--_003_BANLkTikQqtJPsUJYxiP8wPw3exN1ev7Amailgmailcom_
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Method of measuring temperature, using a silicon diode junction, that
could change your life ;-).
Cheap, easy, no calibration needed, 10 x more accurate than typical
diode based methods.

      : http://www.smsc.com/media/Downloads/Application_Notes/an1014.pdf

________________


> Years ago I used a 1N4148 for temperature sensing

There is a surprisingly little known method using any silicon diode
that is cheap, easy, needs no calibration and which is typically an
order of magnitude better than you will usually get with cheap
sensors.
(Choose any four !!!!)

ANY silicon diode can be used.
Accuracy of 0.1% easy enough [tm] to get.
Need to be able to set a current to two values and measure a voltage.
NO calibration is required and any silicon diode can be substituted
anytime desired.

This method is used by (at least) NatSemi to measure processor die
temperature using an embedded diode that is usually used for the much
less accurate ingle current diode voltage drop method that Oli
mentioned. They are exceptionally mealy mouthed about how the IC works
- presumably hoping that inobservant competitors will not copy them.

The method is based on the same  principle which the band gap
reference is based.
The CHANGE in voltage across a silicon junction with a known change of
current is a property solely [tm] of temperature and the properties of
silicon.

Delta V_junction =3D K.T.ln(Ihigh/Ilow)
T =3D absolute temperature.
See attachment and below.
As Ihigh and I low are fixed this reduces to

       Delta Vjn =3D K.T

Yeeha!
I ratio can be selected  to get a convenient scale factor.

Be ware of die heating (or allow for it).

The method is used by SMSC in their equipment and described in their
AN10.14. Note that this application note varies - the formula is NOT
given in older versions.
Bad: 1086, 2006
Good:  2009
I have a copy of the good version but so far no source.

Delta Vjunction =3D Z.K.T / Q . ln (Ihigh/Ilow)
See attachment for details.
Note Z :-(.
Still very good.

This is an application note for their EMC2105 which used this method.
            http://www.smsc.com/media/Downloads/Application_Notes/an171.pdf

Antiparallel diode sensing allows two temperatures to be sensed per
wire pair !!!

      Good (2009) :
http://www.smsc.com/media/Downloads/Application_Notes/an1014.pdf



 Russell McMahon

--_003_BANLkTikQqtJPsUJYxiP8wPw3exN1ev7Amailgmailcom_
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	name="AN Diode delta I temperature measurement_600_80.jpg"
Content-Description: AN Diode delta I temperature measurement_600_80.jpg
Content-Disposition: attachment;
	filename="AN Diode delta I temperature measurement_600_80.jpg"; size=12221;
	creation-date="Sun, 26 Jun 2011 06:35:17 GMT";
	modification-date="Sun, 26 Jun 2011 06:35:17 GMT"
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