Temperature sensing with PTC thermistor circuit CIRCUIT060003 (ACTIVE)

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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.

  • Senses Temperature between 0°C - 50°C 
  • Output: 0.05V - 3.25V 
  • Single 3.3V Supply with half-supply reference

Technical Documents
Application notes (3)
Title Type Size (KB) Date
PDF 298 23 May 2019
PDF 1620 28 Jan 2019
PDF 286 13 Dec 2018
User guides (1)
Title Type Size (KB) Date
PDF 667 15 Dec 2015
Solution guides (1)
Title Type Size (KB) Date
PDF 11259 18 Feb 2019

Development Tools (2)

Name Part Number Tool Type
Analog engineer's calculator  ANALOG-ENGINEER-CALC  Calculation Tools 
SPICE-based analog simulation program  TINA-TI  Circuit Design & Simulation 

TI Devices (3)

Part Number Name Product Family
LPV821  650nA, Precision Zero-Drift Nanopower Amplifier  Operational amplifiers (op amps) 
OPA375  OPAx375, 500uV, 10-MHz, Low Broadband Noise, RRO, Operational Amplifier  Operational amplifiers (op amps) 
TLV9061  World's Smallest Amp 10MHz, RRIO, 1.8V-5.5V op-amp delivers high performance for challenging systems  Operational amplifiers (op amps) 

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