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 Single, 5.5-V, 10-MHz, RRIO operational amplifier for cost-optimized applications
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 ADC 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
* Circuit design Temperature sensing with PTC circuit (Rev. B) PDF | HTML 19 May 2021
* Circuit design Temperature Sensing PTC Circuit With MSP430 Smart Analog Combo (Rev. B) PDF | HTML 06 Mar 2020
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. B) 05 Oct 2022
Application note How to Use the Smart Analog Combo in MSP430™ MCUs (Rev. A) PDF | HTML 24 Oct 2019
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. A) 18 Feb 2019
Application note How to monitor board temperature 28 Jan 2019
Application note Methods to Reduce Thermistor Linearization Error, Memory, and Power Requirements 13 Dec 2018
Test report TIDA-00641 Test Results 15 Dec 2015

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