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BQ40Z50: bq40Z50 charge voltage/charge current degradation

Evgeniy Leyvi
Prodigy 40 points
Part Number: BQ40Z50

The –r2 version of bq40z50 is capable of performing cycle-count based charge voltage/charge current degradation, if appropriate bit (cycle_degrade) is set in the registers (p 42 of tech reference sluubk0a). Does this function use 0x17 register (CycleCount) as the basis for the function? CycleCount counts the number of discharges (just to verify)? Is it possible to completely disable charging based on the CycleCount number with the -r2 GG version?

This degradation feature is not present in the –r1 version as it looks from the spec. Any internal function of setting manipulation, which can perform a similar charge disable?

Thank you!

  • 0
    TI__Expert 6575 points
    Hi Evgeniy,
    Yes the cycle count degradation is based on the 0x17 CycleCount().
    Cycle count will increment if the accumulated discharge is more than the set "Cycle" percentage of FullChargeCapacity() (if [CCT] = 1) or DesignCapacity() (if [CCT] = 0).
    In bq40z50-R2, the Degradation Mode current setting can be set to 100% to disable charging.
    This feature is not available in bq40z50-R1 and must be handled appropriately by the host.
    Regards,
    Swami