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Thermal Management
Within the processor, the DTS converts an analog signal into a digital value
representing the temperature relative to PROCHOT# circuit activation. The conversions
are in integers with each single number change corresponding to approximately 1°C.
DTS values reported via the internal processor MSR will be in whole integers.
As a result of the PECI averaging function described above, DTS values reported over
PECI will include a 6-bit fractional value. Under typical operating conditions, where the
temperature is close to PROCHOT#, the fractional values may not be of interest. But
when the temperature approaches zero, the fractional values can be used to detect the
activation of the PROCHOT# circuit. An averaged temperature value between 0 and 1
can only occur if the PROCHOT# circuit has been activated during the averaging
window. As PROCHOT# circuit activation time increases, the fractional value will
approach zero. Fan control circuits can detect this situation and take appropriate action
as determined by the system designers. Of course, fan control chips can also monitor
the PROCHOT# pin to detect PROCHOT# circuit activation via a dedicated input pin on
the package.
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Datasheet
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