NTC Voltage Divider Lookuptable

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Coefficient Version
Some manufacturers specify extended steinhart hart coefficients in their datasheets.

Given a voltage divider R1 connected to VCC and a NTC connected to ground. V_aref may be equal to V_CC but may be specified different.

A fast microcontroller might calculate the temperature according to the coefficients in real time. More oftenly, you'll need only few discrete values that can be called from a lookup table more efficiently.

Circuit components

R1[Ω]

Series Resistor SI

R_NTC[Ω]

NTC Resistance SI

A/D res

counts

V_plus

V_aref

The extended Steinhart Hart Formula

Is useful for calculating the resistance of the NTC for a given temperature.

1/T=A₁+B₁*ln(r)+C₁*ln²(r)+D₁*ln³(r)

or for the resistance

R(t)=R₂₅ * exp(A+B/t+C/t²+D/t³)

R₂₅ is the resistance at 25°C.

Single values

Value T(R)

R_NTC

T [°C]

V [V]

A/D [counts]

Value R(T)

T [°C]

R_NTC

V [V]

A/D [counts]

Value T(AD)

A/D [counts]

R_NTC

T [°C]

V [V]

Tables

A/D Step

T from [°C]

T to [°C]

Step

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NTC Voltage Divider Lookuptable

Circuit components

The extended Steinhart Hart Formula

Single values

Tables