Cavli Wireless C100QM/C10QM Hardware Manual
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Figure 3-12 Full-featured serial port design
If you need to use a 2-wire serial port, you can refer to the following serial port design.
Figure 3-13 UART serial port design
The serial port of the module is TTL 1.8V level. If the serial port needs to be connected
to the MCU of 3.3V level, it is necessary to add a level conversion chip externally to
achieve level matching. For the chip connection method, refer to the following circuit: