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BQ40Z50-R2: VOK not set when starting initial discharge in learning cycle

Phil2010
Expert 4735 points
Part Number: BQ40Z50-R2

Hi,

one of our customers experiences difficulty to start the learning cycle. Expectation is that VOK is set when initial discharge starts. However, looking at the log file (attached), VOK is never set.

Please advise what needs to be done to get VOK set and start the learning cycle correctly.

BR,
Philinit_dsg.log

  • 0
    TI__Guru** 105760 points

    Hello Phil,

    From looking at the logs the VOK is set, but never cleared. If there was a charge just before the start of the log and the batteries were not rested long enough the VOK bit probably had not cleared yet.

    You can follow the learning cycle guide SLUA903 which describes the conditions better for completing the learning cycle.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    TI__Expert 4735 points

    Hi Wyatt,

    looking at the log, I expect that VOK should be shown in column AL "ITStat". Value observed is 0x0014, which changes to 0x0094 during discharge. To me, this indicates that at the beginning, bits QEN and RDIS are set (0x0014). Later on, NSFM is set in addition (0x0094). However, VOK is never enabled. In such case, I expect that the value would change e.g. to 0x001C.

    Where do you observe that VOK is set?

    BR,
    Phil

  • 0 in reply to Phil2010
    TI__Guru** 105760 points

    Hello Phil,

    I reviewed them again and must've looked at the wrong column. Has your customer followed the learning cycle guide? This has a step-by-step of what should be done and the registers that need configured/commands to send before starting.

    Can you also send the .gg file and a log file with 4 second intervals of the full discharge? It will help to debug the issue.

    Guide: e2e.ti.com/.../Achieving-the-Successful-Learning-Cycle.pdf

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    TI__Expert 4735 points

    Hi Wyatt,

    customer followed the instructions once again and was able to complete the cycle.

    Thanks for your support,
    Phil