Heathkid:"What is the higher resolution variant of the DS1620
and how can one tell the difference from the chip markings?”
If you read the middle line on the DS1620 temperature chip
you may see "0310D1" where the 5th character is a capital
"D". The 03 is the year and the 10 may be the month of the
year. The D1 is the revision code. The "C" version was
before maybe 2000 so you won't see those unless they are
used as replacements and the "E" ("bad") revision wasn't
used until late 2004. -Arthur
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