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LM35: LM35

James Brothen
Prodigy 10 points
Part Number: LM35

Tool/software:

We are applying 5V to the sensor and taking a reading at room temperature. We have one part that is not consistent with the others. The reading that we are expecting in in the 0.221 to 0.223 range. We have one that is reading 2.209. Any thoughts as to what could possible cause it to be off by a factor of 10?

  • 0
    TI__Expert 7975 points

    James,

    Are you doing anything different to this LM35 compared to the others? Have you tried swapping a known good LM35 and this unit to see if the issue tracks with the sensor or the PCB?

    Regards

    -Alex Thompson

  • 0 in reply to Alex Thompson
    Prodigy 10 points

    Doing nothing different and can't remove the part as it is epoxy potted into an assembly. Unfortunately the part was not tested prior to potting.

  • 0 in reply to James Brothen
    TI__Expert 7975 points

    James,

    Understood. Is it possible for you to capture the output of this bad output on an o-scope? The output of the LM35 cannot handle much of a capacitive load, so you may have a situation where the part reading badly has too large of a capacitive load, and is causing oscillations (and hence why it could be putting out this very large output).

    -Alex Thompson