In some applications, the host does not always monitor the charger operation. The INT notifies the system on the device operation. The following events will generate 256-µs INT pulse.

• USB/adapter source identified (through PSEL or DPDM detection, with OTG pin)
• Good input source detected
  • VBUS above battery (not in sleep)
  • VBUS below V_ACOV threshold
  • VBUS above V_VBUSMIN (typical 3.8 V) when I_BADSRC (typical 30 mA) current is applied (not a poor source)
• Input removed
• Charge Complete
• Any FAULT event in REG0C

When a fault occurs, the charger device sends out INT and keeps the fault state in REG0C until the host reads the fault register. Before the host reads REG0C and all the faults are cleared, the charger device would not send any INT upon new faults. To read the current fault status, the host has to read REG0C two times consecutively. The 1^st read reports the pre-existing fault register status and the 2^nd read reports the current fault register status.