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BQ27742-G1: Problem with sealed to unsealed

user6101960
Prodigy 40 points
Part Number: BQ27742-G1
Other Parts Discussed in Thread: EV2400

Hi, i have connected my EV2400 with bq27742. I would like to calibrate gauge and program chem id but it seems that i cannot get out of the sealed mode. 

  • 0
    TI__Guru* 76230 points

    Hi

    Your are not yet in full access mode. The FAS flag is set. You need to click the unseal full access button in the command window on the right to get the device into full access mode.

    thanks

    Onyx

  • 0 in reply to Onyx Ahiakwo
    Prodigy 40 points

    Thanks Onyx for response.

    In full  access mode I still can not get chem id programmed (error code = 1470 )or calibrate voltage.

    Maybe I am missing some datasheet?

  • 0 in reply to user6101960
    TI__Guru* 76230 points

    Looks like you have a bad chip. Cell voltage is reading 0. Cell temp is reading -39.1C

    You likely need to replace the IC.

    thanks

    Onyx

  • 0 in reply to user6101960
    Prodigy 170 points

    Hi,

    Please check Your cell. In previous picture its voltage was 1.905V, which is extremely low for Li-Ion. Its actually dead cell. Your recent screenshot contains 0V measurement. The -39.1Deg.C temperature value may be because of the extremely wrong cell voltage. If You would replace cell so its voltage will be in a reasonable range (2.7-4.2V), You must check that the voltage is above the value mentioned in "Data Memory->Configuration->Power->Flash Update OK Voltage". What I have learned that there will be no flash updates (including chem id programming) if the cell dropped below that value.

    Best Regards,

    Boris.

  • 0 in reply to Boris Risenzon
    Prodigy 40 points

    Hi,

    I think that problem is with IC, because I have checked cells and there is nothing wrong. It might be invalid soldering process or broken IC, I will check it out.

    Thanks for response!

    Rafał