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best gas gauge for LiMNO2

Timothy Starr
Expert 2445 points
Other Parts Discussed in Thread: BQ34Z100, BQ34Z110

Hello-

We are looking for a fuel gauge to monitor 2 or 6 primary cells in series of LiMNO2 chemestry. What is the best fuel guage from TI to use? We need to be able to replace the CR123 batteries and still get accurate state of charge, and drive LED indicators directly. Thanks and Best Regards,

-Tim Starr on behalf of MD@BA

  • 0
    TI__Guru* 76230 points

    Timothy,

    We do not currently have a gauge that can support LiMNO2 accurately. We are working on a new algorithm to support this chemistry, but it will not be available until late 2013. It will be developed on the bq34z100 platform.

    Best regards

    Tom Cosby

  • 0 in reply to Onyx Ahiakwo
    Prodigy 10 points

    Tom,

    Would it not be possible to use the simple discharge test to characterize the CR123 cells using the mathcad worksheet and generate a chem_id in that fashion.  Since the cells are not rechargeable, would it be possible to initiate a hard or soft reset to reinitialize the device back to the original full charge capacity values.  It's hard to determine from the wording in the datasheet what would happen during a reset in both sealed and unsealed modes.  The datasheet also makes mention of a /MRST pin which doesn't show up in the pin list. 

    Any thoughts on this approach?

    Mark Devins

  • 0 in reply to Onyx Ahiakwo
    Expert 2445 points

    Hi Tom-

    Thanks that's helpful. Could you please also tell us:

    1)      Are the BQ34Z100 and the BQ34Z110 drop in replacements for each other?

    2)      What is the difference between the BQ34Z100 and the BQ34Z110?

    3)      Which is better for LiMNO2 application (this may be moot point given your last post)?

    4)      What is meant by system versus pack side in the parametric table?

    5)      Is there any need to reset the gas gauge when the primary cell is replaced?