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Original question:

TMS320F28027F: Internal temperature sensor reading more

TMS320F28027F: Internal temperature sensor reading more

msadegh agha
Expert 1830 points

Part Number: TMS320F28027F

hi,

i am using tms320f28027f and try to work with internal temperature sensor.

i read a application notes and datasheets and import the formula from C:\ti\controlSUITE\device_support\f2802x\v230\f2802x_examples_structs\adc_temp_sensor_conv to my projects.

but i have a problem with formules.

the results have a big offsets. i think the result multiple by 2 or something like that.

anybody can help?

thanks

  • 0
    Expert 1830 points
    the function is:

    int16_t ADC_getTemperatureC(int16_t sensorSample)
    {
    return ((sensorSample - ADC_getTempOffset())*(int32_t)ADC_getTempSlope() + ADC_FP_ROUND + ADC_KELVIN_OFF)/ADC_FP_SCALE - ADC_KELVIN;
    }
  • 0 in reply to msadegh agha
    TI__Guru* 82910 points
    Can you note the value of both the degK and degC variables once the program has ran? I'm assuming you are at "room" temp ~30degC in your lab, if not please let me know.

    This example is typically robust, since the temp sensor connection is self contained and is not subject to external loading from different PCB designs. Can you also share what PCB is being used, i.e. LaunchPad, control card, custom PCB, etc.

    Best,
    Matthew