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BQ27Z561: bq27z561 and bq35100 floating point conversion the same?

craig
Intellectual 510 points
Part Number: BQ27Z561
Other Parts Discussed in Thread: BQ35100, , , BQSTUDIO

Tool/software:

Hello,

Working with bq35100 and bq27z561-R2 devices. Currenlty doing current calibration... Previously, I successfully perform a calibration utilziing the bq35100 device. In that manual a floating point conversion algorithm is specified. Is this required-for/will-it-work-with the bq27z561 device. Currently doing the current calibration and NOT using the floating point conversion for that device and failing to successful calibrate the device...

  • 0
    TI__Mastermind 25021 points

    Hello Craig, 

    The process for calibrating the current for the bq27Z561-R2 can be found in the gauge TRM. Additionally, if you are using an EVM, you can refer to the bq27z558EVM User's Guide for the current calibration (this is for a different gauge but the EVMs are similar and this process can be followed for the bq27Z561-R2). 

    Regards, 

    Jonny. 

  • 0 in reply to Jonny
    Intellectual 510 points

    This doesn't answer the question Jonny. bq35100 requires a special conversino method. Does the the bq27z561 require the same method?

    I can't just cast from float to ti's format. At least that's what it looks like.

    -Craig

  • 0 in reply to craig
    TI__Mastermind 25021 points

    Hello Craig, 

    I was suggesting to use bqStudio because you do not need to do any conversion, this is handled within bqStudio. You can calibrate one gauge using bqStudio, then read back the calibration parameters from the gauge, then program these values onto another gauge manually. 

    Regards, 

    Jonny. 

  • 0 in reply to Jonny
    Intellectual 510 points

    Are you certain, Jonny? I thought had to calibrate everyboard due to difference in individual gauges?

  • 0 in reply to craig
    TI__Mastermind 25021 points

    Hello Craig, 

    You are correct, but you can calibrate several devices then take the average of the calibrated values, plug these averaged values into a gauge using bqStudio, then you can read out the hex value reported by bqStudio and program this averaged value onto other gauges. 

    Regards, 

    Jonny. 

  • 0 in reply to Jonny
    Intellectual 510 points

    Current design does not allow access to the board via bqstudio. I've written an application to interface manually via the onboard microcontroller. Hence I asked how format float manually.


    Whats your thoughts on calibrating on the dev kit and then just running with that calibration data (I can calibrate voltage and temp fine, current is giving me issues).

    What's the formatting? is it the same as bq35100 float?

  • 0 in reply to craig
    TI__Mastermind 37761 points

    Hello Craig,

    Jonny and I are currently still looking into this. We will get back to you soon.

    Regards,

    Nick