[time-nuts] T-Bolt Temperature

Arthur Dent golgarfrincham at yahoo.com
Fri Aug 17 02:37:14 UTC 2012

>Do you know the part number of a chip to replace the DS1620?

The part number is the same, DS1620. What is important is the 
revision of the DS1620. When Dallas Semiconductor/Maxim 
'improved' the chip and went from REV-D (or D2) to REV-E they
made a change in the way the data was sent to the outside world. 
Lady Heather displays the temperature from REV-E chips in 
distinct step instead of a smooth curve.

 I have used REV-C2 chips as replacement and they work just 
fine. Note the chip revision has little or nothing to do with the 
Trimble REV letter on the outside of the Thunderbolt case, the 
latest Thunderbolt revision from 2005 just happens to be a 


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