Chengdu Ebyte Electronic Technology Co.,Ltd..
E52-400/900NW22S User Manual
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Copyright ©2012–2023, Chengdu Ebyte Electronic Technology Co.,Ltd.
7
IV. Recommended Connection Diagram
Serial
number
Brief connection instructions between the module and the microcontroller (the above figure takes
the STM8L microcontroller as an example)
1
The wireless serial port module is TTL level, please connect it to a 3.3V TTL level MCU.
2
When using a 5V microcontroller, please perform UART level conversion.
3
TVS protection and capacitors need to be added to the outside of the power supply (it is recommended to
add a 22uF low ESR electrolytic capacitor or tantalum capacitor).
4
The RF module is sensitive to pulse static electricity. Please do not hot-swap the module.
5
There is no LDO inside the module. It is recommended to connect an external 3.3V LDO for power
supply.
