SLUUBT5C November 2018 – June 2021 BQ40Z80
Set Settings:Pin Configuration[MFP16_SEL0][MFP16_SEL1] = 01 to select PDSG. When this mode is selected, the pin is used as an enable pin to cause an NFET to pull down a PFET gate. The PFET enables/disables PRE-DISCHARGE mode to slowly charge up the load before the DSG FET is turned on. This pin is driven low to turn off the NFET and to let the PFET gate be pulled high, disabling PRE-DISCHARGE mode. It is driven high to turn on the NFET and PFET and to enable PRE-DISCHARGE mode. A pullup resistor from the PFET gate to BAT ensures that the PFET gate turns off when the pin is driven low and the NFET is off. A pulldown resistor from the NFET gate to VSS ensures that the NFET turns off while the gauge is in SHUTDOWN (and this pin is high-Z).