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BQ76952: BQ76952

John DeCesare
Intellectual 310 points
Part Number: BQ76952
Other Parts Discussed in Thread: BQ34Z100

Hi,

I have three questions regarding the BQ76952.

  1. The system needs to support stacks of 4, 7 10 and 14 cells. I would like to use VC0-VC3, VC16 for the 4 cells, VC0-VC6,VC16 for the 7 cells, VC0-VC9, VC16 for the 10 cells and VC0-VC13,VC16 for the 14 cells.  How do I configure the unused VCx pins? For example, for the 4 cell setup, do I simply short VC16 to VC15 to VC14 and so on to VC3?

In my design, I'm also using the BQ34Z100 for a gas gauge.

  1. If we are only using one NTC to monitor battery temp, would you recommend using the temperature monitor of the BQ76952 or the BQ34Z100PWR-R2?

Last question. Will TI review my schematic when complete?

Thanks!

John

  • 0
    TI__Mastermind 42060 points

    Hello John,

    Besides the requirement for top cell and bottom two cells, you can use any short order for the cells in between. I think the following E2E will be useful for you:

    On the temperature, it depends on why you want to use the temperature sensor. I would definitely recommend to have a temperature sensor for the gauge, since I believe the impedance track gauging algorithm takes temperature into account for its gauging. For the BQ76952, you can have up-to 9 NTC thermistors connected, and these all could report a temperature, or can be used to trigger protections depending on what the temperature is. 

    Yes of course, we can review your schematic Slight smile. Once you need us to review it, open a new E2E and then we will request you to send it to us on private messages in E2E (If you would not like to post it publicly).

    Best Regards,

    Luis Hernandez Salomon

  • 0 in reply to Luis H. S.
    Intellectual 310 points

    Hey Luis,

    Good to hear from you. Thanks for the pointer to the cells. Clears things up!  And I'll use the temp for the gauge as well.

    Thanks!

    John