Intel Core2 Duo Desktop Processor, Intel Pentium Processor, and Intel Pentium 4 Processor 6x1 Sequence

Processor Thermal/Mechanical Information
20 Thermal and Mechanical Design Guidelines
Figure 3. Example Thermal Profile
40
50
60
70
0 10203040506070
Power (W)
Case Temperature (°C)
Thermal Profile
TDP
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 )
T
CONTROL
will dissipate more power than a part with lower value (farther from 0, e.g.,
more negative number) of T
CONTROL
when running the same application.
The value of T
CONTROL
is calculated such that regardless of the individual processor’s
T
CONTROL
value the thermal solution should perform similarly. The higher power of
some parts is offset by a higher value of T
CONTROL
in such a way that they should
behave similarly in the acoustic performance.
This is achieved in part by using the Ψ
CA
vs. RPM and RPM vs. Acoustics (dBA)
performance curves from the Intel enabled thermal solution. A thermal solution
designed to meet the thermal profile would be expected to provide similar acoustic
performance of different parts with potentially different T
CONTROL
.