Specifications

Ra-01SH Specification V1.1
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5
、
Use of GPIO port
（
1
）、
There are some GPIO ports on the periphery of the module. If you need to use it,
it is recommended to connect a 10-100 ohm resistor in series with the IO port. This can
suppress overshoot and make the levels on both sides more stable. It is helpful for EMI
and ESD.
（
2
）、
For the pull-up and pull-down of special IO ports, please refer to the instructions
in the specification, which will affect the startup configuration of the module.
（
3
）、
The IO port of the module is 3.3V. If the main control and the IO level of the
module do not match, a level conversion circuit needs to be added.
（
4
）、
If the IO port is directly connected to a peripheral interface or terminal such as a
header, it is recommended to reserve an ESD device near the terminal of the IO trace.
Image Level conversion circuit