1. 先看模块引脚，利尔达NB86-G模块
2. VDD_IO_R1, VDD_IO_R2, VDD_IO_L1 and VDD_IO_L2 control the IO voltages on PIOs 0-9, 10-21, 22-33 and 34-39 respectively. Each supply rail may have a different voltage to interface with external systems or the RF front-end components
不同的GPIO由不同的电压域控制，电压域的引脚如下