RF SOLUTIONS BLE-PB03, User Manual

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BLE-PB03
DS-BLE-PB03-1
7.4. GPIO
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Some IO ports are lead outside the module, if using, a proposed resistance of 10-
100 ohms on the IO port. This suppresses the overshoot and enables smoother
levels on both sides, helping for both EMI and ESD.
•
The up and down of the special IO port should refer to the use instructions of the
specification, which will affect the start-up configuration of the module.
•
The IO port of the module is 3.3V,if the main control does not match the IO port
level of the module, the level conversion circuit should be increased.
•
If the IO port is directly connected to the peripheral interface, or terminals such
as pin header, it is recommended to reserve ESD devices at the IO port line near
the terminal.
Figure 13 Level convert circuit