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DreamCity Innovations

WCH CH340G Datasheet

WCH CH340 Series USB Interface Integrated Circuit

CH340G USB to UART Interface

Datasheet

WCH Version 1E

DreamCity Version 1.0

Disclaimer from DreamCity Innovations

This is a third-party translation of WCH’s CH340 Series chipset’s Chinese datasheet, with

information regarding CH340G chip extracted. The two other chips sharing the same

datasheet, CH340R and C340T, have official English version.

1. Overview

CH340 is a series of USB bus adapters, that provides serial, parallel or IrDA interfaces over

the USB bus (note: CH340G supports serial interface only). The CH340G integrate circuit

provides common MODEM signals to allow adding a UART to a computer, or converting

existing UART devices to USB interface.

2. Features

Full-speed USB interface, compatible with USB 2.0 interface.

Operates with a minimum amount of external components: a crystal and a minimum of four

capacitors.

•

Provides a virtual serial port for upgrading existing serial port devices or adding serial ports

to a PC.

Supports all existing applications using serial ports without the need of changing existing

code.

Hardware full-duplex serial interface with internal FIFO. Baud rate range from 50bps to

2Mbps.

•

Supports common flow control signals RTS, DTR, DCD, RI, DSR and CTS.

Supports RS232, RS422 and RS485 with external level shifting components.

Uses CH341 driver.

Supports 5V and 3.3V operation.

RoHS-compliant narrow body SO-16 package.

•

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WCH CH340G Datasheet

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