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From: "Antony N. Lord"
Subject: LM35 Temperator Sensor Design Help
User-Agent: MT-NewsWatcher/3.1 (PPC)
Date: Mon, 23 Dec 2002 07:24:07 GMT
NNTP-Posting-Date: Mon, 23 Dec 2002 18:24:07 EST
Organization: BigPond Internet Services (http://www.bigpond.net.au)
Seasons Greetings People!
I am wondering if someone could help me interpret the information on the
LM35 Precision Centigrade Temperature Sensor and assist in design of
suitable electronics around it.
I need to install several remote temperature sensors (LM35), run over
some spare Cat 5 cable to a PC interface (Weeder Technologies Analog
* Runs to sensors are less than 10m over Cat 5 ethernet cable (4 - 8
* Interface has 5V, 12V and a variable 3-12V supply rail available
* Interface board input range 0-4095 mA (source impedance 8k ohm max)
* My temperature measuring range is from -5°C (fridge) to about 45°
(hottest day here) perhaps even 80° for measuring some electrical items
My greatest problem is correct selection of component values for the
right temperature range. The ranges shown in several figures of the
"Typical Applications" section of the data sheet are not adequate.
Figures 6 & 8 appear to be good starts.
If anyone can offer advice as to the "best approach" perhaps with some
working so I might glean an understanding as to the calculations it
would be most appreciated!
*** Take the letter 'X' out of my e-mail address if replying via e-mail
LM 35 Data Sheet :
LM 35 Application Notes
Weeder Tech Analog Input Module
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