9/25/2014 Sensor circuit design

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Sensor circuits

Sensor circuits

Temperature measurement using thermistor and an ADC

The thermistor is used to detect the change in temperature. There are two types of thermistor, Positive TemperatureCoeffecient (PTC) and Negative Temperature Coeffecient (NTC). In PTC type,the resistance increase withtemperature and in NTC type, the resistance decrease with temperature. Change in resistance can be converted intoelectric signal and this analog signal can be converter into digital output using Analog to Digital Converter (ADC).

The conceptual circuit diagram is as shown below

Circuit Diagram (Schematic Diagram)-1

Use these equations to design your circuitry by selecting thermistor and ADC from any of these vendors given farbelow

N = ADC resolutionb0, b1, and b3 are the temperature coefficients of thermistor.

This is one of the fundamental concept, there are many new innovative idea from the vendors below. Please refertheir websitesADC vendorsMAXIM www.maxim-ic.comAnalog Device www.analog.comNational Semiconductor www.national.comTexas Instruments www.ti.comThermistor vendorsAdSem, Inc. www.adsem.comEPCOS www.epcos.comNichicon USA www.nichicon-us.comNIC Components www.niccomp.com

Selected list of sensor related analog circuits from multiple vendors.

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