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RTD( Resistance temperature detectors ) circuitry with micro controller ADC

DevIndia Infoway
Prodigy 90 points
Other Parts Discussed in Thread: LMP90080

The range of temperature I want to measure is from 00 C to 1500 C.

1) I want to measure temperature with PT-100 3 wire RTD ( Resistance temperature detectors ) so I need the circuitry for the excitation current being provided to the RTD( having 3 wire = 1red & 2 white ) 

Having 12 bit ADC inbuilt in the micro controller also I wanted to know that do I  need to change the reference voltage for the ADC ?

2) I need maximum possible accuracy with the PT-100 3 wire RTD so please provide me the circuitry accordingly & the steps I need to keep in mind while taking temperature reading.

3) I want to know that can I connect any one wire( white ) of the RTD which are internally short to the ADC port pin of the micro controller for the temperature measurement.

  • 0
    Intellectual 720 points

    Hi DevIndia,

    As per my previous experience with temp sensors, I suggest you go with LMP90080 which is a all in one solution from TI also known as sensor AFE. It contains current exciter along with ADC and single chip solution at low cost. Again I you go with discrete units like ADC, current supply unit to excite RTD, it becomes a bulky solution with large no of SOC's.

    Thanks and Regards

    -Anand