The device integrates both overcurrent and overvoltage protection for the battery. The device monitors the battery voltage on BATP and BATN. In order to reduce the possibility of battery terminal shorts during manufacturing, series resistors on BATP and BATN are required. VBAT measurement accuracy must be met with a 100-Ω series resistor, but the device must still be operational with a 1-kΩ resistor. The device is intended to be operated within the window formed by the BAT_OVP and BAT_OVP_ALM. When the BAT_OVP_ALM is reached, an interrupt is sent to the host to reduce the charge current and thereby reaching the BAT_OVP threshold. If BAT_OVP is reached, charging stops, the CHG_EN bit is set to ‘0’, and the start-up sequence must be followed to resume charging.

A fixed VOUT_OVP threshold is implemented to protect the device if the battery is removed.

The device monitors current through the battery by monitoring the voltage across the external series battery sense resistor. The differential voltage of this sense resistor is measured on SRP and SRN. The device is intended to be operated within the window formed by the BAT_OCP and BAT_OCP_ALM. When the BAT_OCP_ALM is reached, an interrupt is sent to the host to reduce the charge current from reaching the BAT_OCP threshold. If BAT_OCP is reached, charging stops, the CHG_EN bit is set to ‘0’, and the start-up sequence must be followed to resume charging.

Comparator based for all battery overvoltage alarms and protections.