This document shows how to select a temperature sensor and conditioning circuit to maximize the measurement accuracy and simplify the interface to the MCU. Practical circuits and interface techniques will be provided for embedded applications with thermocouples, thermistors, Resistive Temperature Detectors and silicon integrated circuit temperature sensors. The attributes of each temperature sensor and the advantages of analog, ramp rate, duty cycle, frequency, serial and logic output solutions will be discussed. An analog output thermocouple circuit will be compared with a frequency output RTD oscillator circuit, along with design examples using serial and analog output silicon Integrated Circuit (IC) sensors. In addition, a Programmable Gain Amplifier (PGA) circuit will be shown that can increase the effectiveness of the analog-to-digital converter (ADC) bit resolution of a non-linear thermistor sensor.
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Temperature Measurement Circuits for Embedded Applications
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