1. Usedforopencircuit, short circuit and 680 ohm load diagnosis between MIC+ and MIC- signals；

2. Used for choose external power supply as MIC+ input and  whether DETECTand DETECT_GND are connected.

3. Usedfor on-offcontrol of two USB2.0 ports；

4. Usedforopen circuit, short circuit and 680 ohm load diagnosis between the power andground of the USB port;

5. Used for choose external power supply as USB 5V power

6. Used for open circuit, short circuit and 680 ohm load diagnosis between +/- ofSMA port;

PS: Duringdiagnosis, the voltage is sampled by the AD of MCU