CIRCUIT060002

Temperature sensing with NTC thermistor circuit

CIRCUIT060002

Overview

This temperature sensing circuit uses a resistor in series with a negative–temperature–coefficient (NTC) 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 gain the signal, which helps to utilize the full ADC resolution and increase measurement accuracy.
Features
  • Senses Temperature between 25°C - 50°C 
  • Output: 0.05V - 3.25V 
  • Single 3.3V Supply with half-supply reference
General-purpose op amps
TLV9002 Dual, 5.5-V, 1-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)
OPA333 Micropower, 1.8-V, 17-µA zero-drift CMOS precision operational amplifier
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Technical documentation

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Type Title Date
* Circuit design Temperature sensing with NTC circuit (Rev. A) PDF | HTML 03 Jun 2021
* Circuit design Temperature Sensing NTC Circuit With MSP430 Smart Analog Combo (Rev. C) PDF | HTML 09 Mar 2020
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. C) 18 Dec 2023
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
Circuit design Monitoring NTC Thermistor Circuit With Single-Ended ADC (Rev. A) PDF | HTML 27 Jun 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
User guide Single-Supply Thermocouple with RTD Base Cold-Junction Compensation Design Guide 08 Jul 2016

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