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How Close Can I Come to JEITA Charging Requirements with the present Bq20z90/95 System?

Michael Banak
Intellectual 915 points
Other Parts Discussed in Thread: BQ20Z90, BQ20Z40

JEITA Charging Requirements came to my attention at a recent Ti Tech Day. I am excited about conforming to this emerging standard.

I can mimic (perhaps even do better than) the JEITA Charge Current limits, byemploying the temperature-based Charge-Current Throttling Utilities in the bq20z90/95.

2.4.7 Fast Charge Temperature Throttling

No Problem there.

But the JEITA Charging Requirements also modulate the Charging Voltage as a function of temperature. I have scrubbed the tecnical reference, and I see no hooks in there for throttling the Charge Voltage vs. temperature.

Might there be a utility in there already for acheiving this?

My apologies if I have missed it in my search. Perhaps a later version of the device firmware will have something along these lines.

Regards,

Michael A. Banak, PE

http://eclectic-engineering.net

  • 0
    TI__Genius 10235 points

    Michael,

    You didn't miss anything in your reading.  The z90/z95 does not have the ability to modulate Charging Voltage as a function of temperature.  However, we do have a device coming that will meet the JEITA specifications (bq20z60/65).  This device is scheduled to release in the coming weeks.  We did recently release a non-LED version, the bq20z40/45, that conforms to the JEITA spec.

     

    Chase