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Original question:

GPCCHEM: Bqstudio can not find chem ID

GPCCHEM: Chemistry ID 661 -- Is this obsolete?

Steve Butler1
Prodigy 200 points
Part Number: GPCCHEM
Other Parts Discussed in Thread: BQ34Z100, EV2400,

Hello Ti,

I am working on a BQ34Z100 project that has been in production a few years.  We are now having Gas Gauge performance problems and I am going through your recommended steps for developing a golden image based on the proper Chem ID and Learning Cycle.

Concern:

Our production Data Flash is using Chemistry ID #661.

1.  However, I do not find this number in your Chemistry DB (I have the most recent update).

2.  Your Online GPC tool has identified my battery chemistry to best match Chem ID #446.

Questions:

1.  Is Chem ID 661 now obsolete (as it no longer appears in your database?)

2.  Is Chem ID 446 the appropriate replacement for 661?

3.  How should I expect the BQ34 to react to having a Chem ID number that does not appear in your database?  Does the BQ34 revert to a default Chem ID?  Will it report an error?

Thanks,

Steve

  • 0
    TI__Guru** 102465 points

    Hello Steve,

    Once the chemistry ID is written it is not discarded or reverted back to default ID when connected to the EV2400, it will remain programmed.

    If you have not characterized your battery for some time then there may be a better match now (we continuously add new IDs)

    The previous ID may have been updated and given a new number, it best to use the one ID the CPCCHEM tool refers you to. It's always best to collect data on the individual cell level as well for the GPCCHEM tool.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 200 points

    Wyatt,

    Thank you for responding to my question.  I have just performed a new characterization of my battery and will use the 446 Chem ID provided.

    However, for troubleshooting purposes I am trying to understand how the BQ34 can use Chem ID 661 if this ID is no longer in the database.  

    - I do understand you point that if Chem ID 661 was written to the BQ34 long ago that it will remain and not be discarded.

    - However, I have been recently using this Chem ID to program data flash in brand new BQ34 devices.  In this case, I am assuming that if there is no 661 Chem ID in the BQ Studio tool, then nothing will be written to the Chem ID memory locations and they will remain whatever the default is.  Is this correct?

  • 0 in reply to Steve Butler1
    TI__Mastermind 24870 points

    Hello,

    In this case, I'd recommend doing a GPCCHEM test on your cell and making sure we identify an ID that is well-matched to this battery cell you are using.

    Thanks!

  • 0 in reply to Kang Kang
    Prodigy 200 points

    Hello,

    Yes.  I do plan to use the new GPCCHEM test id (446) from now on.  However, my company has shipped thousands units programmed with Chem ID 661 and is still doing so right now.  And we are having gas gauge problems.

    Critical Questions:

    1)  Has 661 ever been a valid Chem ID?

    2)  When did it go obsolete?

    Thanks,

    Steve

  • 0 in reply to Steve Butler1
    TI__Guru** 102465 points

    Hello Steve,

    It may have just been input into the database incorrectly and has a new ID now. I'm checking with the chem ID team.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Prodigy 200 points

    Hi Wyatt,

    Disregard my question about Chem ID 661.  661 was the update number--not the Chem ID.  Sorry for the confusion.