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USB to Quad Serial Ports Chip CH344

Introduction

CH344 is a USB bus converter chip, which converts USB to quad serial ports UART0/1/2/3, and used to expand serial ports for computer or upgrade directly from normal serial device or MCU to USB bus.

Features

  • CH344Q integrates 480Mbps high-speed USB device interface, and CH344L integrates 12Mbps full-speed USB device interface.
  • Built-in firmware, 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.
  • CH344Q supports communication baud rate varies from 1200bps to 6Mbps, CH344L supports communication baud rate varies from 1200bps to 230400bps.
  • UART supports 8 data bits, and supports odd, even and none parity.
  • Integrated 1024-byte RX FIFO and 512-byte TX FIFO for each UART.
  • Supports common MODEM signals.
  • Supports CTS and RTS hardware automatic flow control.
  • Supports half-duplex, provides sending status TNOW, used for controlling RS485 to transmit-receive switch.
  • Supports up to 16-channel GPIO input and output function.
  • Supports RS232/RS485/RS422 interface, through external voltage conversion chip.
  • Built-in EEPROM used to configure the chip of VID, PID, maximum current value, vendor and product information string, etc.
  • Supports only 3.3V power supply.
  • RoHS compliant LQFP48 lead-free package.

Package

Note: The USB transceiver of CH344 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
CH344EVT.ZIP CH344 evaluation board description and design schematic, used for USB to quad serial ports.
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.
CH347DS1.PDF CH347 datasheet, 480Mbps high-speed USB to UART, I2C, SPI and JTAG, supports drivers on Windows/ Linux/ Android /macOS, used to high-speed USB to UART, USB to SPI, USB to IIC, USB to JTAG， CPU debugger，FPGA downloader，programming device etc.
CH340DS1.PDF CH340 datasheet, USB bus converter chip which converts USB to serial port, printer port, IrDA SIR etc. Integrated clock, supports various operating systems, chip information can be customized, this datasheet is about USB to serial port and USB to Infrared Adapter SIR.