bq25504需要给超级电容设置过放保护电路吗？Battery Undervoltage Protection中提到
To prevent rechargeable batteries from being deeply discharged and damaged, and to prevent completely
depleting charge from a capacitive storage element, the undervoltage (VBAT_UV) threshold must be set using
external resistors.
是不是芯片内部有电池过放保护电路？
