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CH340G Datasheet(PDF) 5 Page - List of Unclassifed Manufacturers

Part # CH340G
Description  USB to UART Interface
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Manufacturer  ETC2 [List of Unclassifed Manufacturers]
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CH340G Datasheet(HTML) 5 Page - List of Unclassifed Manufacturers

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DreamCity Innovations
WCH CH340G Datasheet
CH340 have built-in FIFO buffer, and supports simplex, half- and full-duplex asynchronous
communication. The UART interface supports 1 start bit, 5-8 data bits, 1 or 2 stop bits, and
odd, even, space or mark parity bits. CH340 supports common baud rates: 50, 75,
100, 110, 134.5, 150, 300, 600, 900, 1200, 1800, 2400, 3600, 4800, 9600, 14400, 19200,
28800, 33600, 38400, 56000, 57600, 76800, 115200, 128000, 153600, 230400, 460800,
921600, 1500000, 2000000 baud. Transmitter baud rate error is less than 0.3%, receiver baud
rate error tolerance is at most 2%.
The emulated COM port is fully functional. Compatible with most applications using the serial
port, without the need of changing existing code.
CH340 can be used to upgrade existing peripherals using serial ports into USB devices, or
adding serial ports to a PC. With external level shifting hardware, interfaces including RS232,
RS422 and RS485 can be provided.
By adding infrared adapters, CH340 can be used to implement USB to SIR adapter, allowing a
PC to communicate with IrDA peripheral.
5.1. Example: USB RS232 adapter
The schematic above implements a USB to RS232 adapter based on CH340G and external
level adapter MAX213. When implementing this regulator-less 5V board, place capacitor C2
close to the V3 pin.
MAX213ECWI
PN61729-S
GND
10µ
10n
22p
22p
12M
GND
100n
100n
GND
GND
IC1
R4OUT
22
C1-
14
R1OUT
8
R2OUT
5
T1IN
7
T2IN
6
T3IN
20
R5OUT
19
R3IN
27
T1OUT
2
T2OUT
3
T3OUT
1
R5IN
18
C1+
12
R3OUT
26
R2IN
4
R1IN
9
R4IN
23
V-
17
EN
24
SHDN
25
V+
13
T4IN
21
T4OUT
28
C2+
15
C2-
16
VCC
16
GND
1
R232
15
V3
4
XI
7
XO
8
D+
5
D-
6
TXD
2
RXD
3
RTS#
14
DTR#
13
DCD#
12
RI#
11
DSR#
10
CTS#
9
IC2
X1
1
2
3
4
X2
1
6
2
7
3
8
4
9
5
C1
C2
C3
C4
Q1
C7
C8
GND
VCC
11
10
D-
D-
D+
D+
RXD
RXD
DCD
DCD
RI
RI
DSR
DSR
CTS
CTS
TXD
TXD
DTR
DTR
RTS
RTS
H_TXD
H_DTR
H_DTR
H_RTS
H_RTS
H_RXD
H_CTS
H_CTS
H_DCD
H_DCD
H_RI
H_RI
H_DSR
H_DSR
H_RX
H_TX
DreamCity Innovations
Page of
5
6
WCH CH340G Datasheet


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