[time-nuts] 2004 & 2005 Tbolts w. the bad temp chip

Sylvain RICHARD sr75pro at free.fr
Sun Feb 12 20:43:10 UTC 2012

Le 12/02/2012 19:58, cfo wrote:
> I recently got 2 tbolts , and i'm quite sure they have the "bad"
> temperature chip.
> They say mfg date : 2004 and 2005 in heather
> I have a 2003 Tbolt , that shows and updates the temperature constantly.
> And the "yellow temp graph" is "natural".
> The 2004&  2005's does rarely update , and the graph jumps 4 x 250mC , in
> one jump like a Schmitt-Trigger.
> I'm quite sure i read that someone here on the list had a "reel" of the
> old good sensors , but i can't seem to find the posting.
> Any hints
> time-nut beginner
> Denmark

Googling "DS1620 site:febo.com" should give you the relevant details.
And I bought some chips from French eBay seller philing2003. His chips 
are rev D1 and work fine. Rev E chips produce staircase-looking curves 
because Maxim changed the high-res temperature protocol while Trimble 
didn't adapt.


Good night,


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