[time-nuts] T-Bolt Temperature

Ron Ward n6idlron at comcast.net
Wed Aug 22 13:59:55 EDT 2012


Hi:
What is the temp chip reading? Is it reading the oven temperature or just
the ambient temperature?
Ron

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Azelio Boriani
Sent: Friday, August 17, 2012 7:57 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] T-Bolt Temperature

No, IIRC the problem is indeed with the chip because the new silicon
release has no higher resolution temperature reading. The old chip allows
this reading via an unofficial feature that the new chip has no longer. The
TBolt firmware exploits this unofficial (but documented and known) method
of reading.

On Fri, Aug 17, 2012 at 3:29 PM, <bg at lysator.liu.se> wrote:

> It would be a worthy hack (in the classic sense) to extract the Tbolt
> firmware and patch it to work with the current temperature chips.
>
> --
>
>      Björn
>
> > Hi
> >
> > Just in case this inadvertently heads of in the wrong direction
.
> >
> > Lady Heather displays exactly what the TBolt firmware comes up with. The
> > disconnect with the new sensor chip is between the TBolt firmware and
the
> > chip it's self.
> >
> > Bob
> >
> > On Aug 16, 2012, at 10:37 PM, Arthur Dent <golgarfrincham at yahoo.com>
> > wrote:
> >
> >>> 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
> >> REV-E.
> >>
> >> -Arthur
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>
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