The PG_STAT bit goes HIGH to indicate a good input source when:
- VBUS above VVBUS_UVLO
- VBUS above battery (not in sleep)
- VBUS below VVAC_OV threshold
- VBUS above VVBUSMin (typical 3.8 V) when IBADSRC (typical 30 mA) current is applied (not a poor source)
- Completed input Source Type Detection