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BQ34Z100-G1 Compatibility with SAFTLM26500

Austin Tanner
Expert 8255 points
Other Parts Discussed in Thread: BQ34Z100-G1, GPCCHEM, BQ34Z100

Hello,

I would like to use the BQ34Z100-G1 gas gauge with a primary cell SAFT LM26500 to be exact and was wondering what I would need to do to accomplish this.

  • 0
    TI__Guru 73830 points
    Austin,
    You will need a ChemID match to use the bq34z100-G1 with the cell. You can collected log data and use the GPCCHEM tool to try to find a match. There are instructions as to how to collect the data on the website. How may series cells are you using? The stack voltage must be at least 3.5V.

    www.ti.com/.../GPCCHEM

    Tom
  • 0 in reply to ThomasCosby
    TI__Expert 8255 points

    It will be an 11S stack so voltage will range from 35.2V down to 22V so that should not be an issue.

     

    We have used the Bq34z100 on other projects and one issue we came across was if the batteries were to sit for a period of time they would lose their SOC. Has this been fixed? Currently cycling the battery is the only thing that fixes this issue. The other questions that come to mind are has the calibration procedure changed? And does the alert pin function completely? The errata of the BQ34Z100 cut out a lot of functionality.

     

    I appreciate all of the help thank you.

  • 0 in reply to Austin Tanner
    TI__Guru 73830 points

    Austin

    There were a lot of improvements added to the bq34z100-G1. The IT gauges will adjust the SOC as the pack rests and the voltage changes. The -G1 device does offer the option of preventing the change during rest, but the gauge will adjust the capacity when it leaves the relaxation state. The calibration process is the same and the ALERT functionality was fixed.

    Tom