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
General-purpose op amps
OPA375 OPAx375, 500uV, 10-MHz, Low Broadband Noise, RRO, Operational Amplifier TLV9061 Industry's smallest 10MHz, RRIO, 1.8V-5.5V operational amplifier
MSP430 microcontrollers
MSP430FR2310 16 MHz integrated analog microcontroller with 2 KB FRAM, OpAmp, TIA, comparator with DAC, 10-bit ADC MSP430FR2311 16-MHz integrated analog microcontroller with 3.75-KB FRAM, OpAmp, TIA, comparator w/ DAC, 10-bit AD MSP430FR2353 24 MHz 105 C integrated analog microcontroller with 16 KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD MSP430FR2355 24-MHz 105-C integrated analog microcontroller with 32-KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD
Precision op amps (Vos<1mV)
LPV821 650nA, Precision Zero-Drift Nanopower Amplifier

Technical documentation

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Type Title Date
* Application note Temperature Sensing PTC Circuit With MSP430 Smart Analog Combo (Rev. B) Mar. 06, 2020
* Application note Temperature sensing with PTC circuit (Rev. A) May 23, 2019
Application note How to Use the Smart Analog Combo in MSP430™ MCUs (Rev. A) Oct. 24, 2019
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. A) Feb. 18, 2019
Application note How to monitor board temperature Jan. 28, 2019
Application note Methods to Reduce Thermistor Linearization Error, Memory, and Power Requirements Dec. 13, 2018
User guide TIDA-00641 Test Results Dec. 15, 2015

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