Intel E6700 - Core 2 Duo Dual-Core Processor User Manual

Intel® Quiet System Technology (Intel® QST)
Thermal and Mechanical Design Guidelines 65
temperature to the target temperature. As a result of its operation, the PID control
algorithm can enable an acoustic-friendly platform.
Figure 7-2. PID Controller Fundamentals
For a PID algorithm to work limit temperatures are assigned for each temperature
sensor. For Intel QST, the T
CONTROL
for the processor and chipset are to be used as the
limit temperature. The ME will measure the error, slope and rate of change using the
equations below:
• Proportional Error (P) = T
LIMIT
– T
ACTUAL
• Integral (I) = Time averaged error
• Derivative (D) = ΔTemp / ΔTime
Three gain values are used to control response of algorithm.
• Kp = proportional gain
• Ki = Integral gain
• Kd = derivative gain
The Intel
®
Quiet System Technology (Intel
®
QST) Configuration and Tuning Manual
provides initial values for the each of the gain constants. In addition it provides a
methodology to tune these gain values based on system response.
Finally, the fan speed change will be calculated using the following formula:
ΔPWM = -P*(Kp) – I*(Ki) + D*(Kd)
Proportional
Error
Derivative (Slope)
Integral (time averaged)
Proportional
Error
Derivative (Slope)
Integral (time averaged)
Proportional
Error
Derivative (Slope)
Integral (time averaged)
Proportional
Error
Derivative (Slope)
Integral (time averaged)
RPM Temperature
Time
+ dPWM
+ dPWM
+ dPWM
+ dPWM
+ dPWM
+ dPWM
-
-
dPWM
dPWM
-
-
dPWM
dPWM
-
-
dPWM
dPWM
Actual
Temperature
Actual
Temperature
Fan
Speed
Fan
Speed
Limit
Temperature
Limit
Temperature

Intel E6700 - Core 2 Duo Dual-Core Processor Specifications

General

Processor Number	E6700
Number of Cores	2
Number of Threads	2
Base Frequency	2.66 GHz
Cache	4 MB L2 Cache
Bus Speed	1066 MHz
TDP	65 W
Socket	LGA 775
Lithography	65 nm
Instruction Set	64-bit
Virtualization Technology	VT-x
Memory Types	DDR2
Release Date	July 2006