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Chengdu Ebyte Electronic Technology Co., Ltd.
No.
Name
1
GND
2
GND
3
GND
4
GND
5
M0
6
M1
7
RXD
8
TXD
9
AUX
10
VCC
11
GND
12
NRST
13
GND
14
NC
15
NC
16
NC
17
NC
18
NC
19
GND
20
GND
21
ANT
22
GND
Copyright ©2012–2018，Chengdu Ebyte Electronic Technology Co.,Ltd.
Direction
Ground
Ground
Ground
Ground
Input
Work with M1 to decide 4 working modes of module (not suspended, if not
（weak pull-up）
used, could be grounded).
Input
Work with M0 to decide 4 working modes of module (not suspended, if not
（weak pull-up）
used, could be grounded).
TTL UART inputs, connects to external (MCU, PC) TXD output pin. Can be
Input
configured as open-drain or pull-up input.
TTL UART outputs, connects to external RXD (MCU, PC) input pin. Can be
Output
configured as open-drain or push-pull output
To indicate module ' s working status & wakes up the external MCU.
Output
During the procedure of self-check initialization, the pin outputs low level.
Can be configured as push-pull output (suspending is allowed).
Power supply ：2.3~ 5.2V DC
Ground
Input
Module reset pin, low reset
Ground
Ground
Ground
Antenna
Ground
E22-400T22S1C User manual
Function
8
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