TB-05 Specification V1.0.0
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Page 18 of 21
Figure 13 DC-DC Buck Circuit Diagram
7.5. GPIO
Some IO ports are led out from the periphery of the module. If you need to use a resistor of
10-100 ohms in series on the IO port. This can suppress overshoot and make the level on
both sides more stable. It is helpful for both EMI and ESD
For the up and down of the special IO port, please refer to the instructions in the
specification, which will affect the startup configuration of the module
The IO port of the module is 3.3V. If the level of the IO port of the main control and the
module does not match, a level conversion circuit needs to be added
If the IO port is directly connected to the peripheral interface or terminals such as pins, it is
recommended to reserve ESD devices at the IO port wiring close to the terminals
Figure 14 Level convert Circuit
