Temperature | Output Voltage | Supply | |||
---|---|---|---|---|---|
TMin | TMax | VoutMin | VoutMax | Vdd | Vee |
25°C | 50°C | 0.05 V | 3.25 V | 3.3 V | 0 V |
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.
Solve for the parallel combination of R2 and R3 using the ideal gain. Select R4= 1.5 kΩ (Standard Value).
Calculate R2 and R3 based off of the transfer function and gain.