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CH340 Schematic ( PDF Datasheet ) - ETC

Teilenummer CH340
Beschreibung USB to serial chip
Hersteller ETC
Logo ETC Logo 



Gesamt 11 Seiten
		
CH340 Datasheet, Funktion
The DataSheet of CH340 (the first)
1
USB to serial chip CH340
English DataSheet
Version: 1D
http://wch.cn
1. Introduction
CH340 is a USB bus 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 USB bus 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
infrared communication.
Computer
or other
USB host
USB
CH340
convert
chip
UART/RS232/IrDA infrared SIR
parallel printer to USB printer
2. Features
Full speed USB device interface, conforms to USB Specification Version 2.0, only needs crystal and
capacitance external.
Emulate standard serial interface, used to upgrade the former peripheral device, or add excess serial
interface through USB.
Totally compatible with serial application program in computer endpoint Windows operation system.
Hardware full duplex serial interface, set transceiver buffer, supports communication baud rate varies
from 50bps to 2Mbps.
Supports common MODEM liaison signal RTS, DTR, DCD, RI, DSR and CTS.
Through adding level converter equipment to supply RS232, RS485, RS422 and other interface.
Supports IrDA criterion SIR infrared communication, supports baud rate varies from 2400bps to
115200bps.
For it is through USB converts to serial interface, only compatible with application layer not totally.
Software compatible with CH341, using drive of CH341 directly.
Support 5V and 3.3V source voltage.
Supply SSOP-20 package without lead, compatible with RoHS.






CH340 Datasheet, Funktion
The DataSheet of CH340 (the first)
6
7.3. USB convert RS232 serial interface, handing edition (the following image)
The following image also is USB convert three RS232 serial interface, the function of this circuit is the
same with 7.2. except the range of output RS232 is low. R232 in CH340 is high-level starts assistant RS232
function, only add diodeaudionresistor and capacitance can replace the special level convert circuit U5 in
7.2.. So the hardware cost is lower.
7.4. USB infrared adapter (the following image)
The following USB infrared adapter image is composed with USB convert IrDA infrared chip CH340R
and infrared transceiver U14 (ZHX1810/HSDL3000 etc). The resistor R13 is used to weaken influence of
large current when infrared transferring. R13 can be ignored when the request is low. The limited current
resistor R14 can be adjusted according recommended value supplied by the infrared transceiver U14s
manufacture.
Consulting the following image, if selecting CH340H or CH340T chip, only to insert a inverter in TXD
signal wire can realize the similar infrared function of the upper image.(the converter circuit in the following
is composed of audion T12 and two resistors R10 and R11).

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