High-Speed USB Converter Chip CH347 Datasheet

CH347DS1 is the datasheet (technical manual) for the WCH CH347 high-speed USB converter chip (Nanjing Qinheng Microelectronics).

High-Speed USB Converter Chip CH347 Datasheet

(Chinese: 高速USB转接芯片 CH347 手册 )

Version: 1.4
Manufacturer: Nanjing Qinheng Microelectronics Co., Ltd. (WCH)

Key details

• Chip: CH347 — 480 Mbps high-speed USB device that provides:
  • Dual high-speed UART (async serial, with RS485 direction control, hardware flow control, MODEM signals)
  • I²C (2-wire)
  • SPI (4-wire)
  • JTAG (and SWD support in some modes)
• Typical uses: USB-to-UART, USB-to-SPI, USB-to-I²C, USB-to-JTAG, CPU/FPGA debugger, programmer, etc.
• Drivers for Windows / Linux / Android / macOS.
• Packages: TSSOP-20 (CH347T) and QFN28 (CH347F).
• Version commonly referenced: 1.4 (updated ~2025).

Download / official sources

• Official download page (WCH):
  https://www.wch-ic.com/downloads/CH347DS1_PDF.html
  (or the Chinese site equivalent on wch.cn)
• Direct PDF mirrors that work:
  • Internet Archive (Chinese version of the datasheet, ~1.8 MB, 15 pages): available in the WCH chip docs collection.
  • Other public mirrors (bitsavers, etc.) also host older copies.

I have downloaded a copy of the datasheet (CH347DS1.PDF) into the working directory.