Abstract: The paper describes a new smart temperature sensor based on a modified servo A/D converter with a nonlinear ladder reference. The device is designed to be connected with different sensor types for contact temperature measurements. It includes thermal management and protection. The programmability of the smart temperature sensor enables simple calibration of the device by changing parallel digital words. This device which uses the silicon temperature sensor KTY83-110 (Siemens), NTC thermistor and Pt100 temperature dependent resistor is realized and simulated within SPICE software package in different temperature ranges, respectively. The results of simulated measurements were found to be in excellent agreement with the theoretical predictions.
Key words: Temperature sensor, smart sensor, A/D converter, termistor.