2024年4月15日发(作者：庹振博)
CH340 DataSheet(1st) 1
USB to UART Bridge Controller CH340
DataSheet
Version: 2F
1. Introduction
CH340 is a USB bus converter chip, which converts USB to serial UART interface or to printer interface.
In serial UART mode, CH340 provides common MODEM signal, to expand UART interface of computer
or upgrade common serial devices to USB bus directly. For more information about converting USB to printer
interface, please refer to the manual CH340DS2.
2. Features
● Full speed USB device interface, USB 2.0 compatible.
● Emulate standard UART interface, used to upgrade the original serial peripherals or expand additional
serial UART via USB.
● Original serial applications are totally compatible without any modification.
● Hardware full duplex serial UART interface, integrated transmit-receive buffer, supports communication
baud rate varies from 50bps to 2Mbps.
● Supports common MODEM interface signals RTS, DTR, DCD, RI, DSR and CTS.
● Provides further RS232, RS485, RS422 interface, etc. through external voltage conversion chip.
● CH340R supports IrDA criterion SIR infrared communication, supports baud rate varies from 2400bps to
115200bps.
● Software compatible with CH341, use driver of CH341 directly.
● Supports 5V and 3.3V power supply even 3V.
● CH340C/N/K/E and CH340B have integrated 12MHz clock, no external crystal required, CH340B also
integrates EEPROM used to configure the serial number, etc.
● RoHS compliant SOP-16, SOP-8, SSOP-20 and ESSOP-10, MSOP-10 lead-free package.
CH340 DataSheet(1st) 2
3. Packages
Package
SOP-16
SOP-16
SOP-8
ESSOP-10
SOP-16
MSOP-10
SSOP-20
SSOP-20
Width Of Plastic Pitch Of Pin Instruction Of Package
Small outline 16-pin patch
Small outline 16-pin patch
Small outline 8-pin patch
Shrink Small outline 10-pin patch with
backplane
Small outline 16-pin patch
Miniature Small outline 10-pin patch
Shrink Small outline 20-pin patch
Shrink Small outline 20-pin patch
Ordering
Information
CH340G
CH340C
CH340N
CH340K
CH340B
CH340E
CH340T
CH340R
3.9mm 150mil 1.27mm 50mil
3.9mm 150mil 1.27mm 50mil
3.9mm 150mil 1.27mm 50mil
3.9mm 150mil 1.00mm 39mil
3.9mm 150mil 1.27mm 50mil
3.0mm 118mil 0.50mm 19.7mil
5.30mm 209mil 0.65mm 25mil
5.30mm 209mil 0.65mm 25mil
Model differences:
CH340C, CH340N, CH340K, CH340E and CH340B have integrated clock, no external crystal required.
CH340B has also integrated EEPROM used to configure the serial number, etc. Some functions can be
customized.
The CH340K has three diodes built in to reduce current flow backwards between the I/O pins of the MCU.
The backplane of the CH340K is 0# pin GND, which is an optional connection; the 3# pin GND is the
necessary connection.
CH340R provides reverse polarity TXD and MODEM interface signals. (Discontinued)
4. Pin Out
2024年4月15日发(作者：庹振博)
CH340 DataSheet(1st) 1
USB to UART Bridge Controller CH340
DataSheet
Version: 2F
1. Introduction
CH340 is a USB bus converter chip, which converts USB to serial UART interface or to printer interface.
In serial UART mode, CH340 provides common MODEM signal, to expand UART interface of computer
or upgrade common serial devices to USB bus directly. For more information about converting USB to printer
interface, please refer to the manual CH340DS2.
2. Features
● Full speed USB device interface, USB 2.0 compatible.
● Emulate standard UART interface, used to upgrade the original serial peripherals or expand additional
serial UART via USB.
● Original serial applications are totally compatible without any modification.
● Hardware full duplex serial UART interface, integrated transmit-receive buffer, supports communication
baud rate varies from 50bps to 2Mbps.
● Supports common MODEM interface signals RTS, DTR, DCD, RI, DSR and CTS.
● Provides further RS232, RS485, RS422 interface, etc. through external voltage conversion chip.
● CH340R supports IrDA criterion SIR infrared communication, supports baud rate varies from 2400bps to
115200bps.
● Software compatible with CH341, use driver of CH341 directly.
● Supports 5V and 3.3V power supply even 3V.
● CH340C/N/K/E and CH340B have integrated 12MHz clock, no external crystal required, CH340B also
integrates EEPROM used to configure the serial number, etc.
● RoHS compliant SOP-16, SOP-8, SSOP-20 and ESSOP-10, MSOP-10 lead-free package.
CH340 DataSheet(1st) 2
3. Packages
Package
SOP-16
SOP-16
SOP-8
ESSOP-10
SOP-16
MSOP-10
SSOP-20
SSOP-20
Width Of Plastic Pitch Of Pin Instruction Of Package
Small outline 16-pin patch
Small outline 16-pin patch
Small outline 8-pin patch
Shrink Small outline 10-pin patch with
backplane
Small outline 16-pin patch
Miniature Small outline 10-pin patch
Shrink Small outline 20-pin patch
Shrink Small outline 20-pin patch
Ordering
Information
CH340G
CH340C
CH340N
CH340K
CH340B
CH340E
CH340T
CH340R
3.9mm 150mil 1.27mm 50mil
3.9mm 150mil 1.27mm 50mil
3.9mm 150mil 1.27mm 50mil
3.9mm 150mil 1.00mm 39mil
3.9mm 150mil 1.27mm 50mil
3.0mm 118mil 0.50mm 19.7mil
5.30mm 209mil 0.65mm 25mil
5.30mm 209mil 0.65mm 25mil
Model differences:
CH340C, CH340N, CH340K, CH340E and CH340B have integrated clock, no external crystal required.
CH340B has also integrated EEPROM used to configure the serial number, etc. Some functions can be
customized.
The CH340K has three diodes built in to reduce current flow backwards between the I/O pins of the MCU.
The backplane of the CH340K is 0# pin GND, which is an optional connection; the 3# pin GND is the
necessary connection.
CH340R provides reverse polarity TXD and MODEM interface signals. (Discontinued)
4. Pin Out