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BQ27426: System Side Fuel Gauge BQ27426 or BQ27421

Shaival Shah
Prodigy 120 points
Part Number: BQ27426
Other Parts Discussed in Thread: GPCCHEM, BQSTUDIO

We are planning to use BQ27426 since it is system side gauge and also has pre generated profiles.

I wanted to know if it is suitable for system side use or not even though it is mentioned on the datasheet???

Also will accuracy of reading battery charge be affected by using pre-profiles of BQ27426 on the system side?

There is also another alternative BQ27421? Any suggestions on which one is better to use out of these two on the system side?

My battery pack is 6000 mAH Li/ion with two cells of 3000mAH in parallel.

Thanks

  • 0
    TI__Guru* 76230 points
    hi Shaival
    For best accuracy, i would recommend the bq27520 as that allows you program a suitable chem id for your cells

    if you still insist on using the bq27426, then first run the test outline in our online tool gpcchem to determine if the preprogrammed chem ids would work for your cells
    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Prodigy 120 points
    Hi Onyx,

    Thank you for your reply. Is there any way I can use BQstudio to generate require files for gpcchem? If yes, how?
    Is there a particular reason you suggest to use BQ27520 and not BQ27421 (the second alternative I recommended) ??
  • 0 in reply to Shaival Shah
    TI__Guru* 76230 points
    yes. pls watch the video in the link below:

    training.ti.com/chemistry-id-matching-online-gpc-tool

    the bq27520 is a flash based gauge meaning you have the ability to program a closely matched chem id which our online tool gpcchem returns as the best match for your cell.
    The bq27421 has only three hardcoded chem ids and your cell might not be a good match to those three. gpcchem will tell you if that is the case..
    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Prodigy 120 points
    Hi Onyx,

    Thank you for the link. I understand what you mean and will try this test on my side and confirm the chem id. I understand BQ27421 has LiCoO profiles and it might not match. But TI has not mentioned in the reference manual the same thing for bq27426. I will check in parallel for BQ27520 as well.

    So are the pre-generated profiles for generic Chem ID? If not, what CHEM ID does TI suggest to use with these pre -profiles?

    Thanks,
    Shaival
  • 0 in reply to Shaival Shah
    TI__Guru* 76230 points
    Hi Shaival,
    The gpcchem tool will tell you which to use if it is a match. If it isn't a match you can't use the bq27426.

    thanks
    Onyx