[time-nuts] Tbolt Temp Sensor

Arthur Dent golgarfrincham at yahoo.com
Sun Apr 24 01:29:39 UTC 2011


"One of these units appears to have an onboard temp 
sensor that is dead - the temp just reads -55.0C all the 
time.  This is the little Maxim/DallasDS1620 chip, which 
I can replace, but I had a few questions first."
++++++++++++++++++++++++

I've had about 50 Thunderbolts and at least 5 of them had 
a defective DS1620 chip. About 3 more were from late 
2004 or early 2005 and had the "E" revision chip that 
displays the temp in about 3/4 degree steps. Of the ones 
that failed the common failure mode was to display 
-54.999 degree C even though I'm sure it wasn't quite 
that cold in my shop. ;-)

If you replace the chip just make sure that the replacement 
chip is a "D" or "C" revision if you want the Lady Heather 
graph to look nice. 

  -Arthur


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