NTC Temperature Divider Sensor

Application

Use this divider as a microcontroller ADC temperature-sense front end.

Design Context

A fixed resistor pulls the sense node toward 5 V while the NTC thermistor pulls it toward ground.

Expected Behavior

The table updates to the steady-state operating point as temperature changes. Raising temperature lowers NTC resistance and moves Vtemp.

Key Values

• V1 is 5 V.
• R1 is 10 k.
• TH1 is a 10 k NTC at 25 C.

Suggested Experiments

• Change temperature from 0 C to 85 C.
• Change R1 to center the useful voltage range.
• Switch between NTC and PTC curve behavior.

Featured Component

The thermistor component computes resistance from temperature and Beta parameters.