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BQ34Z100-G1: Golden Image without the need for a learning cycle

Sebastian M
Intellectual 720 points
Part Number: BQ34Z100-G1


Hi,

we are using two 12V lead acid batteries in series (YUASA NP7-12).

The gas gauging already works very well and we want to create a golden image.

We need a very simple bring up procedure for the production.

So my question is: Can we skip the learning phase during production if all parameters are ok and work well?

Can i just set the UpdateStatus value to 6 (or another value)?

Is there something else we must set?

It is absolutely ok for us if the gas gauging is not 100% precise. It is more important that the bring up is really simple.

Regards,

Sebastian

  • 0
    Intellectual 720 points
    Hmm, maybe i misunderstood the bring up procedure of the gas gauge. I have read different things about it and am not sure how it works with the BQ34Z100-G1.
    So i have run an optimization cycle and calculated the RaTable. Everything is set up as it should and the gauge is calibrated. I create a Golden Image from this gauge with UpdateStatus (LearnedStatus) set to 02.
    Now i have a new board with a "blank" gauge. Are these steps correct:
    -write Golden Image to gas gauge (this sets ChemID, RaTable, configuration, default calibration)
    -calibrate voltage, current, temperature if needed
    -enable IT
    -Gas Gauge is ready for the field

    So if i have evaluated a good default calibration i can enable IT already in the Golden Image and program it.
  • 0 in reply to Sebastian M
    TI__Expert 5230 points
    Hi Sebastian, sorry that many of our team are OOO for the holidays, they will be back Jan 3 and be catching up.

    Thanks,

    Terry
  • 0 in reply to -Terry
    TI__Guru 73830 points
    Sebastian,
    The four steps that you listed are correct. I also recommend Sealing the flash after sending the IT Enable command. You do not have to run a learning cycle in production, but the accuracy may be degraded until Qmax and the Ra table have updated in the field.
    Tom
  • 0 in reply to ThomasCosby
    Intellectual 720 points
    Ok, sealing the flash is a good idea, i will add it to my procedure.
    If i have determined a good default (average) value for the calibration is it then possible to make a golden image were the IT is already enabled (and the flash sealed). So the only thing i need to do after production would be to program the golden image into the gas gauge?
    Sebastian
  • 0 in reply to Sebastian M
    TI__Mastermind 34775 points

    Hi Sebastian,

    Yes, since no calibration will be done in production. I take it you meant "assembly" above where you mentioned "production" because programming the flash with the golden image is part of the battery pack production process.