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Cannot UNSEAL bq27532

Alexander Goldin
Expert 1220 points

Good day.

I have sealed my fuel gauge and cannot unseal it back.

I use Unseal Key 0 and Unseal Key 1, but in vain.

Is there any way to unseal it?

Is there any way to rest all of device to the default state (factory reset)?

Thank you in advance

  • 0
    TI__Mastermind 24870 points

    Hello Alexander,

    Do you use the defaults or did you modify them yourself?

    Thanks,

    Kang Kang

  • 0 in reply to Kang Kang
    Expert 1220 points

    Good day, Kang!

    Thank you for reply.

    I use defaults ( 0x0414 ,  0x3672 ). I write them in the proper bytes order:  wr 0x00 0x14 0x04 ;  wr 0x00 0x72 0x36 .

    There is an example in the datasheet, so I work accordingly.

    I have tried to play: change bytes order, change keys order, etc. Nothing. Control Status has both of seal bits '1'.

    Frankly speaking, I already have had certain problems - I never succeed to read DataFlash.

    I always read zeroes from any location (even CheckSum), notwithstanding with the real data stored there.

    After several experiments I have sealed my device just to try to unseal it back. Something should work. Nothing.

    From the other hand, I do succeed to receive proper data via Standard Command and Control Subcommands.

    So I suppose, my I2C communication works right.

    I don't know what is going wrong.

    Is there any way to total reset all of device? Now I cannot reset it due to sealed state.

    Thank you.

    Alexander.