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Wireless UART Module
3.1.2 Pin Definition
Pin No.
Pin item
1
M0
2
M1
3
RXD
4
TXD
5
AUX
6
VCC
7
GND
8
ANT
9
GND
10
GND
11
GND
4. Recommended Circuit Diagram
No.
1
The UART module is TTL level. Please connect to MCU of TTL level.
2
For some MCU working at 5VDC, it may need to add 4-10K pull-up resistor for the TXD & AUX pin.
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Pin direction
Input
Work with M1 & decide the four operating modes.
（weak pull-up）
Floating is not allowed, can be ground.
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
Output
the procedure of self-check initialization, the pin outputs low level. Can be
configured as open-drain output or push-pull output.
Input
Power supply 2.1V-5.5V DC.
Input
Ground electrode
Output
Reference places of high frequency signal output
Input/Output
Antenna interface（ high frequency signal output）
Input
Ground electrode
Input
Ground electrode
Description（STM8L MCU）
User Manual of E64 Series Modules
Pin application
(Floating is
allowed).
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