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Chengdu Ebyte Electronic Technology Co., Ltd.
No.
Name
1
M0
2
M1
3
RXD
4
TXD
5
AUX
6
VCC
7
GND
8
Fixing hole
9
Fixing hole
10
Fixing hole
4. Recommended wiring diagram
No.
1
The UART module is TTL level, please connect with the MCU of TTL level.
2
For some MCU works at 5VDC, it may need to add 4~10K pull-up resistor for the TXD & AUX pin.
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Direction
Input
Work with M1 & decide the four operating modes.
Floating is not allowed, can be ground.
（weak pull-up）
Input
Work with M0 & decide the four operating modes.
（weak pull-up）
Floating is not allowed, can be ground.
TTL UART inputs, connects to external (MCU, PC) TXD output pin. Can be
Input
configured as open-drain or pull-up input.
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. During the
Output
procedure of self-check initialization, the pin outputs low level. Can be configured
as open-drain output or push-pull output (floating is allowed).
Power supply 2.3V~5.5V DC
Input
Ground
Input
Fixing hole
Fixing hole
Fixing hole
Function
Description（STM8L MCU）
E34-2G4D27D User manual
5
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