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Original question:

RM57L843: OTP Temperature Sensor Calibration Values

RM57L843: TMS570LC4357 and RM57L843 On-Chip Temperature Sensor Measurements

Bilal
Intellectual 320 points
Part Number: RM57L843

Dear TI,

Hope you are fine. I am working on onboard chip temperature sensors.The document mentioned above have a code bug in the attached picture which results in wrong junction temperature measurement.The code used in the above document gives worng temperature values in kelvin.By correcting the code it will give the correct callibration values in OTP as well as in kelvin.Please find the attached documents.

With Regards,

Bilal Zahoor Ahmed.

  • 0
    TI__Mastermind 21425 points

    Hello,

    Please, check what is your reference voltage. On LaunchPad it is defined by R2, R3 and R4. On HDK J8 defines the reference voltage. At my desk the code is working fine and I don't believe the code in thermistor_calibration is wrong but I'll forward this thread to our ADC expert.

  • 0 in reply to Miro
    Intellectual 320 points

    Hi,

    Yes reference voltage is set to 3.3V.I am not saying that code is wrong.I only point out the code line in application note.

    With Regards,

    Bilal

  • 0 in reply to Bilal
    Intellectual 320 points

    Hi,

    May be I am wrong but writing similar line i.e sumtempxconv += cal_temperature_array[i] * cal_adc_code_array[i]; in code gives kelvin values lesser than 273 which results in negative temperature in Celsius.

    With regards,

    Bilal

  • 0 in reply to Bilal
    Intellectual 320 points

    Dear TI,

    Temperature sensor on board code is working fine.The problem is on my end.The refernce voltage is set to 5v.I have changed it to 3.3v  by shorting j8 point.Please find the attached  picture.

    Thanks and Best Regards,

    Bilal Zahoor Ahmed.