Data Sheet

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The Data Sheet of CH340 (the first) 1

USB to serial chip CH340

English Data

Sheet Version: 2C

http://wch.cn

1 Introduction

CH34

0 is a USB bus conversion chip, it can realize USB to UART interface or USB to printer interface.

In serial UART mode, CH340 provides common MODEM liaison signal, used to expand UART interface of

computer or upgrade the common serial device to USB bus directly. For more information on USB conversion to

printer interface please refer to the manual CH340DS2.

2 Features

● Full speed USB device interface, compatible with USB V2.0.

● Em

ulate standard UART interface, used to upgrade the serial peripherals, or expand UART interface via

USB bus.

● O

riginal serial applications are totally compatible, without any modification in Windows operation system.

● H

ardware full duplex serial UART interface, built-in transmit-receive buffer, supports communication baud

rate varies from 50bps to 2Mbps.

● Supports

common MODEM liaison signal RTS, DTR, DCD, RI, DSR and

CTS.

● Through ext

ernal level conversion chip provide further RS232, RS485, RS422 interface, etc.

● CH340R

supports IrDA criterion SIR infrared communication, supports baud rate varies from 2400bps to

115200bps.

● Software compatible with CH341, use driver of CH341 directly.

● Suppo

rt 5V and 3.3V power supply even 3V.

● CH

340C, CH340E and CH340B have built-in crystal, no external crystal, CH340B also integrates

EEPROM used to configure the serial number, etc.

● SOP-

16 and SSOP-20 and MSOP-10 lead-free RoHS compliant package.

Summary of content (8 pages)

PAGE 1
The Data Sheet of CH340 (the first) 1 USB to serial chip CH340 English Data Sheet Version: 2C http://wch.cn 1 Introduction CH340 is a USB bus conversion chip, it can realize USB to UART interface or USB to printer interface. In serial UART mode, CH340 provides common MODEM liaison signal, used to expand UART interface of computer or upgrade the common serial device to USB bus directly. For more information on USB conversion to printer interface please refer to the manual CH340DS2.
PAGE 2
The Data Sheet of CH340 (the first) 2 3 Package Package shape Width of plastic Pitch of Pin Instruction of package Ordering type SOP-16 3.9mm 150mil 1.27mm 50mil Small outline package of 16-pin CH340G SOP-16 3.9mm 150mil 1.27mm 50mil Small outline package of 16-pin CH340C SOP-16 3.9mm 150mil 1.27mm 50mil Small outline package of 16-pin CH340B MSOP-10 3.0mm 118mil 0.50mm 19.7mil Shrink small outline package of 10-pin CH340E SSOP-20 5.30mm 209mil 0.
PAGE 3
The Data Sheet of CH340 (the first) 3 pull-up resistor 10 8 NONE XO OUT CH340T/R/G: Output of crystal oscillator, connect to crystal and capacitor NC.
PAGE 4
The Data Sheet of CH340 (the first) 4 CH340B chip also provides EEPROM for configuring data area, product serial number and other information could be customized for each chip by specific software tools, configurable data area is shown in the table below. Byte Abbreviati on Address Description of chip configuration data area For CH340B: Internal configuration information valid reg, must be 58H. For CH340H/S: External configuration information valid reg, must be 53H.
PAGE 5
The Data Sheet of CH340 (the first) 5 Data transfer pins contain: TXD and RXD pin. RXD keeps high when UART reception is idle. For CH340G/C/T/R chip, If R232 pin is driven high, assistant RS232 function will be enabled, an internal inverter will automatically insert to the RXD pin , and the pin becomes low by default. When UART transmission is idle, the TXD pin of CH340G/C/B/T keeps high, while CH340R keeps low. MODEM liaison signal pins contain: CTS#, DSR#, RI#, DCD# and RTS#.
PAGE 6
The Data Sheet of CH340 (the first) 6 6.2. Electrical Parameter (test conditions: TA=25℃, VCC=5V, exclude pin connected to USB bus) (All the current parameters should multiply the coefficient of 40% when the power is 3.3V) Name Parameter Description VCC Supply Voltage ISLP Typical Max. 4.0 5 5.3 CH340G/T/R 2.8 3.3 3.6 CH340C/E/B 3.0 3.3 3.6 V3 doesn’t connect to VCC V3 connect to VCC ICC Min.
PAGE 7
The Data Sheet of CH340 (the first) 7 7.1.2 USB to RS232 Converter Configuration using CH340B The image above use CH340T/CH340B (or CH340C ) to realize USB to RS232 converter. CH340 provides common UART and MODEM signal, converts TTL to RS232 through level conversion chip U8. Port P11 is DB9 connector, the pin and its function are the same as common PC DB9 connector, the chips similar with U8 have MAX213/ADM213/SP213/MAX211 etc.
PAGE 8
The Data Sheet of CH340 (the first) 8 7.3 USB to RS232 Converter Configuration (Simplified version using R232) The image above is USB to RS232 converter design too, the function of this circuit is the same with 7.2 section except the range of output RS232 is narrower. When R232 pin is driven high, the assistant RS232 function will be enabled, just need to add some diodes, transistors, resistors and capacitors, the special level conversion chip U5 in section 7.