[time-nuts] T-Bolt Temperature

[Michael Blazer]

The DS1620 is located just behind the RS-232 connector. This is on the 
far corner from the oscillator.

Mike

On 8/22/2012 12:59 PM, Ron Ward wrote:
> 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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