I recently needed to get the temperature from an analog temperature device; my first attempt was the LM35C which worked great except that it didn't go into the negative temperature ranges. So, I threw some greenbacks at the LMT84LPM with the expectation that I could pretty much just swap out the two devices and change the math to come up with the temp. Well, that was a no go. Did a good bit of research on-line and read the data sheet, all of which lead me nowhere. In fact, no matter what I do, the value returned from the Arduino's Analog pin is 186. If I pinch the LMT84 between my thumb and forefinger I can get it to change, downwards, which is typical of the response to an increase in heat. However, I am never able to get results that are in the range of the data sheet.
A side note: The data sheet indicates the use of capacitors and resistors on the output pin. Whether I use the components or not, I still get the 186 value.