[ts-7000] TS-7200, max197, and lm34 weirdness

["Yan Seiner" <>]

I hooked up a handful of LM34 temp probes to my MAX197 A/D.  The LM34 is a
temp probe that puts out 10mv/degree, so at 72 degrees it would put out
.72V.

Pretty simple.

However, I'm seeing very weird behavior.  At 65 degrees and below, the A/D
starts reporting .29V.  This is consistent over 6 LM34s and 6 channels.

As soon as the LM34 gets above 65 or 66 degrees, it starts reporting
normally.

Also, I get 0.29V on any unconnected pin of the max 197.

I have no idea why.  Can anyone shed any light on this?

-- 
If you have eight hours to chop down a tree
spend six sharpening your axe.
--Abraham Lincoln



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