User Manual

Chengdu Ebyte Electronic Technology Co., Ltd. E22-230T22S User manual
Copyright ©2012–2018，Chengdu Ebyte Electronic Technology Co.,Ltd.
10
No.
Name
Direction
Function
1
GND
-
Module ground
2
VCC
-
Module power supply positive reference
，
Power supply
：
3.3
～
5.5V DC
3
AUX
Output
The user wakes up the external MCU and outputs low level during power on
self-test initialization; (can be suspended)
4
TXD
Output
TTL UART outputs, connects to external (MCU, PC) RXD input pin.
5
RXD
Input
TTL UART inputs, connects to external (MCU, PC) RXD output pin.
6
M1
Input（weak pull-up）
Work with M1 to decide 4 working modes of module (not suspended, if not
used, could be grounded).
7
M0
Input（weak pull-up）
Work with M0 to decide 4 working modes of module (not suspended, if not
used, could be grounded).
11
ANT
Output
Antenna(high frequency signal output
，
50 ohm
）
12
GND
-
Ground
13
GND
-
Ground
14
GND
-
Ground
18
NC
-
Empty
19
NC
-
Empty
20
NC
-
Empty
21
+3.3V
-
Power pin when program is loading
（
suspend, no need to connect
，
cannot be
used as power supply
）
22
NC
-
Empty
23
GND
-
Module Ground
24
NC
-
Empty