1 µF in parallel with 1.0 µF) be pro- vided on the REGIN input. Table 9.1. Voltage Regulator Electrical Specifications –40 to +85 °C unless otherwise specified. Parameter Conditions Min Typ Max Units Input Voltage Range 4.0 — 5.25 V Output Voltage Output Current = 1 to 100 mA* 3.0 3.3 3.6 V VBUS Detection Input Threshold 1.0 1.8 4.0 V Bias Current — 90 TBD µA *Note: The maximum regulator supply current is 100 mA. CP2101 VBUS From VBUS VBUS Sense REGIN 5 V In Voltage Regulator (REG0) 3 V Out To 3 V VDD Device Power Net Power Net Figure 9.1. Configuration 1: USB Bus-Powered Rev. 1.8 15

CP2101 CP2101 VBUS From VBUS VBUS Sense From 5 V REGIN 5 V In Voltage Regulator (REG0) Power Net 3 V Out To 3V VDD Device Power Net Power Net Figure 9.2. Configuration 2: USB Self-Powered CP2101 VBUS From VBUS VBUS Sense REGIN 5 V In Voltage Regulator (REG0) 3 V Out From 3 V VDD Device Power Net Power Net Figure 9.3. Configuration 3: USB Self-Powered, Regulator Bypassed 16 Rev. 1.8

CP2101 10. Relevant Application Notes The following Application Notes are applicable to the CP2101. The latest versions of these application notes and their accompanying software are available at: http://www.silabs.com/products/microcontroller/applications.asp. AN144: CP210x Device Customization Guide. This application note describes how to use the AN144 software to configure the USB parameters on the CP2101 devices. AN169: USBXpress Programmer's Guide. This application note describes the USBXpress API interface and includes example code. AN197: Serial Communications Guide for the CP210x. This application note describes how to use the standard Windows COM port function to communicate with the CP2101 and includes example code. AN220: CP210x USB Driver Customization. This application note describes how to use the AN220 soft- ware to customize the VCP or USBXpress drivers with OEM information. Rev. 1.8 17

CP2101 DOCUMENT CHANGE LIST Revision 1.6 to Revision 1.7  Updated “Linux 2.40” bullet on page 1.  Changed MLP to QFN throughout. Revision 1.7 to Revision 1.71  Removed “Windows CE” bullet from page 1. Revision 1.71 to Revision 1.8  Added note on pages 1 and 4 regarding CP2101 not recommend for new designs.  Added additional supported operating systems on page 1.  Changed VDD conditions of Tables 3.1 and 3.2 from a minimum of 2.7 to 3.0 V.  Added values to Table 3.1, “Global DC Electrical Characteristics,” on page 6.  Updated package drawings in Figure 4.2, Figure 4.3, and Figure 4.4.  Changed Figure 4.4 title.  Removed tantalum requirement in Figure 5.1.  Updated Section 8. "CP2101 Device Drivers" on page 14 with USBXpress, customization, and certification information.  Added Section 10. "Relevant Application Notes" on page 17. 18 Rev. 1.8

Simplicity Studio One-click access to MCU and wireless tools, documentation, software, source code libraries & more. Available for Windows, Mac and Linux! IoT Portfolio SW/HW Quality Support and Community www.silabs.com/IoT www.silabs.com/simplicity www.silabs.com/quality community.silabs.com Disclaimer Silicon Labs intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers using or intending to use the Silicon Labs products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific device, and "Typical" parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. Silicon Labs reserves the right to make changes without further notice and limitation to product information, specifications, and descriptions herein, and does not give warranties as to the accuracy or completeness of the included information. Silicon Labs shall have no liability for the consequences of use of the information supplied herein. This document does not imply or express copyright licenses granted hereunder to design or fabricate any integrated circuits. The products are not designed or authorized to be used within any Life Support System without the specific written consent of Silicon Labs. A "Life Support System" is any product or system intended to support or sustain life and/or health, which, if it fails, can be reasonably expected to result in significant personal injury or death. Silicon Labs products are not designed or authorized for military applications. Silicon Labs products shall under no circumstances be used in weapons of mass destruction including (but not limited to) nuclear, biological or chemical weapons, or missiles capable of delivering such weapons. Trademark Information Silicon Laboratories Inc.® , Silicon Laboratories®, Silicon Labs®, SiLabs® and the Silicon Labs logo®, Bluegiga®, Bluegiga Logo®, Clockbuilder®, CMEMS®, DSPLL®, EFM®, EFM32®, EFR, Ember®, Energy Micro, Energy Micro logo and combinations thereof, "the world’s most energy friendly microcontrollers", Ember®, EZLink®, EZRadio®, EZRadioPRO®, Gecko®, ISOmodem®, Precision32®, ProSLIC®, Simplicity Studio®, SiPHY®, Telegesis, the Telegesis Logo®, USBXpress® and others are trademarks or registered trademarks of Silicon Labs. ARM, CORTEX, Cortex-M3 and THUMB are trademarks or registered trademarks of ARM Holdings. Keil is a registered trademark of ARM Limited. All other products or brand names mentioned herein are trademarks of their respective holders. Silicon Laboratories Inc. 400 West Cesar Chavez Austin, TX 78701 USA http://www.silabs.com

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