Circuit diagram of NTC thermistor application.Human motion sensing module

　　The following temperature sensing circuit diagram uses a resistor thermistor in series with the Negative temperature coefficient (NTC thermistor) to form a voltage divider and generate a linear output voltage. This circuit uses a non reverse operational amplifier that has a reverse reference to the offset and obtains the signal. This helps to fully utilize ADC resolution and improve measurement accuracy.

　　1. The linear working area adopts an operational amplifier. Linear output fluctuations are typically specified in AOL testing.

　　2. Vin is connected to the positive temperature coefficient of the output voltage. Correct the NTC output voltage and switch the positions of R1 and NTC thermistors.

　　3. R1 is selected based on temperature range and NTC value.

　　4. Vref can be created using DAC or voltage divider. If a voltage divider is used, the voltage of the equivalent resistance voltage divider will affect the gain of the circuit.

　　5. High value resistance reduces the Phase margin of amplifier and capacitor circuits and introduces additional noise. It is recommended to use a resistance value of approximately 10k Ω or less.

　　6. Placing it in parallel with the capacitor to limit bandwidth, improve stability, and provide feedback resistance to help reduce noise.

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