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BQ34Z100-R2: BQ34Z100-R2

John DeCesare
Intellectual 280 points
Part Number: BQ34Z100-R2
Other Parts Discussed in Thread: BQ76952, BQ78350-R1A, BQ7830, , BQ34Z100, BQ76940, TIDA-010030, BQ76200, BQ7718

Hi,

I am designing a battery management system for a variety of battery stacks.  The stacks will be 4, 10 and 14 cells and I would like to have a single board with population SKU's.  The BQ76952 seems to be a very good fit but I also need a fuel gauge. The battery will be about 250Ah so the BQ78350-R1A seemed to be a good fit in terms of capacity.

But looking that the datasheet, it seems as if it is geared to the BQ769x0 family of AFE's. I like the way it interfaced to the AFE via I2C and used the coulomb counter on the AFE and basically seemed to control the AFE.  I could use the BQ769x0 but since they come in different package sizes, I would need three PCB's. which is not optimal

Question #1.  Can the BQ7830 be used with the BQ76952? And if so, do you have reference schematics?

In another forum regarding the BQ76952, the BQ34Z100-R2 was recommended.  This has a different interface and seems to have it's own coulomb counter and shares the sense resistor of the AFE.  Seems a little redundant but if it is a good solution and allows me a single PCB, then I can use that. 7000Ah is over kill but again, if it works..

Question #2.  Is there a reference design using the BQ34Z100 and the BQ76952?

If there are other solutions for this particular application, I am very open to ideas!!!

Thanks!

John

  • 0
    TI__Genius 17545 points

    Hi John,

    Q1) Looping in Monitor Team for recommendation.

    Q2) Unfortunately, there is not a reference design for the BQ76952 only with the BQ76940, linked below.

    TIDA-010030 reference design | TI.com

    Regards,

    Evan

  • 0 in reply to Diego
    TI__Mastermind 36640 points

    Hey John!

    I answered in the other E2E post. Slight smile

    Just want to add a small comment based on this:

    John DeCesare said:
    In another forum regarding the BQ76952, the BQ34Z100-R2 was recommended.  This has a different interface and seems to have it's own coulomb counter and shares the sense resistor of the AFE.  Seems a little redundant but if it is a good solution and allows me a single PCB, then I can use that. 7000Ah is over kill but again, if it works..

    Yes, both have the coulomb counter, but the BQ34Z100 uses the impedance track algorithm, which takes into account much more than the coulomb counting in order to provide accurate gauging. It can calculate the impedance of the battery and how it is affected based on temperature/load, etc, in order to provide more accurate SoC and SoH than what you'd be able to do with more simple methods of gauging algorithms. 

    The BQ76952 does not have any algorithm, so you could actually create your own algorithm based on all the information that the device can provide you. It may however not be as accurate as the impedance track gauge. Which Evan and the gauge team can help with, if there are more detailed questions.

    The TIDA Evan shared is also a good resource to see how these would be set-up. It would be very similar to the BQ76952 too.

    Best Regards,

    Luis Hernandez Salomon

  • 0 in reply to Luis H. S.
    Intellectual 280 points

    Hi Evan,

    Thanks for the support!! I downloaded the TIDA-010030 reference design. I'm assuming the block diagram with the BQ7718 is incorrect as I don't see them in the schematic and as Luis mentioned, the BQ76952 has built in protection so I don't think I will need that. Are you in agreement?  I will also look into the BQ76200 as this is something new thrown into the mix!

    Thanks again!

    John

  • 0 in reply to John DeCesare
    Intellectual 280 points

    Hi Evan,

    Disregard comment on the BQ7718. I did not see the other schematic page with those devices.  Sorry about that!

    John

  • 0 in reply to John DeCesare
    TI__Mastermind 36640 points

    Hello John,

    No worries about that! Also, the BQ76952 actually has integrated high-side N-FET driver. So a chip like the BQ76200 would not be required Slight smile.

    Yes, if you do not require a separate secondary protection, you would not need the BQ7718.

    Best Regards,

    Luis Hernandez Salomon

  • +1 in reply to Luis H. S.
    Intellectual 280 points

    Luis,

    Thanks to you and Evan on all the help.  Once I finalize the design, is the schematic something you your team would be willing to review?

    John

  • 0 in reply to John DeCesare
    TI__Mastermind 36640 points

    Hello John,

    Yes that's perfectly fine! You would just have to create two threads, one for the BQ76952 and one for the B34Z100 so Evan's team and I can review each component Slight smile.

    Best of luck with your design!

    Best Regards,

    Luis Hernandez Salomon