On Monday 07 August 2006 08:40, Timothy Weber wrote:
> PicDude wrote:
> > I have determined at this point that I can reproduce equivalent
> > functionalities of the DS2450, DS18B20, and others using a PIC.
>
> I've always liked the DS18B20 for one-off projects, but I'm also looking
> to move to something with a reliable source.  (Mouser actually lists
> these as "Obsolete.")

Uh-oh .... haven't seen that yet, but not a problem now.


> One key feature for me is that the TO-92 form factor makes it easy to
> throw a 2- or 3-wire cable on it and use it directly as a remote probe.
>   The other is that you don't have to calibrate it per-unit or per-batch
> (unlike thermistors, yes? haven't used them myself).

The SSOP/SOIC form factors work well as I do this on a small 1/32" PCB with a 
relatively large hole on the PCB under the package (better heat transfer).  
Then the back of the PCB can be stuck to the point that needs to be measured.  
I'm thinking SOT-23 sensor + SOT 10F PIC would work well.  For these apps, a 
few percent accuracy is fine.


> The new Microchip MCP970x family has both these features (though it's
> not as accurate in the TO-92 package).  I've got a few samples coming;
> has anyone else tried them yet?
> And, are there any other alternatives that come to mind?

Not tried, but there are also other parts.  National Semi has tons of temp 
sensors in many different packages, and they have great support.

Cheers,
-Neil.



> --
> Timothy J. Weber
> http://timothyweber.org
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