What model of DS18S20 to get?
jefm
Posts: 50
Hi gang,
Simple question but I wanted to make sure I order the right thing. I need to set up a twenty~ thermometer network on a Stamp, was going to get them from Digikey and just wanted to make sure that the "DS18S20ND" is the proper part. Linkage:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=DS18S20+-ND
There are several models of DS18S20 and I didn't want to pick the wrong one. thanks for any help!
Post Edited (Jef Miller) : 7/9/2008 2:15:53 PM GMT
Simple question but I wanted to make sure I order the right thing. I need to set up a twenty~ thermometer network on a Stamp, was going to get them from Digikey and just wanted to make sure that the "DS18S20ND" is the proper part. Linkage:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=DS18S20+-ND
There are several models of DS18S20 and I didn't want to pick the wrong one. thanks for any help!
Post Edited (Jef Miller) : 7/9/2008 2:15:53 PM GMT
Comments
from here www.maxim-ic.com/quick_view2.cfm/qv_pk/2815/t/or.
I would suggest you stick with the TO-92 form, and see Note 3. at the URL above. It has a link
to a full explanation of the suffix codes used.
Also try a keyword search on just 18S20 (no -ND) and pick one with a minimum quantity of one (1)
else you'll have to buy hundreds or thousands!
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-Rusty-
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Rusty Haddock <=> AE5AE
**Out yonder in the Van Alstyne (TX) Metropolitan Area**
Microsoft is to software what McDonalds is to gourmet cooking
Post Edited (Fe2o3Fish) : 7/9/2008 3:47:38 PM GMT
BS2p, BS2pe and BS2px. The other Stamps cannot do one-wire protocol without an external bridge chip.
The DS18S20 is an older model of the chip. For about the same cost, you can buy the DS18B20, with a "B" instead of an "S". The main difference is that the DS18B20 provides 12 bits of resolution (1/16 degree Celsius), whereas the DS18S20 provides 9 bits (1/2 degree). It is possible to read the DS18B20 to higher resolution, but it takes extra i/o steps to read registers and do calculations, and they dispensed with that in the DS18B20. Be forewarned that the PBASIC code to read the "B" version is a little different from the code for the "S" version. Both are speced for 1/2 degree Celsius accuracy over the range of +10 to +85 Celsius, but will work over the full automotive temperature range.
Another option is the DS1822, which is lower cost, with 12 bit resolution but with an claimed accuracy of +/- 2 degrees Celsius.
The TO92 package is probably your best bet. They all come in that, as well as an 8 pin narrow SOIC, and the "B20" also comes in an 8-pin uMax form factor but avoid those unless you know what you are doing! BTW, a "+" after the part number means it is Pb-free.
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Tracy Allen
www.emesystems.com
The DS-18B20 is a good choice. Thanks to Tracy Allen I have a working program for you. This one has Debug Output and you
can easily change it for parallel of serial output. If you have more than one sensor you will have to identify each one.
Here it is.
Dave
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D. A. Wreski