Processor Thermal/Mechanical Information
20 Thermal and Mechanical Design Guidelines
Section 3.1). The intercept on the thermal profile assumes a maximum ambient
operating condition that is consistent with the available chassis solutions.
To determine compliance to the thermal profile, a measurement of the actual
processor power dissipation is required. The measured power is plotted on the
Thermal Profile to determine the maximum case temperature. Using the example in
Figure 2-3 for the Intel
®
Core
™
2 Duo processor with 4 MB cache at Tc-max of 60.1 °C
dissipating 50 W, the maximum case temperature is 56.2 °C. See the datasheet for
the thermal profile.
Figure 2-3. Example Thermal Profile
2.2.3 T
CONTROL
T
CONTROL
defines the maximum operating temperature for the digital thermal sensor
when the thermal solution fan speed is being controlled by the digital thermal sensor.
The T
CONTROL
parameter defines a very specific processor operating region where fan
speed can be reduced. This allows the system integrator a method to reduce the
acoustic noise of the processor cooling solution, while maintaining compliance to the
processor thermal specification.
Note: The T
CONTROL
value for the processor is relative to the Thermal Control Circuit (TCC)
activation set point which will be seen as 0 via the digital thermal sensor. As a result
the T
CONTROL
value will always be a negative number. See Chapter 4 for the
discussion the thermal management logic and features and Chapter
7 on Intel
®
Quiet
System Technology (Intel
®
QST).
The value of T
CONTROL
is driven by a number of factors. One of the most significant of
these is the processor idle power. As a result a processor with a high (closer to 0 )
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