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USB to Dual Serial Ports Chip CH342

Introduction

CH342 is a USB bus converter chip, which converts USB to dual serial ports.

Each UART supports high-speed full-duplex and odd/even parity, provides standard MODEM signals, used to expand serial ports for computer or upgrade directly from normal serial device or MCU to USB bus.

Features

  • Full-speed USB device interface, USB 2.0 compatible.
  • Emulate standard UART interface, used to upgrade the original serial peripheral or expand additional UART via USB.
  • Original serial applications are totally compatible without any modification in Windows operating systems.
  • Supports free installation OS which built-in CDC driver or multi-functional high-speed VCP vendor driver.
  • Hardware full duplex UART interface, integrated independent transmit-receive buffer, supports communication baud rate varies from 50bps to 3Mbps.
  • UART supports 5, 6, 7 or 8 data bits, supports odd, even, space, mark and none parity.
  • Supports common MODEM interface signals RTS, DTR, DCD, DSR and CTS.
  • Supports CTS and RTS hardware automatic flow control.
  • Supports half-duplex, provides sending status TNOW, used for controlling RS485 to transmit-receive switch.
  • Supports RS232 interface, through external voltage conversion chip.
  • Supports 5V and 3.3V power supply voltages.
  • UART interface I/O powered independently, supports 5V, 3.3V, 2.5V, 1.8V power supply voltages.
  • Integrated power-on reset, integrated clock, no external crystal required.
  • Built-in EEPROM used to configure the chip of VID, PID, maximum current value, vendor and product information string, etc.
  • Integrated Unique ID (USB Serial Number).
  • RoHS compliant QFN24, ESSOP10 lead-free package.

Packages

Note: The backplane of CH342F/CH342K is 0# pin GND, which is an optional but recommended connection; other GND are necessary connections.

The USB transceiver of CH342 is designed according to the built-in design of USB2.0, and it is recommended that no external resistor is in series with UD+ and UD- pins.

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relation files

file name file content
CH343SER.EXE One-Key installation driver for Windows for CH342/CH343/CH344/CH346/CH347/CH9101/CH9102/CH9103/CH9104/CH9111/CH9114/CH9143, USB to high-speed serial ports VCP vendor driver, supports Windows 11/10/8.1/8/7/VISTA/XP/2000，Server 2025/2022/2019/2016/2012/2008/2003 -32/64bit, Microsoft WHQL/HCK Certified, supports USB to 3-line and 9-line serial ports, VCP driver supports more features, supports full serial port functions, hardware flow control, GPIO, USB parameter configuration, etc. Supports continuous and stable transmission at high baud rate. Used to distribute to user with the product.
CH343SER.ZIP VCP vendor driver and dll lib for Windows, supports CH342/CH343/CH344/CH346/CH347/CH9101/CH9102/CH9103/CH9104/CH9111/CH9114/CH9143, USB to high-speed serial port VCP vendor driver, supports Windows 11/10/8.1/8/7/VISTA/XP/2000，Server 2025/2022/2019/2016/2012/2008/2003 -32/64bit, Microsoft WHQL/HCK Certified, supports USB to 3-line and 9-line serial ports, VCP driver supports more features, supports full serial port functions, hardware flow control, GPIO, USB parameter configuration, etc. Supports continuous and stable transmission at high baud rate.
CH343CDC.EXE For CH342/CH343/CH344/CH347/CH910X/CH9143/CH9340, USB to CDC serial port driver, supports Windows 11/10/8.1/8/7/VISTA/XP/2000，SERVER 2022/2019/2016/2012/2008/2003 -32/64bit, Microsoft WHQL Certified, supports USB to 3-line and 9-line serial port, supports high-speed baud rate. Used to distribute to user with the product.
CH343CDC.ZIP For CH342/CH343/CH344/CH347/CH910X/CH9143/CH9340, USB to CDC serial port driver, supports Windows 11/10/8.1/8/7/VISTA/XP/2000，SERVER 2022/2019/2016/2012/2008/2003 -32/64bit, Microsoft WHQL Certified, supports USB to 3-line and 9-line serial port, supports high-speed baud rate.