Intel E8200 BX80570E8200A User Manual

Thermal and Mechanical Design Guidelines   

 67 

target temperature. As a result of its operation, the PID control algorithm can enable 

an acoustic-friendly platform. 

 

+ dPW

M

+ d

PW

M

+ dPW

M

+ d

PW

M

+ dPW

M

+ d

PW

M

-

-

dP

WM

dP

WM

-

-

dP

WM

dP

WM

-

-

dP

WM

dP

WM

 

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

 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)