The interrupt is used to signal some of the critical events to the microcontroller via the INT pin in the SPI mode. In the SPI mode, INT pin is a push-pull output stage. When an interrupt-generating event takes place, the INT pin is pulled low.

Following events can generate interrupt and the corresponding bits are set in the interrupt register:

• Thermal Shutdown (TSD_INT)
• A valid wake-up pulse received on CQ (WU_INT)
• DO output overcurrent fault (DO_FAULT_INT)
• DO output overcurrent fault (CQ_FAULT_INT)
• LP falls below warning threshold (LPW_INT)
• V5IN falls below UVLO threshold (UV_V5_INT)
• Temperature reached above the thermal warning threshold (TEMP_WARN)

Individual interrupt events can be masked via INT_MASK register. When an interrupt is masked, that particular event does not activate the INT pin. However, interrupt bit is set if the interrupt generating event occurs.

The interrupt bits are not cleared automatically when the interrupt generating event is no longer present. The interrupt bit needs to be cleared explicitly by the microcontroller. The INT pin goes high when all interrupt bits are cleared by the MCU (cleared on read) and the event does not persist. INT pin also goes high if all the interrupt bits are masked. If the interrupt bits are unmasked and if any of the interrupt bits are still set, the INT pin goes low again.