Hello, I am currently working on a project that uses a thermistor to read temperature values. I've set up a voltage divider as shown on the attached circuit. I'm reading the output voltage at an ADC input pin on an AVR and doing math in software to print the temperature to an LCD.
The issue I am having is that the temperature starts off at around 70F(room temp. as expected) but then continues to increase to around 85F until it holds there. The thermistor is an SMD 0805 type package, and is located on an area of the circuit board that is not near any other components (so I think I can rule out heat output from adjacent devices).
I'm thinking the thermistor itself is dissipating electrical power in the form of heat causing the thermistor temperature to change. Is this possible?
Here is a link the the thermistor datasheet: http://www.murata.com/products/c... See part No. NCP21XV103J03RA
Any circuit alterations anyone can think of that would yield more accurate temperature reading?