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Chengdu Ebyte Electronic Technology Co., Ltd.
3 Size and pin definition
No.
Name
1
M0
2
M1
3
RXD
4
TXD
5
AUX
Copyright ©2012–2018，Chengdu Ebyte Electronic Technology Co.,Ltd.
Direction
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. Ground
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 (can be suspended).
E22-400T30S User Manual
Function
7
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