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LMP90100

rameshwar kumbhar
Prodigy 120 points

If I use Topology #2 as shown in the datasheet of lmp 90100 then how to calculate temperature from the ADC OUTPUT CODE?

  • 0
    TI__Genius 16890 points

    Hi,

    Once you have the ADC reading for CH0 and CH1 as shown in equation 4 on page 51 of the datasheet you can use the ADC formula on page 50 to determine VIN for both channels.  Then subtract Vch0 - Vch1 to get the differential voltage, divide this by the value of IB1.  This gives you the resistance of the RTD.  You then use the lookup table for the RTD to determine the temperature.

    Mike