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Production with bq4050 gauge

Other Parts Discussed in Thread: BQ4050, BQ34Z100, BQ78Z100, GPCCEDV, BQ2040, BQ2060

I am considering the bq4050 for a 2S design that only needs LED outputs so no I2C communications or high accuracy will be needed.  Since this gauge is CEDV, does that mean that each production pack will need a qualified LEARN cycle?  Or will simply loading a golden file and calibrating each pack be sufficient?

If such a pack would require a LEARN cycle and we wish to avoid it, what would be the next best alternative (trying to keep the design as simple and low cost as possible)?  I considered the bq34z100 or bq78z100 but would like to use an integrated protector so I can shut off the FETs when the battery is removed from the Host or charger using a Presence pin.

  • You can use the GPCCEDV tool to find the CEDV coefficients to use in the golden file. You will also need to run a full cycle to update FCC in the golden file. That file can be used to program new packs in production and a new learning cycle is not needed. FCC will get updated as the pack is used in the field.

  • Thank you Tom. A full cycle for the golden file was expected, but not having to cycle for production is a great improvement over the older devices we still use, like bq2040 and bq2060.