Provide case details or comments: If SRN voltage is greater than VCC, indicating that a battery is the power source, the BQ24650 enters
low quiescent current (< 15 µA) SLEEP mode to minimize current drain from the battery.
VCC设置5.5V ， 电池电压8V， SRN测量8V，VFB=1.3V, 此时电池供电， 电池的功耗为70uA, 规格书是《15UA
