When a battery is in normal operation and the V– pin is equal to or higher than the discharge overcurrent threshold for a time greater than the discharge overcurrent detection delay, the DOUT pin is pulled low to turn OFF the discharge FET and prevent further discharge of the battery. This is known as the discharge overcurrent status. In the discharge overcurrent status, the V– and VSS pins are connected by a constant current sink I_V–S. When this occurs and a load is connected, the V– pin is at BAT potential. If the load is disconnected, the V– pin goes to VSS (BAT/2) potential.

This device detects the status when the impedance between Pack+ and Pack– (see Figure 26) increases and is equal to the impedance that enables the voltage at the V– pin to return to BAT – 1V or lower. The discharge overcurrent status is restored to the normal status.

Alternatively, by connecting the charger to the system, the device returns to normal status from discharge overcurrent detection status, because the voltage at the V– pin drops to BAT – 1V or lower.

The resistance R_V–D between V– and BAT is not connected in the discharge overcurrent detection status.