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'[EE]: LOW COST TEMPERATURE SENSOR'
2003\01\04@184050 by TNT

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Hi All,

I am looking for a low cost Temperature Sensor...  I found the LM86, it is USD 1.99$.  Do you know an IC or a way to mesure temperature that is very cheap?

Thanks a lot,


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Pascal

2003\01\04@190826 by Andy Kunz

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Regular old diodes are very thermally sensitive.  They aren't well matched
between individual pieces, but once calibrated they work well.

Andy

At 06:40 PM 1/4/03 -0500, you wrote:
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2003\01\04@192528 by Mike Singer

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Pascal wrote:
> I am looking for a low cost Temperature Sensor...  
> I found the LM86, it is USD 1.99$.  Do you know
> an IC or a way to mesure temperature that is very cheap?

  Please, do search PICList with "Temperature Sensor"

  Anyway, have look at Microchip's TCN75 2-Wire Serial Temperature Sensor and Thermal Monitor (21490b.pdf).

Features:
Solid-State Temperature Sensing 0.5°C Accuracy (Typ.)
Operates from -55°C to +125°C

  Here in the Ukraine local Microchip folks sell them
for  $1.24 retail.

  Mike.

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2003\01\04@224215 by Spehro Pefhany

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At 07:05 PM 1/4/03 -0500, you wrote:
>Regular old diodes are very thermally sensitive.  They aren't well matched
>between individual pieces, but once calibrated they work well.

The difference in Vf of a diode-connected transistor between at two
currents about 10:1 different is quite repeatable, though the sensitivity
is reduced by about 10:1 compared to the diode.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
spam_OUTspeffTakeThisOuTspaminterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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2003\01\05@004237 by PicDude

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Try the LM50, LM61, LM62 -- should be about half that price IIRC.
Or do what I do -- use Digikey as an excellent search tool.  :-)

Cheers,
-Neil.




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