Chengdu Ebyte Electronic Technology Co., Ltd
E21-400G37 User Manual
Copyright ©2012–2019, hengdu Ebyte Electronic Technology Co., Ltd
6
Chapter 3 Mechanical Dimensions and Pin Definitions
PIN
Name
Direction
Usage
1
GND
Ground wire, connected to reference ground
2
+7.5V
PA drive power VCC1
3
+7.5V
PA drive power VCC1
4
GND
Ground wire, connected to reference ground
5
+5V
Control power supply VCC2
6
GND
Ground wire, connected to reference ground
7
TXEN
Input
Enable the transmission mode, effective at high level
(support 3.3V/5V level)
8
RXEN
Input
Receive mode enable, active at high level (support
3.3V/5V level)
9
GND
Ground wire, connected to reference ground
10
PIN
Input/Output
Transmission mode: RF signal input/reception mode: RF
signal output
11
POUT
Output/Input
Transmission mode: RF signal output/reception mode: RF
signal input
12
GND
Ground wire, connected to reference ground
13
GND
Ground wire, connected to reference ground
14
GND
Ground wire, connected to reference ground
15
GND
Ground wire, connected to reference ground
16
GND
Ground wire, connected to reference ground
17
GND
Bottom heat dissipation pad, connecting module GND
