IT8705F Data Sheet and Help

Mark D. Studebaker mds at paradyne.com
Wed Oct 31 03:19:35 CET 2001


Vref is known so I backed into some formulas based on the 2V
nominal value in the datasheet.
I put the formulas in sensors.conf.eg in CVS.

Also, for the temp, try changing the sensor type,
see doc/chips/it87.


"Mark D. Studebaker" wrote:
> 
> ITE http://www.ite.com.tw
> 
> See figure 10-4 and the following formulas in the 8705 and 8712
> datasheets.
> The 8705 datasheet I have has the wrong formula, the 8712 is right.
> You need to know Rin, Rf, and Vref to compute the correct formula.
> Unfortunately, since the datasheet doesn't give the board designer a
> recommendation, you will have to find and measure the values on
> your board.
> 
> I'll put the formulas in sensors.conf.eg so others can find it.
> 
> mds
> 
> Kris Kersey wrote:
> >
> > Guys,
> >
> > Could you help me get the math right on several of the IT8705F
> > sensors?  The readout of my sensors is below.  There are definate problems
> > with -12V, -5V, and Temp2/CPU.  It also seems that the Vcore 1 could be
> > slightly off.  On my motherboard (SOYO K7V DRAGON Plus!) I also wanted
> > note that there was no need to compute in2.  Finally, in the headers,
> > there is an IN8 define and it doesn't appear that it should be
> > there.  Help is appreciated but a link to the datasheet would also be nice
> > if you don't have the time.
> >
> > it87-isa-0290
> > Adapter: ISA adapter
> > Algorithm: ISA algorithm
> > VCore 1:   +1.85 V  (min =  +1.66 V, max =  +1.82 V)   ALARM
> > VCore 2:   +2.48 V  (min =  +2.40 V, max =  +2.60 V)
> > +3.3V:     +3.31 V  (min =  +3.13 V, max =  +3.45 V)
> > +5V:       +5.02 V  (min =  +4.72 V, max =  +5.24 V)
> > +12V:     +12.00 V  (min = +11.36 V, max = +12.60 V)
> > -12V:      -7.34 V  (min = -11.38 V, max = -12.53 V)   ALARM
> > -5V:       -6.61 V  (min =  -4.70 V, max =  -5.15 V)   ALARM
> > Stdby:     +4.99 V  (min =  +4.72 V, max =  +5.24 V)
> > fan1:        0 RPM  (min =    0 RPM, div = 2)
> > fan2:     5818 RPM  (min = 3000 RPM, div = 2)
> > Temp1/MB:    +40C  (min =  +20C, max =  +40C)
> > Temp2/CPU:  +114C  (min =  +25C, max =  +45C)
> >
> > I used the latest sensors.conf.eg from CVS for above.  Note the changes
> > mentioned.
> >
> > Thanks,
> > Kris Kersey
> > LinuxHardware.org Site Manager
> > augustus at linuxhardware.org



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