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ARivero
Associate II
September 21, 2024
Solved

Equation error LMx35 (LM135, LM235, LM335) Temperature sensor

  • September 21, 2024
  • 1 reply
  • 983 views

Hi everyone,

Looking at the Datasheet (DS) of the temperature sensor LMx35, I found that the equation on page 6  is wrong, in the sense that the subindex and '=' symbol are missplaced, and there is no reference of what does each symbol means.

https://www.st.com/en/mems-and-sensors/lm235.html#documentation

 

I'm pointing this out since I wanted to use this DS with students.

The right formula can be found in another DS from another manufacturer

Hope this can be corrected soon in the update of the sensor DS

 

Thanks

Best answer by Andrew Neil

You mean this?

AndrewNeil_0-1726907805217.png

 

Indeed, looking at another manufacturer's equivalent:

AndrewNeil_2-1726907961396.png

 

So:

  • VOUTT is the output voltage at temperature T;
  • VOUTTo is the output voltage at the reference temperature, To

 

EDIT:

Sorry, the forum doesn't seem to cope with all that subscripting.

It should look like this:

AndrewNeil_3-1726908513512.png

 

1 reply

Andrew Neil
Andrew NeilBest answer
Super User
September 21, 2024

You mean this?

AndrewNeil_0-1726907805217.png

 

Indeed, looking at another manufacturer's equivalent:

AndrewNeil_2-1726907961396.png

 

So:

  • VOUTT is the output voltage at temperature T;
  • VOUTTo is the output voltage at the reference temperature, To

 

EDIT:

Sorry, the forum doesn't seem to cope with all that subscripting.

It should look like this:

AndrewNeil_3-1726908513512.png

 

A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
ARivero
ARiveroAuthor
Associate II
September 23, 2024

Yeah, correct, exactly that!

many thanks