Chengdu Ebyte Electronic Technology Co.,Ltd
E78-400M22S user manual
Copyright ©2012–2019
，
Chengdu Ebyte Electronic Technology Co,;Ltd
4
Antenna
IPEX/Stamp hole
50 ohm impedance
IC
ASR6501
FLASH
128KB
RAM
16KB
Core
Cortex-M0
3.
Size and pin definition
No.
Name
Direction
Function
1
GND
Ground wire, connected to the power reference ground
2
VCC
Power supply, range 2.5-3.7v (external ceramic filter capacitor is
recommended)
3
SETB
Input/output
Ground wire, connected to the power reference ground
4
DIO1
Input/output
Multipurpose digital IO cannot be used as external GPIO
5
BUSY
Input/output
SPI busy indicator that cannot be used as an external GPIO
6
I2C_SDA
Input/output
I2C SCL pins
7
I2C_SCL
Input/output
I2C SDA pin
8
UART_CTS
Input/output
UART CTS pin
9
UART_RTS
Input/output
UART RTS pin
