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5.4 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. This 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, you need to add a level conversion circuit.
(4)If the IO port is directly connected to a peripheral interface, or a terminal
such as a header, it is recommended to reserve an ESD device near the terminal
of the IO trace.
6. Module internal chip connection table
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