lm35 problem

Thread Starter

mah

Joined Mar 15, 2010
393
i use lm35 to measure the temperature surface of photovoltaic panel when i feed it with 2.6 v supply it give output 0.754 this is related to 75 °C when i increased the supply voltage to 4 v and more it give 0.44 v related to 44 °C
Is that normal or i have defected sensor ?
 

praondevou

Joined Jul 9, 2011
2,942
What is the actual temperature?

Line regulation is only specified between 4V and 30V according to the datasheet. At what voltage do you want to use the IC?
 

wayneh

Joined Sep 9, 2010
17,496
Why? You've only cited one result (which is plausible depending on what you are doing with it) taken at the absolute minimum supply voltage. Try 9V and see what you get.

By the way, it's just as easy to wire this wrong as any other component. Mine survived miswiring at 5V but not when I turned up the voltage. Double check before you do that.
 

ErnieM

Joined Apr 24, 2011
8,377
any voltage is available but i have doubts of output
If you remove the supply altogether will you trust the voltage output?

(There's a lower limit if you want reliable operation.)

Ultimately, your validation testing should remove all your doubts.
 
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