Part Number : CH340

Function : USB to serial chip

Package : SSOP-20 Type

Maker :WKH

CH340 datasheet

Description :

CH340 is a USBbus convert chip and it can realize USB convert to serial interface, USB convert to IrDA infrared or USB convert to printer interface.

In serial interface mode, CH340 supplies common MODEM liaison signal, used to enlarge asynchronous serial interface of computer or upgrade the common serial device to USBbus directly.

More detail about USB convert to printer interface please referring to the second manual CH340DS2. In infrared mode, add infrared transceiver to CH340 can compose USB infrared adapter, realize SIR nfrared communication.



1. Full speed USB device interface, conforms to USB Specification Version 2.0, only needs crystal and capacitance external.

2. Emulate standard serial interface, used to upgrade the former peripheral device, or add excess serial interface through USB. 

Datasheet PDF Download :
CH340 pdf

Others datasheet of same file : CH340R, CH340T

2021/11/26 15:45 2021/11/26 15:45