ESP32-A1S Specification V2.3
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Figure 10 DC-DC Step-down circuit diagram
6.3. 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 on the IO trace.
Figure 11 Level conversion circuit
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