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FAQ: What is the equation for calculating Internal Temperature Sensor for AD7124-4/AD7124-8 in unipolar mode?

FAQ: What is the equation for calculating Internal Temperature Sensor for AD7124-4/AD7124-8 in unipolar mode?

For AD7124-4/AD7124-8 the sensitivity of the internal temperature sensor is 13,584 codes/°C, approximately when Vref = 2.5V. Both unipolar and bipolar coding can be used when reading the internal temperature sensor.

The formula to convert the ADC output code to a temperature when operating in unipolar mode is:

Temp (°C) = (Conversion / (2*13,584)) – 272.5

Example:

ADC is configured in unipolar. The output code of the AD7124 internal temp sensor at ambient temperature is 8082480 this code to a temperature is done as follows

Temp (°C) = (Conversion / (2*13,584)) – 272.5

Substitute Conversion = 8082480,

Temp (°C) = (8082480/ (2*13,584)) – 272.5 = 25°C

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