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WSAL21440 – CH343 USB UART Board/en

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Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

The Waveshare CH343 USB UART module converts USB to a serial (TTL) port. It uses the newer CH343G chip, supports data rates from 50 bps up to 6 Mbps and offers selectable TTL levels (5 V / 3.3 V; optionally external 2.5 V / 1.8 V). The module has a 6-pin right-angle pin header on the UART side and connects via mini-, micro-, Type-A or Type-C USB depending on the product variant.

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Technical overview

  • Chip: new version CH343G vs. CH340G; higher data rate up to 6 Mbps and more selectable serial-port IO levels (5 V / 3.3 V / 2.5 V / 1.8 V).
  • Interfaces: host side USB (mini/micro/Type-A/Type-C depending on variant), device side UART via 6-pin right-angle pin header.
  • Powering: module is powered over USB; onboard jumper selects 5 V or 3.3 V output for external devices.
  • Protection circuits: resettable fuse, transient voltage suppressor, IO protection diode against overvoltage, surge and static discharge.
  • Operating systems: Windows 7/8/8.1/10/11, macOS, Linux/Raspberry Pi, Android – driver requirements differ per OS.
  • UART pin mapping: TXD→MCU.RXD, RXD→MCU.TXD, RTS#→MCU.CTS, CTS#→MCU.RTS plus MODEM contacts RI#, DCD#, DTR#, DSR# (active-low signals).
  • Default is software flow control; for hardware flow control connect CFG to EN (CDC mode) or configure in SSCOM (VCP mode).
  • Manufacturing process: double-sided black immersion gold plating for durability and appearance.

Commands and examples – verify before use:  

ls /dev/tty*
sudo apt-get install minicom -y
minicom -D /dev/ttyACM0

Notes and version constraints

  • Windows driver installation may trigger a digital signature warning; the source mentions a Microsoft bug-fix tool whose availability is not independently confirmed.
  • Using 2.5 V or 1.8 V requires external voltage input instead of the jumper; exact connection method is only generally described in the source.
  • The source contains placeholders such as {{{name2}}} through {{{name6}}}, {{{userDefinedInfo}}} and {{{5}}} – these are incomplete and need manual completion.
  • The phrase 'High Baud Rate Transmission' is marketing language; the actual 6 Mbps rate is specification-based.
  • Knock-off warning: the source warns about inferior copies in the market; authenticity verification should be done for non-official stores.

Source and revision record

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