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Old 17 March 2010, 20:11   #1
Nikolaj_sofus
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mc68060rc50 internal heat sensor

does anyone know how exactly the internal heatsensor works?

i tried to measure on the pins of my apollo acc, so i can conclude that it's not a pt100 resistor.

another thing, how much heat does the cpu tolerate?

Thought that this would be useful information if i should overclock
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Old 18 March 2010, 14:59   #2
Chain
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it should be 400 ohm at 25 celsius according to datasheet, but there isnt anything about PTC/NTC type so you need to calibrate it yourself

Last edited by Chain; 18 March 2010 at 15:10.
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Old 18 March 2010, 15:16   #3
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RTFM:

2.12 THERMAL SENSING PINS (THERM1, THERM0)

THERM1 and THERM0 are connected to an internal thermal resistor and provide information about the average temperature of the die. The resistance across these two pins is proportional to the average temperature of the die. The temperature coefficient of the resistor is approximately 1.2 Ω/°C with a nominal resistance of 400 Ω at 25°C.
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Old 19 March 2010, 20:30   #4
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thanks
I will try to solder a couple of wires to the pins and put up my multimeter at some point so i can see how hot it actually gets.

I also modified a copper heatsink to fit in the desktop wedge, so no i need to get some heat adhesive tape to stick it to the cpu and a gap pad to lay on top of it to see if it would lead some of the heat on to the keyboard.

I'm also on the lookout for a fan which blow the air out horisontaly, so i can actually fit it in the amiga and get the air in the right direction.
Does anyone know where to get this?
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Old 19 March 2010, 22:40   #5
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Old notebooks can be a source for vertical fans (which blows air horizontally).
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Old 10 August 2020, 11:26   #6
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I know that this thread is a little stale. Nevertheless, I think that I do have some useful addition to the content in here.

Please don't rely on the resistance numbers posted in the 68060 user manual. There's a notice in the errata sheet regarding temperature reading (http://powerphenix.com/ct60/060_mask40.pdf, Spec Changes section, S3).

The actual resistance at 25°C is 780 Ohms, with a temperature coefficient of 2.8 Ohms/°C.

Example (A4000 in custom Tower, Matze's TK060, Rev.6@100 MHz, after 1/2h POVRay):
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Old 10 August 2020, 20:49   #7
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Whoa! - I want one of those ^^^^
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Old 10 August 2020, 22:18   #8
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Quote:
Originally Posted by buggs View Post
Example (A4000 in custom Tower, Matze's TK060, Rev.6@100 MHz, after 1/2h POVRay):
Sorry for OT, but what is "Matze's TK060"? Google doesn't come up with anything useful for me..
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Old 10 August 2020, 23:19   #9
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Quote:
Originally Posted by hooverphonique View Post
Sorry for OT, but what is "Matze's TK060"? Google doesn't come up with anything useful for me..
This is a WIP 040/060 card by M. Heinrichs for A3000/A4000 which was recently announced at A1k.org. It'll most probably be open source once it works as intended. The card is not aimed to be feature-rich and (just) contains CPU socket, 128 MB onboard RAM and an I2C temperature/voltage sensor.
Up to now, most of Matze's projects were aimed at the DIY crowd. Some people do offer pre-built hardware based on these projects over at AmiBay.
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