The Adafruit CP2105 Friend provides two independent UART serial ports from a single USB-C connection — no USB hub required. Built around the Silicon Labs CP2105 dual-port bridge, it enumerates as two separate COM ports when plugged in, giving you an Enhanced port and a Standard port with different capabilities.

Key Features

• Dual UART Ports – Two independent serial ports from one USB-C connection, no hub needed
• USB Type-C – Modern, reversible connector
• Enhanced Port (Left Side) – 300 bps to 2.0 Mbps, 5/6/7/8 data bits, 1/1.5/2 stop bits, all parity modes, 320-byte buffers, full modem control (CTS, RTS, DTR, DSR, RI)
• Standard Port (Right Side) – 2400 bps to 921.6 kbps, 8 data bits, 1 stop bit, even/odd/no parity, 288-byte buffers, full modem control

Also Available

• CP2102N Friend – Single UART, USB-C, up to 3 Mbps
• CP2104 Friend – Single UART, Micro USB, up to 2 Mbps

Driver Support

• Linux – No driver required (built into kernel)
• Windows – Automatic driver installation via Windows Update
• macOS – Driver available from Silicon Labs

Specifications

• Dimensions – 28.9 × 17.8 × 4.9mm
• Weight – 2.3g

Ideal For

• Projects requiring two independent serial connections from a single USB port
• Simultaneous serial debugging and data communication
• Replacing dual FTDI cable setups with a single board

Resources

• CP210x USB to UART Bridge VCP Drivers
• Serial Communications Guide for the CP210x

Package Contents

• 1× Adafruit CP2105 Friend breakout (assembled and tested)
• 1× Pin header strip