CH343 USB UART Board User Guide

Introduction

USB To UART Module, Micro / Mini / Type-A / Type-C Connectors, High Baud Rate Transmission

Features

• Adopts new version CH343G chip. Compared with CH340G, it supports a higher data rate (up to 6Mbps) and more serial port IO levels (5V / 3.3V / 2.5V / 1.8V).
• Supports Mac, Linux, Android, Windows 7/8/8.1/10/11.
• Onboard resettable Fuse and Transient Voltage Suppressor, anti-overcurrent and anti-overvoltage, anti-surge, anti-static, improve shock resistance, stable and safe communication performance.
• Onboard IO protection circuits, anti-surge, anti-static, stable, and safe communication performance.
• Onboard 3.3V and 5V TTL level switch pins for selecting TTL communication level.
• Support 3.3V/5V output (the module is powered by USB, and the onboard jumper should be shorted to 3.3V or 5V accordingly).
• Adopts double-sided black immersion gold process, which is durable and has a good look.

Specifications

• Host interface: USB
• Device interface: UART
• Communication range: 50bps ~ 6Mbps
• USB Device Interface:
  • connector: mini-USB, micro-USB, USB Type-A, USB Type-C;
  • protection: resettable Fuse, ESD protection
• UART interface:
  • connector: 6pin right-angle pinheader;
  • protection: IO protection diode

①: The onboard 5V/3.3V can be selected by the jumper cap, or the jumper cap can be unplugged, and the external voltage input can also be used (2.5V/1.8V, except industrial grade).

Pinouts

About CH343

CH343 is a USB bus adapter chip, realizes USB to high-speed asynchronous serial port, and supports up to 115200bps communication Automatic identification and dynamic self-adaptation of baud rate, providing common MODEM contact signals for expanding asynchronous serial ports of computers, or feature USB bus for the common serial device or MCU.

How to use

Windows

For most of the PC, the driver for CH343 is CDC by default, if you need to use VCP driver, please download the driver and install munually.
The CH343 USB UART board use software flow control by default, if you want to use hardware flow control, connect CFG to EN for CDC mode, set in SSCOM software for VCP mode.

Linxu/Raspberry Pi

To work with Raspberry Pi, it is driver-free, just connect and check with the following command:

ls /dev/tty*

The port should be named as ttyACM0, user can use the minicom tool to test.

sudo apt-get install minicom -y
minicom -D /dev/ttyACM0

MacOS

To use with MacOS, please download the driver and follow the guide

• CH343 driver for MacOS
• MacOS guide

Android

To use with Android device, please donwnload the APP and test.

• UART APP in Android

3. Set the parameters to use.

Resources

• CH343 Datasheet
• SSCOM software
• CH343 VCP driver for Windows
• CH343 driver for MacOS
• MacOS guide
• UART APP in Android

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