1
1
2
2
3
3
4
4
D D
C C
B B
A A
C1
106
C2
104
C4
104
VCC+3V3
C3
106
VCC+5V
Y1
12M
C5
22
C6
22
R2
472
LED1
PWR
GND
1
TXD
2
RXD
3
V3
4
UD+
5
UD-
6
XI
7
XO
8
CTS#
9
DSR#
10
RI#
11
DCD#
12
DTR#
13
RTS#
14
R232
15
VCC
16
U1
CH340G
CH340G_VCC
CH340G_3V3GND
VCC+5V
VCC+5V
R3
472
LED2
TXD
CH340G_VCC
R4
472
LED3
RXD
CH340G_VCC
CH340G_TXD
CH340G_RXD
CH340G_RXD
CH340G_TXD
GND
VCC+5V
VCC+3V3
1
2
3
4
J2
USB
CH340G_V CC
CH340G_T XD
CH340G _RXD
GND
CH340G_3V3
1
2
3
4
5
6
J1
CON6
R1
221
VD1
3V3
CH340G_VCC:
模块供电点
VCC+5V
：从
USB
取出来的
5V
电源
VCC+3V3
：模块稳压出来的
3V3
电源（
3.0V
－
3.6V
）
（短路
VCC+5V
到
CH340G_VCC
：
CH340G
供电为
5V
，
TTL
电平为
5V
）
（短路
VCC+3V3
到
CH340G_VCC
：
CH340G
供电为
3V3
，
TTL
电平为
3V3
）
CH340G_TX D
：串行数据输出
CH340G_RXD
：串行数据输入
GND
：模块接地（与目标系统地相连）
