JAJSFS8 July 2018 BQ25601D
The device powers internal bias circuits from the higher voltage of VBUS and BAT. When VBUS rises above VVBUS_UVLOZ or BAT rises above VBAT_UVLOZ , the sleep comparator, battery depletion comparator and BATFET driver are active. I2C interface is ready for communication and all the registers are reset to default value. The host can access all the registers after POR.