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BQ40Z50-R1: Reserve Cap-cWh not applied when Load Mode = 1 (constant power)

Hamish Henderson
Prodigy 80 points
Part Number: BQ40Z50-R1

We have a constant power load, and hence have selected Load Mode = 1 (Section 6.2 of Tech Ref manual). We also wish to use the 'Reserve Capacity' feature. From Section 6.2 (relevant passage copied below)

Given we have Load Mode =1, we entered the reserved capacity in the 'Reseve Cap-cWh' section if the IT Cfg data memory. However, this did not seem to do anything; remaining capacity is unaffected by changing this value. However, changing the value in 'Reserve Cap-mWh' does change remaining capacity as expected, regardless of load mode. This seems to be incorrect behaviour.

The log file linked below shows that 'Reserve Cap-mWh' causes a change to remaining capacity (after a reset) regardless of Load Mode, and 'Reseve Cap-cWh' has no impact in either load mode.

/cfs-file/__key/communityserver-discussions-components-files/196/3566.res_5F00_cap.log

Please can you advise if this is a bug, known issue, or if there are other settings that must also be applied to use 'Reseve Cap-cWh'

  • 0
    TI__Mastermind 42535 points
    Hi,

    Your thread has been assigned to me. Please expect an answer in 5 working days or less.
  • 0 in reply to Batt
    TI__Expert 4645 points
    I have looked at your file and see the behavior you describe where only the reserve capacity in mAh seems to have an effect on the RSOC. I am looking into this further for a potential root cause. Can you send your complete file (.gg.csv) in a .zip file? Thanks.
  • 0 in reply to Steve Schnier
    TI__Expert 4645 points
    The issue is most likely that the CAPM bit in the 0x03 BatteryMode() register is set to 0 so the CAPACITY Mode is in mAh. If you change CAPM to 1, it will report in mWh, and should reflect your reserve capacity.
  • 0 in reply to Steve Schnier
    Prodigy 80 points

    Steve Schnier said:
    The issue is most likely that the CAPM bit in the 0x03 BatteryMode() register is set to 0 so the CAPACITY Mode is in mAh. If you change CAPM to 1, it will report in mWh, and should reflect your reserve capacity.

    Thanks, can confirm that CAPM is required to be in the same format as the reserve capacity, i.e.

    • CAPM = 0, Reserve Cap-mAh will be used
    • CAPM = 1, Reserve Cap-cWh will be used

    Load Mode has no effect on which reserve capacity is applied. The technical reference is incorrect and misleading!