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Original question:

BQ40Z50-R2: FCC drop to 0 when charging after low temperature

BQ40Z50-R2: BQ40Z50-R2: FCC drop to 0 when charging after low temperature

Emilien Chappatte
Intellectual 355 points
Part Number: BQ40Z50-R2
Other Parts Discussed in Thread: BQ40Z50, GPCCHEM

Hello,

I would like to add information about (but now its locked - I'm late)

This issue was setting charging current too high, way higher than what the BQ40Z50 requested. It was a software issue, as the BMON is not setting the Smart Charger directly.

I don't know if someone could re-open the old thread or add this post to it, but I think its interesting to know the root cause. Even if this is a bit strange to be able to "break" the gauging this way.

Thanks for help Steven and other !

  • 0
    TI__Mastermind 24870 points

    Hello Emilien,

    Can you check the JEITA settings and the charge settings. The bq40z50 does not influence the charging current.

    However, for the drop, make sure you have a proper GPCCHEM match ID as the first step.

    Make sure to successfully run a learning cycle.

    Once that's done, repeat the same at the low temperature. I do encourage you to look at the charge capacity you get out of the battery as the drop to 0% may be normal if the temperature is extremely low.