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OPT3101: temperature sensor

mahiro.aikawa
Prodigy 80 points
Part Number: OPT3101
Other Parts Discussed in Thread: TMP102

I have a question about the temperature sensor.

Please tell me the resolution of OPT3101's temperature sensor.
Please tell me about TMAIN and TILLUM respectively.

  • 0
    TI__Genius 9380 points

    mahiro-san,

      TmainC is the actual temperature inside of the OPT3101. it is based on 1degree C resolution and 1degree C accuracy. Because the controller is non floating point there are no digits below the decimal point. Tmain is a calculated tmeperature value to get better resolution and is used in all calculations.

    Tillum is the register for an external temperature sensor. THis register is based on 12 bit resolution and the OPT3101 uses a TMP102 as the sensor,  this providee a hifgher resolution and can monitor the exernal emitter. 

  • 0 in reply to Gordon Varney
    Prodigy 80 points

    It is an additional question.

    I understand that the resolution is 1°C.
    However, when converting Tmain to temperature during measurement, a decimal point may appear. Why is this phenomenon?

    example)

    As an experiment, we increased the temperature and measured it.
    Why do 22.25℃ and 22.5℃ between 22℃ and 23℃ appear in the image below?

  • 0 in reply to mahiro.aikawa
    TI__Genius 9380 points

    mahiro-san,

      It has to do with averaging.

    example: 1+1=2, 2/2=1, 1+1+1=3, 3/2=1.5