SLUUBY1B December 2020 – April 2022 BQ76942
The voltage ADC regularly measures the top of stack voltage through an internal divider and reports this in 0x34 Stack Voltage(). It also compares this measurement to the sum of the individual cell voltage measurements and can trigger a Top of Stack PF (TOSF) and disable the battery pack if they differ excessively. This PF can be enabled by setting the Settings:Permanent Failure:Enabled PF D[TOSF] and Settings:Manufacturing:Mfg Status Init[PF_EN] configuration bits, and the fail threshold and delay are set by Permanent Fail:TOS:Threshold and Permanent Fail:TOSF:Delay. This check is not performed if the current is beyond Power:Sleep:Sleep Current, in order to avoid false triggers due to a dynamic load.