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[FAQ] BQ25798: Recommended backup mode operation

Part Number: BQ25798

Tool/software:

Backup mode is expected to work as follows:

 Host software sets (arms) EN_BACKUP=1 while input source is attached at VBUS

 Input voltage fails below backup mode trigger point = %*VINDPM

Backup mode engages setting Disable both ACDRV =1  then EN_OTG=1 to regulate PMID = VOTG

      VBUS Status reports backup mode

     VINDPM status reports VINDPM/VOTG

     VAC1 status reports not present since input source was removed

 Host software periodically Monitors for VAC1 status = present

 Input source reattached

      AC1 present status changes to VAC1 present

 Host software sets Force ACFET1 on =1  which causes charger to auto set DISACDRV=0

      VBUS Status changes to Normal OTG Mode

 Host writes EN_OTG=0 in order to switch back to input source

 Charger reenters charge mode, assuming EN_CHG=1 and /CEpin=0 and auto sets EN_BACKUP=1 (rearms)