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bq28z560 - Unseal with Eval SW

Eric Stutzenberger
Intellectual 535 points

Hi,

I have the Eval software talking to the bq28z560 on my custom hardware board.  I have been using it to configure the data flash parameters.  In doing so, I let the unit run over night to allow it to adjust parameters for the gas gauging.  When I came back in the morning, the part had sealed itself.  I am not aware of sending any commands to the part to tell it to enter full-access sealed and/or sealed mode.  But, regardless of how it happened, I have not had much luck unsealing the part.  

How can I do this with the eval software?  As far as I know, the unseal keys should be the default keys.  I suppose it is possible, however unlikely, that they were changed.

Thanks,

Eric

  • 0
    TI__Guru* 76230 points

    Hi Eric,

    Once you seal the device, the device can never permanently return to unsealed or full access mode except you reprogram your device with the default senc file.

    In order to unseal the device,  write data block 0x0414, 0x3672. This will be in little endian format, meaning in the i2c pro screen, in the write i2c data block you write 1404 and hit write data, then 7236 hit write data,

     

    to put the device in full access mode, write data block 0xffff,  0xffff

     

    thanks

    Onyx