Chengdu Ebyte Electronic Technology Co.,Ltd.
E49-900M20S user manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
5
Chapter 3 Size and pin definition
figure 3-1 Size and pin definition
Chart 3-1 pin definition
Pin No.
Item
Direction
Description
1
GND
-
Ground
2
GND
-
Ground
3
GND
-
Ground
4
GND
-
Ground
5
GPIO1
DI/O
Configurable multi-function IO port
（
see CMT2300A manual for details
）
6
GPIO2
DI/O
Configurable multi-function IO port
（
see CMT2300A manual for details
）
7
GPIO3
DI/O
Configurable multi-function IO port
（
see CMT2300A manual for details
）
8
VCC
-
Power 3.3V
9
GND
-
Ground
10
GND
-
Ground
11
SCLK
DI
SPI clock pin
12
SDIO
DI/O
SPI data pin
13
CSB
DI
SPI register accesser
14
FCSB
DI
SPI FIFO accesser
15
GND
-
Ground
16
GND
-
Ground
17
ANT
-
RF module stamp hole interface
，
impedance 50Ω
18
GND
-
Ground
