CT60e new features.

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troed
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Re: CT60e new features.

Postby troed » Sat Feb 03, 2018 5:52 pm

Alright, thanks guys, I'll calibrate ;)

786 Ohm is what I have at ambient desk temp (~23.5 degrees it seems) with the -004.
Last edited by troed on Sat Feb 03, 2018 6:29 pm, edited 1 time in total.

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willy
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Re: CT60e new features.

Postby willy » Sat Feb 03, 2018 5:57 pm

czietz wrote:Note that the values are wrong. From the 68060's errata sheet:
S3- The nominal resistance and temperature coefficient of the internal die resistor connected
across the thermal sensing pins (THERM1, THERM0) as listed in the User's Manual (rev. 1)
on page 2-16 is incorrect. The correct value for the temperature coefficient is approximately
2.8 ohms/ degree C. The correct value for the nominal resistance is approximately 780
ohms at 25 degrees C.


Also, as willy notes, it says "approximately". Nowhere in the data sheet (or errata sheet) Motorola/Freescale/NXP commit to give actual minimum and maximum values for slope and resistance at 25°C. This means that they can be as inaccurate as they want! Uncalibrated, on-die sensor are usually fairly inaccurate, maybe in the range of +/-10°C, maybe even worse.


Thanks @czietz i forgot about errata :)

Newest processors are using silicon diode as a thermal sensor, it's much more accurate. (https://en.wikipedia.org/wiki/Silicon_b ... ure_sensor)

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trecool
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Re: CT60e new features.

Postby trecool » Sat Feb 03, 2018 8:15 pm

I have this weird "bad tempreture values" message on cold boot.
I have send the board back at Willy and worked fine for him so I assume it has to do with the 060 cpu.
Can't be sure though since I have no spare 060 to try.
Anyone with the same experience?

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Re: CT60e new features.

Postby fidzen » Sat Feb 03, 2018 8:43 pm

trecool wrote:I have this weird "bad tempreture values" message on cold boot.
I have send the board back at Willy and worked fine for him so I assume it has to do with the 060 cpu.
Can't be sure though since I have no spare 060 to try.
Anyone with the same experience?


I have the same error message, and I know of other users also having this problem.
The CT60e is working fine, but I get the error message when cold booting.
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troed
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Re: CT60e new features.

Postby troed » Sun Feb 04, 2018 12:28 pm

troed wrote:Alright, thanks guys, I'll calibrate ;)

786 Ohm is what I have at ambient desk temp (~23.5 degrees it seems) with the -004.


... and 876 Ohm at 25.5 degrees for the -006

This indicates a roughly ~30 degrees difference in measured values between the -004 and -006. Since the -006 runs ~20 degrees "hotter" when using the measured values, this means it's in reality 10 degrees cooler.

I'd suggest measuring your 68060 CPUs before inserting them in the CT60e socket, that way you can get a much better approximation of the real CPU temperatures :) This difference was a lot larger than I expected.

Screen Shot 2018-02-04 at 13.24.48.png
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czietz
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Re: CT60e new features.

Postby czietz » Sun Feb 04, 2018 1:46 pm

troed wrote:This difference was a lot larger than I expected.


Back when I started designing electronics I also learned the hard way that words like "approximately" or "typical" in data sheets are code words for "we make no promises whatsoever". Lesson: Don't trust anything where there are no minimum and maximum values given in the data sheet. :)


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