Chengdu Ebyte Electronic Technology Co., Ltd.
E29-400TXXX product data sheet
Copyright ©2012–2023
，
Chengdu Ebyte Electronic Technology Co.,Ltd.
10
Pin No.
Pin Name
Pin Direction
Pin Function
1
M0
Input
（
pull-up
）
Work with M1 to decide 4 working modes of module (not float, if not
used, could be grounded).
2
M1
Input
（
pull-up
）
）
Work with M0 to decide 4 working modes of module (not float, if not
used, could be grounded).
3
RXD
Input
TTL UART inputs, connects to external TXD output pin.
4
TXD
Output
TTL UART outputs, connects to external RXD input pin.
5
AUX
Output
Used to indicate the working status of the module;
For user to wakes up the external MCU and it outputs low level during
power-on self-check initialization; (can be left floating)
）
6
VCC
Power supply
Module power positive reference, voltage range: 2.6
～
5.5V DC
7
GND
Power supply
Module ground
8
Fixed hole
Fixed hole
（
connect with module GND
）
9
Fixed hole
Fixed hole
（
connect with module GND
）
10
Fixed hole
Fixed hole
（
connect with module GND
）
Chapter 4 Recommended Connection Diagram
No.
Brief instructions for the connection between module and MCU (Take STM8L as an example)
1
The wireless serial port module is TTL level, please connect with TTL level MCU
2
For some 5V microcontrollers, it may be necessary to add 4-10K pull-up resistors to the TXD and AUX
pins of the module.
