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

1. Valid input source conditions detected (see conditions for PG pin)
2. Valid input source conditions removed (see conditions for PG pin)
3. Entering IAC_DPM regulation through register or ILIM_HIZ pin
4. Entering VAC_DPM regulation through register or ACUV pin
5. I²C Watchdog timer expired
6. Charger status changes state (CHARGE_STAT value change), including Charge Complete
7. TS_STAT changes state (TS_STAT value change)
8. Junction temperature shutdown (TSHUT)
9. Battery overvoltage detected (BATOVP)
10. A rising edge on any of the *_STAT bits

Each one of these INT sources can be masked off to prevent INT pulses from being sent out when they occur. Three bits exist for each one of these events:

• The STAT bit holds the current status of each INT source
• The FLAG bit holds information on which source produced an INT, regardless of the current status
• The MASK bit is used to prevent the device from sending out INT for each particular event

When one of the above conditions occurs (a rising edge on any of the *_STAT bits), the device sends out an INT pulse and keeps track of which source generated the INT via the FLAG registers. The FLAG register bits are automatically reset to zero after the host reads them, and a new edge on STAT bit is required to re-assert the FLAG.

Figure 7-6 INT Generation Behavior Example