Chengdu Ebyte Electronic Technology Co., Ltd
E32-900T30D User Manual
Copyright ©2012–2021
，
Chengdu Ebyte Electronic Technology Co.,Ltd.
7
3 Size and pin definition
No.
Name
Direction
Function
1
M0
Input
（
weak pull-up
）
With M1, the four working modes of the module can be determined (it
cannot be suspended, and it can be grounded if it is not used).
2
M1
Input
（
weak pull-up
）
With M0, the four working modes of the module can be determined (it
cannot be suspended, and it can be grounded if it is not used).
3
RXD
Input
TTL UART input ,Connect to external TXD output pins; Can be configured
as drain open circuit or pull up input, see parameter Settings
4
TXD
Output
TTL UART output, Connect to external RXD input pin; Can be configured as
drain open circuit or push - pull output, see parameter Settings
5
AUX
Output
Used to indicate the working status of the module; The user wakes up the
external MCU and outputs low level during self-test initialization; Can be
configured as drain open output, or push-pull output, see parameter Settings
(can be suspended)
6
VCC
Input
Positive reference of module power supply, voltage range: 3.3v ~ 5.5V DC
