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CP2102 SINGLE-CHIP USB TO UART BRIDGE Single-Chip USB to UART Data Transfer Virtual COM Port Device Drivers Integrated USB transceiver; no external resistors required Integrated clock; no external crystal required Integrated 1024-Byte EEPROM for vendor ID, product ID, serial number, power descriptor, release number, and product description strings On-chip power-on reset circuit On-chip voltage regulator: 3.3 V output 100% pin and software compatible with CP2101 USB Function Controller USB Specification 2.0 compliant; full-speed (12 Mbps) USB suspend states supported via SUSPEND pins Asynchronous Serial Data BUS (UART) All handshaking and modem interface signals Data formats supported: - Data bits: 5, 6, 7, and 8 - Stop bits: 1, 1.5, and 2 - Parity: odd, even, mark, space, no parity Baud rates: 300 bps to 1 Mbits 576 Byte receive buffer; 640 byte transmit buffer Hardware or X-On/X-Off handshaking supported Event character support Line break transmission Works with existing COM Port PC applications Royalty-free distribution license Windows 98 SE/2000/XP MAC OS-9 MAC OS-X Linux 2.40 USBXpress™ Direct Driver Support Example Applications Upgrade of RS-232 legacy devices to USB Cellular phone USB interface cable PDA USB interface cable USB to RS-232 serial adapter Supply Voltage Self-powered: 3.0 to 3.6 V USB bus powered: 4.0 to 5.25 V Package Lead free 28-pin QFN (5 x 5 mm) Ordering Part Number CP2102-GM Temperature Range: –40 to +85 °C CP2102 VDD (to external circuitry for USB suspend states) External RS-232 transceiver or UART circuitry RST SUSPEND SUSPEND RI DCD DTR DSR TXD RXD RTS CTS 9 12 11 2 1 28 27 26 25 24 23 7 6 3 8 5 4 REGIN VDD GND VBUS D- D+ USB CONNECTOR 1 2 3 GND 4 VBUS D- D+ 56 D1 D2 D3 IN Voltage Regulator OUT 3.3 V 48 MHz Oscillator USB Transceiver USB Function Controller 1024B EEPROM 640B TX Buffer 576B RX Buffer UART Figure 1. Example System Diagram Rev. 1.1 9/05 Copyright © 2005 by Silicon Laboratories CP2102

CP2102 2 Rev. 1.1

TABLE OF CONTENTS CP2102 Page Section 1. System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 2. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 3. Global DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 4. Pinout and Package Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 5. USB Function Controller and Transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 6. Asynchronous Serial Data Bus (UART) Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 7. Internal EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 8. Virtual Com Port Device Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 9. USBXpress Direct Driver Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 10. Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 Rev. 1.1 3

CP2102 1. System Overview The CP2102 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 CP2102 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 applications. The EEPROM is programmed on-board via the USB allowing the programming step to be easily integrated into the product manufacturing and testing process. Royalty-free Virtual COM Port (VCP) device drivers provided by Silicon Laboratories allow a CP2102-based product to appear as a COM port to PC applications. The CP2102 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 CP2102. An evaluation kit for the CP2102 (Part Number: CP2102EK) is available. It includes a CP2102-based USB-to- UART/RS-232 evaluation board, a complete set of VCP device drivers, USB and RS-232 cables, and full documentation. Contact a Silicon Labs’ sales representatives or go to www.silabs.com to order the CP2102 Evaluation Kit. 4 Rev. 1.1

2. Absolute Maximum Ratings Table 1. Absolute Maximum Ratings CP2102 Conditions Parameter Ambient temperature under bias Storage Temperature Voltage on any I/O Pin or RST with respect to GND Voltage on VDD with respect to GND Maximum Total current through VDD and GND Maximum output current sunk by RST or any I/O pin Note: Stresses above those listed may cause permanent damage to the device. This is a stress rating only, and functional Units °C °C V V mA mA Min –55 –65 –0.3 –0.3 — — Typ — — — — — — Max 125 150 5.8 4.2 500 100 operation of the devices at or exceeding the conditions in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. 3. Global DC Electrical Characteristics Table 2. Global DC Electrical Characteristics VDD = 2.7 to 3.6 V, –40 to +85 °C unless otherwise specified. Parameter Supply Voltage Supply Current Supply Current in Suspend Specified Operating Temperature Range Conditions VDD = 3.3 V VDD = 3.3 V Min 3.0 — — –40 Typ 3.3 26 330 — Max 3.6 — — +85 Units V mA µA °C Table 3. UART and Suspend I/O DC Electrical Characteristics VDD = 2.7 to 3.6 V, –40 to +85 °C unless otherwise specified. Parameters Output High Voltage Output Low Voltage Input High Voltage Input Low Voltage Input Leakage Current Conditions IOH = –3 mA IOH = –10 µA IOH = –10 mA IOL = 8.5 mA IOL = 10 µA IOL = 25 mA Min VDD – 0.7 VDD – 0.1 — — — — 2.0 — — Typ — — VDD – 0.8 — — 1.0 — — 25 Max — — — 0.6 0.1 — — 0.8 50 UNITS V V V V µA Rev. 1.1 5

CP2102 4. Pinout and Package Definitions Name VDD GND RST REGIN VBUS D+ D– TXD RXD CTS RTS DSR DTR DCD RI SUSPEND SUSPEND Table 4. CP2102 Pin Definitions Pin # Type Description 6 3 9 7 8 4 5 26 25 23* 24* 27* 28* 1* 2* 12* 11* Power In 3.0–3.6 V Power Supply Voltage Input. Power Out 3.3 V Voltage Regulator Output. See Section 10. Ground D I/O Power In D In D I/O D I/O Device Reset. Open-drain output of internal POR or VDD monitor. An external source can initiate a system reset by driving this pin low for at least 15 µs. 5 V Regulator Input. This pin is the input to the on-chip voltage reg- ulator. VBUS Sense Input. This pin should be connected to the VBUS sig- nal of a USB network. A 5 V signal on this pin indicates a USB net- work connection. USB D+ USB D– D Out Asynchronous data output (UART Transmit) D In D In Asynchronous data input (UART Receive) Clear To Send control input (active low) D Out Ready to Send control output (active low) D in Data Set Ready control input (active low) D Out Data Terminal Ready control output (active low) D In D In D Out D Out Data Carrier Detect control input (active low) Ring Indicator control input (active low) This pin is driven high when the CP2102 enters the USB suspend state. This pin is driven low when the CP2102 enters the USB suspend state. These pins should be left unconnected or tied to VDD. NC 10, 13–22 *Note: Pins can be left unconnected when not used. 6 Rev. 1.1

CP2102 R T D R S D D X T D X R S T R S T C C N 8 2 7 2 6 2 5 2 4 2 3 2 2 2 21 20 19 18 17 16 15 NC NC NC NC NC NC NC CP2102 Top View GND GND DCD RI GND D+ D- VDD REGIN 1 2 3 4 5 6 7 98 0 1 1 1 2 1 3 1 4 1 S U B V T S R C N C N C N D N E P S U S D N E P S U S Figure 2. QFN-28 Pinout Diagram (Top View) Rev. 1.1 7

CP2102 b e L 7 6 5 4 3 2 1 Bottom View 0 8 9 1 1 1 2 1 3 1 4 1 D2 D2 2 2 E R 2 E 2 DETAIL 1 8 2 7 2 6 2 5 2 4 2 3 2 2 2 6 x e D Side View 15 16 17 18 19 20 21 e x 6 E A A1 A2 A3 b D D2 E E2 e L N ND NE R AA BB CC DD Table 5. QFN-28 Package MIN 0.80 Dimensions MM TYP MAX 1.00 0.90 0.02 0.05 0 1.00 0.65 0 — 0.25 — 0.30 0.23 0.18 5.00 — — 3.35 3.15 2.90 — 5.00 — 3.35 3.15 2.90 0.5 — — 0.65 0.55 0.45 — 28 — 7 — — — 7 — 0.09 — — — 0.435 — — 0.435 — — — — — 0.18 0.18 3 A DETAIL 1 A 1 A 2 A e AA CC B B D D Figure 3. QFN-28 Package Drawing 8 Rev. 1.1

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