• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 64 subscribers
  • Views 721 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ28Z610: Cycle Count Update

B-A
Intellectual 720 points
Part Number: BQ28Z610

Hello,

My question is about the cycle count parameter not incrementing. I am running a bq28z610 fuel gauge in 1S mode. I have fully charged a cell, passing through the cycle count percentage (which I have set to 90%), and discharged the cell below 90%. However, the cycle count does not increment. According to the TRM, the cycle count state is defined as follows in 13.6.10:

As previously stated, cycle count percentage has been set to 90%. I have passed through this threshold in both directions (charge/discharge) with no effect on the cycle count. Is there something else the cycle count is dependent upon that the fuel gauge is looking for?

  • 0
    TI__Mastermind 42535 points
    Hi,

    Have you enabled IT? The thresholds are based off your design capacity. So, please make sure that is consistent with Qmax and FCC.
  • 0 in reply to Batt
    Intellectual 720 points

    Hi Batt,

    Thank you for the suggestion. I can confirm that ITEN was enabled during the cycle test, as seen below:

    I ran another charge on the cell but the cycle count did not update.

    The most recent FCC is 3353mAh. The Design Capacity is 3500mAh. The CCT bit is configured as 0 (using Design Capacity by default).

    Could you explain what you mean by "make sure that is consistent with Qmax and FCC"?

  • 0 in reply to B-A
    TI__Expert 5090 points

    Note that Cycle Count Percentage isn't a threshold that you pass to have it counted as a cycle, it is the amount of charge that needs to be passed to have it count.  So if you have it set to 90%, you need to discharge from 100% to <10%, for example.  

    Thanks,

    Terry

  • 0 in reply to -Terry
    Intellectual 720 points
    Yep, I was thinking about it differently. I changed the percentage and retested with success. Thank you Terry.