Temperature sensing with NTC thermistor circuit
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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.

  • Senses Temperature between 25°C - 50°C 
  • Output: 0.05V - 3.25V 
  • Single 3.3V Supply with half-supply reference

Technical Documents
Application notes (6)
Title Type Size (KB) Date
PDF 440 24 Oct 2019
PDF 356 18 Oct 2019
PDF 263 12 Mar 2019
PDF 1620 28 Jan 2019
PDF 297 30 Dec 2018
PDF 286 13 Dec 2018
User guides (1)
Title Type Size (KB) Date
PDF 23214 08 Jul 2016
Solution guides (1)
Title Type Size (KB) Date
PDF 11259 18 Feb 2019

Software (1)

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 (5)

Part Number Name Product Family
MSP430FR2311  16 MHz Ultra-Low-Power Microcontroller - 4 KB FRAM, 1 KB SRAM, 16 IO, 8ch 10-bit ADC, OpAmp, TIA  Microcontrollers (MCU) 
MSP430FR2353  24MHz 105C ULP Microcontroller With 16 KB FRAM, 2 KB SRAM, 44 IO, 12-bit ADC, 12-bit DACs, OpAmp/PGA  Microcontrollers (MCU) 
MSP430FR2355  24MHz 105C ULP Microcontroller With 32 KB FRAM, 4 KB SRAM, 44 IO, 12-bit ADC, 12-bit DACs, OpAmp/PGA  Microcontrollers (MCU) 
OPA333  1.8-V, 17-µA, microPower, precision, zero-drift CMOS op amp  Operational amplifiers (op amps) 
TLV9002  2-Channel, 1MHz, RRIO, 1.8V to 5.5V Operational Amplifier for Cost-Optimized Systems  Operational amplifiers (op amps) 

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