SLUUCW9 December 2023 BQ76972
The BQ76972 device integrates a Secondary Protector (2LVL) Permanent Fail, which can permanently disable the pack if an external secondary protector has detected a fault and is attempting to blow the fuse. The BQ76972 device monitors the level of the FUSE pin each second (in NORMAL and SLEEP modes), and if it detects the pin is being asserted by the secondary protector for Permanent Fail:2LVL:Delay seconds, a 2LVL PF fault is generated. This PF check is enabled by setting the Settings:Permanent Failure:Enabled PF B[2LVL] and Settings:Manufacturing:Mfg Status Init[PF_EN] configuration bits.