Sensors

[Brian Densmore]

> -----Original Message-----
> From: Jonathan Hutchins
> 
> 
> On Tuesday 20 January 2004 04:53 pm, Brian Densmore wrote:
> > > -----Original Message-----
> > > From: Jonathan Hutchins
...
> > > temp3:    +255.4°C  (limit =  +80°C, hysteresis =  +75°C)
> ...
> > > I think the temps are way off - I really doubt that I have
> > > something running at 255 degrees...
> 
> > Interesting temperature, 255, as in 2^8-1. I'd almost be tempted to
> > believe that temp3 isn't detecting anything and rather
> > than indicating a 0 temperature it is indicating an 'infinite'
> > temperature. The other two temps look realistic for CPU and case
> > temps respectively. You wouldn't happen to know what the third temp
> > is supposed to measure?
> 
> Come to think of it, I have CPU and MB sensors, but I don't 
> think there is a 
> third sensor.  Good call.  Where's the .4 come from though?
That's a complicated question that would be hard to answer without
a lecture in binary logic, digital electronics, and binary to decimal
conversion. That said, I suspect the .4 is just a random fluctuation
specific to your specific MB and could very well vary over time in your
MB and between yours and other MBs of the same series. If I am correct
and the circuit is converting temperature from an analog or decimal 
representation and storing it as a binary. It is because not all decimals
can be represented 'exactly' in binary logic. For example try to represent
1/37 using base 2. 

<disclaimer>
Of course I could be remembering my college coursework in electronics
and computer engineering wrong. It's been such a loooooooooong time and
I never get much chance to use it. ;)
</disclaimer>

Brian