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Original question:

BQ40Z80: GPCRA0 calculator using scaled current or actual current?

BQ40Z80: Current scaling BUG workaround instructions

grandaphi
Prodigy 70 points
Part Number: BQ40Z80
Other Parts Discussed in Thread: BQSTUDIO

Hi could I please get detailed instructions for the current scaling bug work around? I have been waiting for updated firmware to resolve the issue but with no solution in 10 months and no indication of a firmware release date, it would be good to get a bit more info on what to do. 

For example this post says to calibrate 50A as 25A and adjust all capacities by a factor of 2:

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/946102/bq40z80-bq40z80-current-scaling?tisearch=e2e-sitesearch&keymatch=bq40z80%20current%20scaling# 

Could you at least specify all of the parameters which need to be adjusted by a factor of 2?

Do all the current protections and smart charge algorithm current values etc also need to be adjusted?

Should current scaling factor still be used in conjunction with this work around?

  • 0
    TI__Genius 11535 points

    Hi grandaphi,

    You should configure the gauge entirely as the reduced capacity value. This will include all protection currents, design capacity, Qmax, etc, Then use the BQStudio calibration plug-in to "trick" the device by putting in 1/2 (or whatever scale you use) of the current that is actually applied.

    Best,

    Jessica

  • 0 in reply to Jessica H.
    Prodigy 70 points

    Thank you Jessica. 

    So what you're saying is I will need to update all values in the data memory that are related to current or capacity?

    Isn't QMAX updated by the device?

    I have already conducted a learning cycle. Will I need to redo it with the "tricked device"? 

    Cheers

  • 0 in reply to grandaphi
    TI__Genius 11535 points

    Hi grandaphi,

    So what you're saying is I will need to update all values in the data memory that are related to current or capacity?

    >>Yes

    Isn't QMAX updated by the device?

    >>Qmax is updated by the device but you will need to modify the Qmax initial values.

    I have already conducted a learning cycle. Will I need to redo it with the "tricked device"? 

    >>Yes, you will need to redo the learning cycle

    Best,

    Jessica