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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
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
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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. C) 18 Dec 2023
Application note How to Use the Smart Analog Combo in MSP430™ MCUs (Rev. A) PDF | HTML 24 Oct 2019
Application brief How to monitor board temperature 28 Jan 2019
Application note Methods to Reduce Thermistor Linearization Error, Memory, and Power Requirements 13 Dec 2018

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