CH340 Datasheet (I)
7
57600, 76800, 115200, 128000, 153600, 230400, 460800, 921600, 1500000, 2000000, etc.
For one-directional 1Mbps and above, or bi-directional 500Kbps and above, recommended to use CH343,
enable automatic hardware flow control.
The baud rate error of CH340 UART reception is about 2%, the baud rate error of CH340G/CH340T/CH340R
UART transmission is less than 0.3%, and the baud rate of CH340C/CH340N/CH340K/CH340E/CH340X/CH340B
is less than 1.2%.
In Windows OS of computer, CH340 driver can emulate standard UART. So the mostly original serial
applications are totally compatible, without any modification.
CH340 can be used to upgrade the serial interface peripherals, or expand extra UART for computers via
USB bus, through external level conversion chip provide further RS232, RS485, RS422 interface, etc.
Through extra infrared transceiver, CH340R can expand SIR infrared adapter for computer via USB bus,
realize infrared communication between computers and peripheral equipment that comply with IrDA
specifications.
6. Parameters
6.1. Absolute maximum ratings
(Operating in critical ratings or exceeding the absolute maximum ratings may cause chip to not work or
even be damaged.)
Symbol
Parameter Description
Min.
Max.
Unit
CH340G/CH340T/CH340R
-40
85
℃
CH340C/CH340N/CH340K/
CH340E/CH340B
-20
70
℃
TA
Operating ambient
temperature
CH340X/ CH340C/N whose batch
number begins with 4
-40
85
℃
TS
Storage temperature
-55
125
℃
VCC
Supply voltage(VCC connects to power, GND connects to
ground)
-0.5
6.0
V
VIO
Voltage on input or output pins
-0.5
VCC+0.5
V
6.2. Electrical characteristics (5V)
(Test conditions: TA=25 , VCC=5V, exclude pin
℃
s connected to USB bus.)
Symbol
Parameter Description
Min.
Typ.
Max.
Unit
VCC
Supply
voltage
V3 only connect to an external capacitor,
does not connect to VCC
4.0
5
5.3
V
CH340G/C/N/K/E/
X/T/R
7
20
mA
ICC
Operating total supply current
CH340B
6
15
mA
|
