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Original question:

BQ76942: Charging IC, Fuel Gauge and MCU recommendation

BQ76942: Suitable Fuel Gauge for the AFE?

AhtoM
Prodigy 40 points
Part Number: BQ76942
Other Parts Discussed in Thread: BQSTUDIO, BQ78350-R1A, BQ34Z100-R2

Greetings,

Related to this topic, but having more narrowed down question.

  • Does the BQ769x2 series even need a fuel gauge and/or
  • What is the suitable fuel gauge for this AFE in your portfolio that also works with BQStudio ?

I've looked at BQ78350-R1A with CEDV algorithm (we're having 6S1P, 32Ah+ high pulse load and quite often full discharge application) but the product info states that it is only for BQ769x0 series AFE-s. Is this true that it is not suitable for BQ769x2 series ?

# Edit

Upon reading This Appnote about Impedance Tracking benefits, finding this Post #1 and Post #2 I'm a bit mixed.
Tough call. I think since the high current pulsing is not that frequent (more like peak current conditions at extreme events) I would guestimate the IT algorithm should be able to track the SOC accuracy decently, since the battery does tend to discharge completely more often than not, which allows the impedance to be tracked during different charge levels.

Thus BQ34Z100-R2 with Impedance Tracking could even be an option(?).

  • +1
    TI__Mastermind 25605 points

    Hi Ahto,

    We typically recommend pairing the BQ34Z100-R2 with the BQ769x2 family. The BQ769x2 family of devices provides all of the tool to implement a gauging algorithm yourself on an MCU, however you may find it better to use the BQ34Z100-R2 as the IT algorithm will provide the best accuracy. 

    If you have questions on the details of the gauge or the gauging algorithm, I recommend opening a new E2E thread with the gauges team, who are better equipped to help answer those questions.

    Regards,

    Max Verboncoeur