CP2102 USB to TTL Serial Module with DTR Pin for Arduino Programming
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Prices updated: 13 Oct 2026
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About this product
A USB to TTL serial adapter board built around the Silicon Labs CP2102 chip. Its DTR pin allows direct program upload to boards such as the Arduino Pro Mini. It can also be used with 51-series and STM32 microcontrollers and for debugging Bluetooth, GSM and GPS modules.
Specifications
- Chip
- CP2102 (Silicon Labs)
- Interface
- USB to TTL UART
- Baud rate
- 300 to 230400 bps (as listed)
- Onboard fuse
- 500 mA
- DTR pin
- Yes
- Indicators
- Power, TX, RX
- Supported operating systems
- Windows, macOS, Linux
Frequently asked questions
How do I wire it to an Arduino Pro Mini?
Connect the module's TXD to the board's RX, RXD to TX, GND to GND, and DTR to DTR, using the pin labels on the module. Match the module's logic level to your board (3.3 V or 5 V) before connecting.
Does it need drivers?
The listing states support for Windows, Mac OS X and Linux. On some systems you may need the Silicon Labs VCP driver.
