ZHCSMR2B December 2020 – December 2021 BQ76942
When a Short Circuit in Discharge Latch or Overcurrent in Discharge Latch protection fault has occurred and the DSG FET is off, the device can be configured to recover when load removal is detected. This feature is useful if the system has a removable pack, such that the user can remove the pack from the system when a fault occurs, or if the effective system load that remains on the battery pack is higher than ~20-kΩ when the DSG FET is disabled. The device will periodically enable a current source out the LD pin and will recover the fault if a voltage is detected at the LD pin above a 4-V level. If a low-impedance load is still present on the pack, the voltage the device measures on the LD pin is generally below 4 V, preventing recovery based on Load Detect. If the pack was removed from the system and the effective load is high, such that the current source generates a voltage on the LD pin above a 4-V level, then the device can recover from the fault.