ZHCSHU6L march 2018 – august 2023 BQ77915
PRODUCTION DATA
An OV fault detection occurs when at least one of the cell voltages is measured above the OV threshold, VOV for a time of OV delay, tOVn_DELAY. The CHG FET is turned off. The OV fault recovers when the voltage of the cell in fault is below the (OV threshold – OV hysteresis, VHYS_OV) for a time of OV delay.
The device assumes an OV fault after reset, and clears automatically after an OV delay if all cell voltages are below the OV threshold minus hysteresis. In the event of an overvoltage fault condition on a particular cell, the balancing FET corresponding to that cell is turned on until the cell voltage drops to the full charge voltage or until the cell has recovered from overvoltage fault condition, whichever occurs earlier. See Cell Balancing for more details.
The state comparator is turned on when CHG is turned off. If a discharge current is detected, the device immediately switches the CHG back on. The response time of the state comparator is typically in 700 μs and does not pose any disturbance in the discharge event.