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CP2103-GMR

USB-to-UART bridge, USB 2.0 FS, 300bps-2Mbps UART, 4 GPIO, internal EEPROM, QFN-28 (NRND)

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Manufacturer Part：

CP2103-GMR

Package：

QFN-28 (5.00 x 5.00 x 0.90 mm)

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Description

Product Overview

The CP2103-GMR from Silicon Labs is a USB-to-UART bridge controller in a QFN-28 (5x5mm) package. It provides a complete USB 2.0 full-speed to UART bridge with 4 configurable GPIO pins, internal EEPROM for USB configuration, and supports UART data rates from 300bps to 2Mbps. The device is NRND (Not Recommended for New Designs).

Key Specifications

USB Standard USB 2.0 Full-Speed
UART Data Rate 300bps ~ 2Mbps
Supply Voltage 3.0V ~ 3.6V (internal regulator for USB 5V)
GPIO 4 (Configurable)
Internal EEPROM Yes (USB configuration parameters)
ESD Protection Yes
Package QFN-28 (5.00 x 5.00mm)
Operating Temperature -40°C ~ +85°C
Product Status NRND (Not Recommended for New Designs)

Features

  • Complete USB-to-UART bridge with no external components required
  • Integrated USB transceiver with no external resistors needed
  • On-chip voltage regulator accepts USB 5V supply
  • 4 configurable GPIO pins for modem or status signals
  • Internal EEPROM stores USB VID/PID and configuration data
  • Supports hardware handshake signals (RTS/CTS, DTR/DSR)
  • Free virtual COM port drivers for Windows, Linux, macOS
  • Lead-free QFN-28 package

Applications

  • USB-to-RS232/RS485 adapter cables
  • Embedded system debug and programming interfaces
  • Consumer device PC connectivity
  • Industrial equipment USB communication ports
  • IoT device programming and configuration

The CP2103-GMR from Silicon Labs is a highly integrated USB-to-UART bridge controller that provides a complete solution for adding USB connectivity to legacy UART-based devices. It integrates a USB 2.0 full-speed transceiver, USB controller, and UART interface in a single 28-pin QFN package with no external USB components required. The internal voltage regulator allows the device to be powered directly from the USB 5V bus. Four configurable GPIO pins can be used for modem control signals or general-purpose I/O. The internal EEPROM stores USB vendor ID (VID), product ID (PID), and other USB configuration parameters, allowing customization without external programming. Free virtual COM port (VCP) drivers are available for Windows, Linux, and macOS, enabling the device to appear as a standard serial port to application software. Note: This device is NRND; the CP2102N is the recommended replacement for new designs.

The CP2103 operates as a protocol bridge between USB and UART domains. On the USB side, the integrated USB transceiver connects directly to the USB bus via the D+ and D- pins. The USB controller handles all USB protocol-level operations including device enumeration, endpoint management, and data packet formatting. On the UART side, TXD and RXD pins provide asynchronous serial data transfer, while optional RTS, CTS, DTR, and DSR pins support hardware flow control. Data received from USB is buffered and converted to UART format with the configured baud rate, data bits, stop bits, and parity. Conversely, UART data is buffered and formatted into USB bulk transfers for upstream transmission. The internal EEPROM is programmed via a Silicon Labs host utility to store custom USB descriptors. The 4 GPIO pins can be individually configured as inputs or outputs and controlled through the VCP driver API. An internal oscillator eliminates the need for an external crystal.

Pin Name Function
1 VREGIN USB bus power input (4.0V-5.25V)
2 D+ USB data positive
3 D- USB data negative
4 GND Ground
5 VBUS USB VBUS sense input
6 TXD UART transmit data output
7 RXD UART receive data input
8 CTS Clear To Send input
9 RTS Request To Send output
10 DTR Data Terminal Ready output
11 DSR Data Set Ready input
12 DCD Data Carrier Detect input
13 RI Ring Indicator input
14-17 GPIO0-GPIO3 Configurable general-purpose I/O
18 VDD 3.0V-3.6V supply output (internal regulator)
  • USB Debug Adapter: Provides virtual COM port for MCU UART debug output; DTR/RTS signals enable automatic reset for bootloader programming
  • Industrial Equipment USB Port: Converts legacy RS-232 equipment to USB connectivity; internal EEPROM allows custom VID/PID branding
  • IoT Device Configuration: USB interface for field firmware updates and sensor configuration via UART bootloader
  • Consumer Device PC Link: 4 GPIO pins control device power and status LEDs; free VCP drivers ensure cross-platform compatibility
Model Manufacturer Key Difference
CP2102N-A02-GQFN24 Silicon Labs Recommended replacement, QFN-24, lower cost
CP2104-F03-GM Silicon Labs Smaller QFN-24, 2Mbps, configurable
CH340G WCH Low-cost alternative, SOIC-16
FT232RQ FTDI QFN-32, 3Mbps, extensive driver support
MCP2221A-I/P Microchip USB-to-UART + I2C, DIP-14
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Contact Information

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Tel / WhatsApp: +86 13760382860

Service & Packaging

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Contact Information

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Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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