TEMPERATURE_SENSOR_AND_DVM_INTERFACE

Published:2009/7/7 2:39:00 Author:May | From:SeekIC

The DVM gives a direct indication of the temperature of the sensor in degrees Centigrade. The temperature sensor IC1 gives a nominal 1 μA per degree Kelvin which is converted to 10 mV per degree Kelvin by R1 and VR1. IC2 is a micropower, low input drift op amp with internal voltage reference and amplifier. The main op amp in IC1 is connected as a voltage follower to buffer the sensor voltage at R1.The second amplifier in IC1 is used to amplify the.2 V internal reference up to 2.73 V in order to offset the 273 degrees below 0℃. The output voltage of the unit is the differential output of the two op amps and is thus equal to 0.01 V per ℃.



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