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CIRCUIT060003

Temperature sensing with PTC thermistor circuit

CIRCUIT060003

Overview

This temperature sensing circuit uses a resistor in series with a positive–temperature–coefficient (PTC) thermistor to form a voltage–divider, which has the effect of producing an output voltage that is linear over temperature. The circuit uses an op amp in a non–inverting configuration with inverting reference to offset and amplify the signal, which helps to utilize the full ADC resolution and increase measurement accuracy.
Features
  • Senses Temperature between 0°C - 50°C 
  • Output: 0.05V - 3.25V 
  • Single 3.3V Supply with half-supply reference
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Technical documentation

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Type Title Date
Circuit design Temperature Sensing PTC Circuit With MSP430 Smart Analog Combo (Rev. C) PDF | HTML Sep 26, 2024
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. D) PDF | HTML Sep 24, 2024
Circuit design Temperature sensing with PTC circuit (Rev. B) PDF | HTML May 19, 2021
Application note How to Use the Smart Analog Combo in MSP430™ MCUs (Rev. A) PDF | HTML Oct 24, 2019
Application brief How to monitor board temperature Jan 28, 2019
Application note Methods to Reduce Thermistor Linearization Error, Memory, and Power Requirements Dec 13, 2018

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