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Original question:

BQ78350-R1: What if the full pack capacity is larger than the maximum value programmable for design capacity?

BQ78350-R1: Specific cell is not available in list of chemistry IDs. How do I pick a substitute?

Greg Decker
Prodigy 225 points
Part Number: BQ78350-R1
Other Parts Discussed in Thread: GPCCHEM, GPCCEDV

If the cell I'm using isn't included in the list of chem ID numbers, can I pick a substitute, or do I have to execute the Mathcad guide and set my CEDV coerfficients manually?

If the latter, I see how to get the values from the calculator and what values to enter into the GG dataflash. What bits do I set to make sure the pack knows it should be looking at the coefficients I set instead of the cell chemistry table?

  • +1
    TI__Guru* 81034 points

    Hi Greg,

    Have you seen this document?: https://www.ti.com/lit/an/slua924/slua924.pdf  The Gas Gauging section has some instructions for using the GPCCHEM tool (to find the closest ChemID match) and it also covers the steps to find your CEDV coefficients using the GPCCEDV tool.

    For this device, the ChemID is only used to estimate the SOC at startup or after a reset. When the battery is active, the CEDV coefficients will be the more important parameters for accurate gauging.

    Best regards,

    Matt