Try the following.

Lm335 is 10mv / deg c
Set ref on chip or vcc to 5.12v
Therefore each count on the adc is 0.5 deg (5.12v / 1024 steps)or 5mV
Given in the lm335 data sheet is 25deg is 2.982v
0 deg c is therefore 2.732v (read as 2.730v) or a count of 546 dec
So degC = Vadc - 546 / 2 or 16 bit subtraction then RRF on the LSB and
its good for 0-48 deg

Regards Steve.....

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Dale Botkin
Sent: 18 November 2002 14:13
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]:Dividing In Asm (temp sensor)


On Mon, 18 Nov 2002, Peter McNulty wrote:

> I'd like to use these methods, but my temperature sensor must fit into

> small places which is why i'm considering the Lm335. I'd prefer to use

> a flat thermistor, however the non-linerality of the Temp-Voltage
> relationship makes it very difficult.

Dallas (now Maxim) DS18S02...  1-wire interface, TO-92 package, output
in degrees C.

Dale

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