I found this bit 'o code for reading the DS1620 temperature sensor chip.  The 
comments at the beginning explain what is probably going on with the newer 
Thunderbolts.  Trimble is apparently doing the "old style" register reads and 
cannot access the high resolution counter register in the newer DS1620 chips.

http://www.hawo.stw.uni-erlangen.de/misc/temperatur/dstempd.c


Also the older chips returned a (temperature dependent) divisor value that 
could apparently yield around 0.01C resolution.  The newer chips return a 
divisor that is fixed at 16...  0.0625C resolution.



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