After poor source detection, the device runs input source detection through the PSEL pin. The PSEL pin sets input current limit 0.5 A (HIGH) or 2.4 A (LOW). After input source type detection is completed, the PG pin is asserted to LOW and PG_STAT bit is set to 1 (BQ25619E only).

With I²C, after input source type detection is completed, an INT pulse is asserted to the host. in addition, the following register bits are updated:

1. Input Current Limit (IINDPM) register is updated from detection result
2. VBUS_STAT bit is updated to indicate USB or other input source
3. PG_STAT bit is updated to indicate good adapter plugs in (BQ25619E only)

The host can over-write the IINDPM register to change the input current limit if needed.