In my project that I shared the schematic, we separated the output of the bq24075 from the load with the switch.
Supervisor(active low/threshold 3.2V) and NOR gate driving our sysoff signal. Sysoff input is default low logic level.
This is what we would normally expect it to work in.
Case 1 :However, when we feed our system only with battery and switch is the open state, the sysoff is at low level as we expect.
Then,when we closed the switch and connect the output of bq24075 to the load, sysoff goes to a high level.
The output of the BQ24075 cannot feed the load.
Case 2 :When we feed our system only with USB or USB and battery are plugged in at the same time, our system works well.It doesn't matter in this case ,if the switch is off or on.
Case 3 :While The switch is off state in our system , USB and battery are plugged in, our system works well.
if we remove the USB at run time, our system maintained as work well and the sysoff remains at the low level as expected.
What could be the reason for this situation?