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I was planning to use an LM75 for a temperature sensor for a weather station I'm building until I read the datasheet and found that its accuracy is only +/- 2C.
Is there another sensor I can use that's accurate to +/- 0.5C in the temperature range -10C to 50C?
Maxim (aka Dallas Semiconductor) carries single chip silicon-based temperature sensors accurate to 0.5C:
The DS600 is the only analog output device they have with that accuracy: http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4253
Needless to say, you could do the same thing with an RTD (with a much greater stability and accuracy over a much larger temperature range) at greatly increased cost, complexity, and hard to find parts.
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