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BQ78350-R2-DEVICE-FW: Use in a cold environment

Nicolas OTAL1
Prodigy 20 points

Part Number: BQ78350-R2-DEVICE-FW

Hello, we are currently looking to optimize the use of the BQ78350-R2 in a cold environment. I found that we could use the TC parameter in Fuel gauging > CEDV cfg > TC.

"TC adjuststhe variationof impedancefor cold temperaturesT < TC is programmedinEDVTC Factor."

Our Bq gives a less good estimation of the battery at temperatures close to zero and we want to compensate for this use in the middle. However, we are not sure that we should change only this parameter. Do you think this is the only parameter to change? And it is not described in which unit is TC? What exactly is TC?

Best regards,

  • 0
    TI__Guru* 81034 points

    Hi Nicolas,

    This is a key parameter for adjusting the slope over temperature, but I do not have any experience modifying only this parameter outside of the GPCCEDV tool (which calculates all of the CEDV coefficients based on 6 log files - 3 temperatures and 2 loads). 

    Since the algorithm for the CEDV compensation is not public, I cannot share the math behind the calculations unfortunately. Maybe the best way is to collect logs at 3 colder temperatures to see how the GPCCEDV tool changes the TC parameter.

    Best regards,

    Matt