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BQ27531EVM: BQ STUDIO Temperature calibration

user3753091
Prodigy 40 points
Part Number: BQ27531EVM

Hi, I am trying to calibrate the temperature but the process in the software dont change de value I read.

Furthermore, I dont understand what does the parameters "Ext a Coef 1, Ext a Coef 2....."Ext type Coef 1, Ext type Coef 2, ..." means and how do I can manually set them. (Data Memory - Calibration)

Thanks for your time.

Regards

Nicolás Petrungaro

  • 0
    TI__Intellectual 1735 points

    • Are you calibrate the external temperature by ntc or the internal temperature?
    • Please make sure that the device is unsealed.
    • You can upload your resister connection of TS pin and I will help to calculate the coeff for you. 

  • 0 in reply to answer
    Prodigy 40 points

    I am doing the following process.

    I connect the device, I send the unsealed command and the unseal full access comand.

    Then I read all (some times when I read, the values apear in red, i don't know what this means). 

    After reading all, i go to the Calibration window and make the calibration process as it says on page 19 of the bq27531EVM manual. The fact is that the value I read doesnt change at all, neither for the internal or external temperature.

    I am really lost with this thing, if you can give me some help i would appreciate.

    Thanks for your time,

    Nicolás.

  • 0 in reply to user3753091
    Prodigy 40 points

    Hi, is there any answer for the issues above?

    Related to the temperature coefficient, the NTC thermistor I've got in my battery is descript in the Data Sheet I attached. Would you calculate de coefficients for me with that information?

    Thanks a lot for your time,

    Nicolás.PCM C200 NTC 10K_B3435K.pdf