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 a 256-µs INT pulse.

1. USB/adapter source identified (through PSEL or DPDM detection, and OTG pin)
2. Good input source detected
   • not in sleep
   • VBUS below V_ACOV threshold
   • current limit above I_BADSRC
3. Input removed or VBUS above V_ACOV threshold
4. Charge Complete
5. Any FAULT event in REG09

For the first four events, INT pulse is always generated. For the last event, when a fault occurs, the charger device sends out INT and latches the fault state in REG09 until the host reads the fault register. If a prior fault exists, the charger device would not send any INT upon new faults except NTC fault (REG09[2:0]). The NTC fault is not latched and always reports the current thermistor conditions. In order to read the current fault status, the host has to read REG09 two times consecutively. The 1^st reads fault register status from the last read and the 2^nd reads the current fault register status.