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BQ27742-G1: BQ27742-G1

kavya medandi
Prodigy 170 points
Part Number: BQ27742-G1

Hi,

I'm currently working on bq27742. Till now there is no issue while unseal of the IC. But when I tried to check a scenario, like while updating data flash parameters, knowingly I removed battery. So the flash is not updated properly. Then, I tried to unseal the IC using BQ Studio. But, the Full Access Unseal command is not happening to work. When I saw the FAS,SS bit are HIGH only. Not going to LOW state. Can you suggest any solution, how I can go into unseal state.

Thanks & Regards,

Kavya.  

  • 0
    TI__Guru 51466 points

    Unsealing (and Full Access) requires two consecutive words written to the gauge. The auto-refresh may interfere with this. Please disable auto refresh (click on the green line in the Dashboard, top left. It'll turn red when auto refresh is disabled).

    Wait 4 seconds to let the two word command state machine time out.

    Then click on Unseal (this is the first step). Check that SS is 0 (click on Refresh to update this manually).

    Then click on Unseal Full Access. Check that FAS is 0 (click on Refresh to update this manually).

  • 0 in reply to Dominik Hartl11
    Prodigy 170 points

    Hi Dominik,

    I tried your suggestion, but unable to get out of sealed state. Can you suggest other way.

    Thanks & Regards,

    Kavya.

  • 0 in reply to kavya medandi
    TI__Guru 57747 points

    Hello Kavya,

    If you removed power while programming the srec, then it can cause data corruption. The bq27742 would be unpredictable when the data is incorrect ( wrong instruction flash). I would treat this unit as bricked.

    Note that if you try this on another unit, it may work fine because there are safeguards to prevent this from happening but there is only so much that can be done.

    I would recommend that you try to reprogram the srec a few times. If that succeeds, then you would have recovered the bq27742.