We have a condition in which some batteries will be in a shutdown mode. In shutdown, the battery output voltage is 0 VDC, we have no serial communications, and so the only way to bring it out of shutdown is to apply > 5 VDC to the battery terminal.
Using the reference design found on page 1 of the "bq25700A" datasheet with 12V external power . While there is not a reference designator for the MOSFET in question (also referred to as the BAFET), the gate connects to the active low pin BATDRV. We have tried different modes of operation - the buck/boost is active, including ,Q4 which puts +12 VDC on the source of the BAFET, we need to be able to bring its gate low for just a short period to bring our battery out of shutdown mode. The pin CEL_BATPRESS is tied high to pin REGN pin and everything else is configured per the other reference designs.
If we apply a battery not in shutdown mode, everything runs as it should.
Is there a way to control the BAFET for just long enough to bring out battery out of shutdown mode?
