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CCS/TMS320F28035: How to make a good calibration when the TMS320F28035 ADC temperature Sensor output is unstable?

Evan Lin
Prodigy 150 points
Part Number: TMS320F28035


Tool/software: Code Composer Studio

Dear Sir or Lady,

     When the temperature of the DSP F28035 is geting higher, how should I make a calibration since there is a great change in  DSP ADC temperature sensor output?

  • 0
    TI__Guru 62975 points
    Evan,

    Can you elaborate on your query? What are you trying to calibrate? Is it the temperature-compensated oscillator trim or something else? What do you mean by unstable?

    -Tommy
  • 0 in reply to tlee
    Prodigy 150 points

    Tommy,

          When the bit TEMPCONV is enable and set to 1, enabled internally connects the internal temperature sensor to ADC
    channel A5 and disconnects the ADCINA5 pin from the ADC. Whether the pin ADCINA5 exists on the
    device does not affect this function. Any external circuitry on the ADCINA5 pin is uneffected by this
    mode.

           The  internal temperature sensor was used to calibrate the ADC, but the temperature sensor itself will output diferently from normal temperature and high temperature, should I do something more about this temperature sensor output unstably?

  • 0 in reply to Evan Lin
    TI__Guru 62975 points

    Evan,

    The temperature sensor is primarily used for trimming the internal oscillators as shown in the osc_comp example.  As you have stated, the output voltage will vary with temperature.

    Are the ADC trims from Device_cal() not sufficient for your needs?

    -Tommy