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PICList Thread
'Thermo Couple Interface'
1997\03\05@025758 by lmclaren

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Gday all,
I have a need to interface a thermo couple to a pic,  I believe that
there is a special purpose ic out there that not only scales but also
corrects the output to allow for nonlineararity and presents you with a
voltage/temp value or better still I2C of SPI.
Anybody know its name/manufacture?

Thanks
--
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Comstra pty. ltd.                    .....lmclarenKILLspamspam@spam@comstra.com.au
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1997\03\05@104628 by Brian Read

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>
> Gday all,
> I have a need to interface a thermo couple to a pic,  I believe that
> there is a special purpose ic out there that not only scales but also
> corrects the output to allow for nonlineararity and presents you with a
> voltage/temp value or better still I2C of SPI.
> Anybody know its name/manufacture?
>
> Thanks
> --
> Lee McLaren                          lmclarenspamKILLspamtrumpet.com.au
>
Lee,

Analog devices AD594/AD595 depending on flavor of TC, J/K respectivly.
Not I2C or SPI, but still nice parts.

Brian


--

1997\03\06@030800 by lmclaren

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Brian Read wrote:
{Quote hidden}

Thankyou for the info.
Regards
--
Lee McLaren                          EraseMElmclarenspam_OUTspamTakeThisOuTtrumpet.com.au
Comstra pty. ltd.                    lmclarenspamspam_OUTcomstra.com.au
2 Kirksway place                     phone       03 62244488
Hobart Tasmania                      fax         03 62244601
Australia 7000                       mobil       018 138682

'It was five hours of Boggs's "channelling". After three hours
I asked him to summon up the soul of Jimi Hendrix and requested
All Along the Watchtower. You know, the guy's been dead
twenty years but he still hasn't lost his edge'
Mulder

1997\03\06@173048 by Larry G. Nelson Sr.

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Analog Devices used to make a chip like that. I think it was an AD590. It
did cold junction compensation and gave a linear voltage output for the
temperature.


At 06:53 PM 3/5/97 +1100, lmclaren wrote:
{Quote hidden}

Larry G. Nelson Sr.
RemoveMEL.NelsonTakeThisOuTspamieee.org
http://www.ultranet.com/~nr

1997\03\06@223205 by Eric Smith

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lmclaren <spamBeGonelmclarenspamBeGonespamTRUMPET.COM.AU> wrote:
> I have a need to interface a thermo couple to a pic,  I believe that
> there is a special purpose ic out there that not only scales but also
> corrects the output to allow for nonlineararity and presents you with a
> voltage/temp value or better still I2C of SPI.
> Anybody know its name/manufacture?

If you just need a temperature sensor but not necessarily a thermocouple,
you could use the National Semiconductor LM75.  It is a temperature
sensor in an 8 pin SO package with an I2C interface, it costs around
US $1.60 in hundred lots, and there's a free demo board available:
       http://www.national.com/pf/LM/LM75.html

Cheers,
Eric

1997\03\07@015159 by John Dammeyer

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At 05:29 PM 06/03/1997 -0500, you wrote:
>Analog Devices used to make a chip like that. I think it was an AD590. It
>did cold junction compensation and gave a linear voltage output for the
>temperature.
>

Sorry no.  AD590 is an expensive but fairly accurate temeprature sensing
device that outputs 10 uA per degree Kelvin.

A thermocouple needs Cold Junction Compensation and linearization in order
to properly function.  ie:  The thermocouple wire is brought to a connector
block that that has a temperature sensor connected to it (like an AD590).
Then the voltage is measured and put into a polynomial to determine the
actual temperature measured at the other end of the thermocouple wire.

Easiest way to do the CJ compensation is to use the LT1025 from Linear
Technologies.  Set a jumper for whcih type of thermocouple you are using and
make it physically close to your terminal block and Voila` It gives you the
value you need for K or J or T type thermocouples.  For a really good
description on how to use thermoouples get an OMEGA catalog.  It's the
definitive description and has all the tables you need.

Regards,

John
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