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CP2102/9

SINGLE-CHIP USB-TO-UART BRIDGE

Single-Chip USB to UART Data Transfer

Integrated USB transceiver; no external resistors

required

- Integrated clock; no external crystal required

- Internal 1024-byte programmable ROM for vendor ID,

product ID, serial number, power descriptor, release

number, and product description strings

- EEPROM (CP2102)

- EPROM (One-time programmable) (CP2109)

- On-chip power-on reset circuit

- On-chip voltage regulator

- 3.3 V output (CP2102)

- 3.45 V output (CP2109)

- 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 Mbps

- 576 Byte receive buffer; 640 byte transmit buffer

- Hardware or X-On/X-Off handshaking supported

- Event character support

- Line break transmission

Virtual COM Port Device Drivers

Works with existing COM port PC Applications

- Royalty-free distribution license

- Windows 8/7/Vista/Server 2003/XP/2000

- Mac OS-X/OS-9

- Linux

USBXpress™ Direct Driver Support

Royalty-Free Distribution License

- Windows 7/Vista/XP/Server 2003/2000

- Windows CE

Example Applications

Upgrade of RS-232 legacy devices to USB

- Cellular phone USB interface cable

- 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

RoHS-compliant 28-pin QFN (5x5 mm)

Ordering Part Numbers

CP2102-GM

- CP2109-A01-GM

Temperature Range: –40 to +85 °C

Figure 1. Example System Diagram

CP2102/9

3.3 – 3.45 V

Voltage

Regulator

48 MHz

Oscillator

OUT

SUSPEND

REGIN

GND

RST

D+

D-

UART

DCD

CTS

RTS

RXD

TXD

DSR

DTR

External

RS-232

transceiver

or UART

circuitry

(to external

circuitry for

USB

suspend

states)

VBUS

D-

D+

GND

USB

CONNECTOR

VDD

VBUS

USB Function

Controller

USB

Transceiver

640B

Buffer

576B

Buffer

1024B

PROM

VDD

D1 D2 D3

VPP

*CP2109 only

For newer designs, the CP2102N devices offer compatible footprints and are recommended for use instead

of the CP2102/9. See the Silicon Labs website (www.silabs.com/usbxpress) for more information.

Summary of content (26 pages)

PAGE 1
CP2102/9 SINGLE-CHIP USB-TO-UART BRIDGE For newer designs, the CP2102N devices offer compatible footprints and are recommended for use instead of the CP2102/9. See the Silicon Labs website (www.silabs.com/usbxpress) for more information.
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CP2102/9 2 Rev. 1.
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CP2102/9 TABLE OF CONTENTS Section Page 1. System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 2. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 3. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 4. Pinout and Package Definitions . . . . . . . . . . . . . . . . . . .
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CP2102/9 1. System Overview The CP2102/9 is a highly-integrated USB-to-UART Bridge Controller providing a simple solution for updating RS232 designs to USB using a minimum of components and PCB space. The CP2102/9 includes a USB 2.0 fullspeed function controller, USB transceiver, oscillator, EEPROM or EPROM, 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.
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CP2102/9 2. Ordering Information Table 1. Product Selection Guide Ordering Part Number Internal EEPROM EPROM Programmable ROM (Byte) Calibrated Internal 48 MHz Oscillator Supply Voltage Regulator Lead-free (RoHSCompliant) Package CP2102-GM* 1024 Y N Y Y Y QFN28 CP2109-A01-GM* 1024 N Y Y Y Y QFN28 *Note: Pin compatible with the CP2101-GM. Rev. 1.
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CP2102/9 3. Electrical Specifications Table 2. Absolute Maximum Ratings Parameter Symbol Test Condition Min Typ Max Unit Ambient Temperature under Bias TBIAS –55 — 125 °C Storage Temperature TSTG –65 — 150 °C Voltage on VDD with respect to GND VDD –0.3 — 4.2 V Maximum Total Current through VDD and GND — — 500 mA Maximum Output Current sunk by RST or any I/O pin — — 100 mA –0.3 — 5.8 V –0.3 –0.3 — — 5.8 VDD + 3.
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CP2102/9 Table 3. Recommended Operating Conditions VDD = 3.0 to 3.6 V, –40 to +85 °C unless otherwise specified Parameter Symbol Test Condition Min Typ Max Unit Supply Voltage VDD 3.0 3.3 3.
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CP2102/9 Table 4. UART and Suspend I/O DC Electrical Characteristics VDD = 3.0 to 3.6 V, –40 to +85 °C unless otherwise specified Parameter Symbol Test Condition Min Typ Max Unit — — 921600 bps — 25 50 µA VOH IOH = –10 µA IOH = –3 mA IOH = –10 mA VDD – 0.1 VDD – 0.7 — — — VDD – 0.8 — — — V VOL IOL = 10 µA IOL = 8.5 mA IOL = 25 mA — — — — — 1.0 0.1 0.6 — V Baud Rate IL Input Leakage Current CP2102 Output High Voltage Output Low Voltage Input High Voltage VIH 2.
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CP2102/9 Table 6. Voltage Regulator Electrical Specifications –40 to +85 °C unless otherwise specified. Parameter Symbol Test Condition Min Typ Max Unit 4.0 — 5.25 V 3.0 3.3 3.6 V 1.0 1.8 2.9 V — 90 — µA 3.0 — 5.25 V 3.3 3.45 3.6 V 2.
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CP2102/9 Table 8. EPROM Electrical Characteristics Parameter Test Condition Min Typ Max Unit VDD > 3.3 V 5.75 — VDD + 3.6 V — 4.7 — µF CP2109 Voltage on VPP with respect to GND during a ROM programming operation Capacitor on VPP for In-system Programming 10 Rev. 1.
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CP2102/9 4. Pinout and Package Definitions Table 9. CP2102/9 Pin Definitions Name Pin # Type VDD 6 Power In Description 3.0–3.6 V Power Supply Voltage Input. Power Out 3.3 V Voltage Regulator Output. See "10. Voltage Regulator" on page 19. GND 3 RST 9 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. REGIN 7 Power In 5 V Regulator Input.
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DTR DSR TXD RXD RTS CTS NC 28 27 26 25 24 23 22 CP2102/9 DCD 1 21 NC RI 2 20 NC GND 3 19 NC D+ 4 18 NC / VPP D- 5 17 NC VDD 6 16 NC REGIN 7 15 NC CP2102/9 Top View 12 13 14 SUSPEND NC NC 10 NC 11 9 RST SUSPEND 8 VBUS GND Figure 2. QFN-28 Pinout Diagram (Top View) 12 Rev. 1.
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CP2102/9 5. QFN-28 Package Specifications Figure 3. QFN-28 Package Drawing Table 10. QFN-28 Package Dimensions Dimension Min Typ Max Dimension Min Typ Max A A1 A3 b D D2 e E E2 0.80 0.00 0.90 0.02 0.25 REF 0.23 5.00 BSC. 3.15 0.50 BSC. 5.00 BSC. 3.15 1.00 0.05 L L1 aaa bbb ddd eee Z Y 0.35 0.00 0.55 — 0.15 0.10 0.05 0.08 0.44 0.18 0.65 0.15 0.18 2.90 2.90 0.30 3.35 3.35 Notes: 1. All dimensions shown are in millimeters (mm) unless otherwise noted. 2.
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CP2102/9 Figure 4. QFN-28 Recommended PCB Land Pattern Table 11. QFN-28 PCB Land Pattern Dimensions Dimension C1 C2 E X1 Min Max Dimension Min Max X2 Y1 Y2 3.20 0.85 3.20 3.30 0.95 3.30 4.80 4.80 0.50 0.20 0.30 Notes: General 1. All dimensions shown are in millimeters (mm) unless otherwise noted. 2. Dimensioning and Tolerancing is per the ANSI Y14.5M-1994 specification. 3. This Land Pattern Design is based on the IPC-7351 guidelines. Solder Mask Design 4.
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CP2102/9 6. USB Function Controller and Transceiver The Universal Serial Bus function controller in the CP2102/9 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.
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CP2102/9 7. Asynchronous Serial Data Bus (UART) Interface The CP2102/9 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.
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CP2102/9 8. Internal Programmable ROM The CP2102 includes an internal electrically erasable programmable read-only memory (EEPROM), and the CP2109 includes an internal one-time programmable (OTP) erasable programmable read-only memory (EPROM). Either may be used to customize the USB Vendor ID (VID), Product ID (PID), Product Description String, Power Descriptor, Device Release Number and Device Serial Number as desired for OEM applications.
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CP2102/9 9. CP2102/9 Device Drivers There are two sets of device drivers available for the CP2102/9 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/support/Pages/software-downloads.aspx. 9.1.
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CP2102/9 10. Voltage Regulator The CP2102/9 includes an on-chip 5 to 3 V voltage regulator. This allows the CP2102/9 to be configured as either a USB bus-powered device or a USB self-powered device. These configurations are shown in Figure 6, Figure 7, Figure 8, Figure 9, and Figure 10. When enabled, the 3 V voltage regulator output appears on the VDD pin and can be used to power external 3 V devices. See Table 6 for the voltage regulator electrical characteristics.
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CP2102/9 CP2102 VBUS From VBUS VBUS Sense REGIN From 5 V Power Net 1.0 F 5 V In 0.1 F Voltage Regulator (REG0) 3 V Out VDD To 3V Power Net 4.7 F Device Power Net 0.1 F Figure 7. CP2102 Configuration 2: USB Self-Powered CP2109 From VBUS 24 k Note 1 (Optional) VBUS 47 k VBUS Sense REGIN From 5 V Power Net 1.0 F 5 V In 0.1 F Voltage Regulator (REG0) 3 V Out VDD To 3V Power Net 4.7 F Device Power Net 0.
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CP2102/9 CP2102 VBUS From VBUS VBUS Sense REGIN 1.0 F 5 V In 0.1 F Voltage Regulator (REG0) 3 V Out VDD From 3 V Power Net 4.7 F Device Power Net 0.1 F Figure 9. CP2102 Configuration 3: USB Self-Powered, Regulator Bypassed CP2109 From VBUS 24 k Note 1 (Optional) VBUS 47 k VBUS Sense REGIN 1.0 F 5 V In 0.1 F Voltage Regulator (REG0) 3 V Out VDD From 3 V Power Net 4.7 F Device Power Net 0.
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CP2102/9 11. Porting Considerations from CP2102 to CP2109 This section highlights the differences between the CP2102 and CP2109. These devices are designed to be pincompatible, and thus require very minor changes when porting hardware between devices. The CP2109 is an updated, cost-reduced version of the CP2102 with a one-time programmable ROM. 11.1.
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CP2102/9 Table 15. Differences in Electrical Specifications between CP2102 and CP2109 (Continued) Parameter Symbol Test Condition CP2102 CP2109 Unit RST Input High Voltage, Minimum VIHRESET 0.7 x VDD 0.75 x VDD V RST Input Low Voltage, Maximum VILRESET 0.25 x VDD 0.6 V Regulator Input Voltage Range, Minimum VREGIN 4.0 3.0 V Regulator Output Voltage, Minimum VDDOUT Output Current = 1 to 100 mA* 3.0 3.3 V Regulator Output Voltage, Typical VDDOUT Output Current = 1 to 100 mA* 3.
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CP2102/9 12. Relevant Application Notes The following application notes are applicable to the CP2102/9. The latest versions of these application notes and their accompanying software are available at: http://www.silabs.com/products/mcu/Pages/ApplicationNotes.aspx. AN169: USBXpress® Programmer's Guide—This application note describes the USBXpress API interface and includes example code.
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CP2102/9 DOCUMENT CHANGE LIST  Revision 1.0 to Revision 1.1    Updated “Linux 2.40” bullet on page 1.  Changed MLP to QFN throughout.   Revision 1.1 to Revision 1.2        Added additional supported operating systems on page 1. Changed VDD conditions of Tables 3 and 4 from a minimum of 2.7 to 3.0 V. Updated typical and max Supply Current number in Table 3. Removed tantalum requirement in Figure 5. Consolidated Sections 8 and 9. Added Section "12.
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