Hi all,
I observed a strange measurement with the LM95071.
First some words about me and my project.
My name is Rainer Balzerowski and I'm from Hamburg, Germany.
For a private project I want to find out the characteristic curve of a (very cheap) NTC Element.
So I build a simple test where I put the NTC together with the LM95071 in cooking oil and freezed it to -18°C.
Then I continuously warmed it using the smallest flame of my gas stove.
Then I compared the measured temperature of the LM95071 with the NTC result.
(The NTC is connected to the ADC of the micro-controller using a voltage divider circuit.)
What I found is that the readings of the TI LM95071 are not continuously rising (falling).
While heating the oil the temperature goes down at approx. 60°C and 115°C.
It rises while the oil cools down at the same temperatures.
In the diagram below the white line is the temperature read from the LM95071 (right scale in °C). The red line is the ADC Measurement of the NTC (0-1023 digits - 10bit ADC)
Is this typical for the LM95071, or am I missing something?
Any help will be greatly appreciated.
Best regards, Rainer Balzerowski
