本文解析了当使用高于标准电压的适配器为手机充电时，为何手机仍能正常充电的原因。核心在于PMI8940芯片的支持范围，其最高支持9V适配器，并具有过压保护功能。通过调整相关寄存器设置，可以限制充电器仅支持5V输入，以增强设备的安全性和稳定性。
HW
MSM8917
PM8937
PMI8940
Question :
Recently, I connect usb cable with 10V to the phone.
Why does the phone still charging ? Why it not stop charging ?
Solution :
Because pmi8940 support up to 9V adapter, it's ovp up to 10.3V
You also can set related registers to support only 5V adapter,
it's ovp has two option,
You can refer pmi8940 spec 0x13f1 register
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