ZHCSD75D March 2014 – January 2018
In this mode, an undervoltage protection (UVP) fault mode is entered when the voltage on the VBAT pin continuously falls below the VUVP threshold for longer than the tUVP delay time. The fuel gauge then enables the charger attachment detection circuitry and, if no charger is found, sends the fuel gauge into ANALOG SHUTDOWN mode to minimize power consumption and avoid further discharge of the battery. The UVP fault is cleared once charger attachment is detected and the cell voltage rises above VUVPREL, which causes the fuel gauge to transition to NORMAL mode.
The fuel gauge can enter this mode from LOW VOLTAGE CHARGING mode when the battery pack is being charged from a deeply discharged state or from NORMAL mode when the battery pack is being discharged past the UVP threshold.