Temperature sensing with PTC thermistor circuit CIRCUIT060003 (ACTIVE)
- Temperature Sensing With PTC Circuit (Rev. A)
(PDF 298 KB)
23 May 2019
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