Intel E6420 Design Guidelines - Page 116
Table 7-3. FSC Definitions - reviews
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Legacy Fan Speed Control To use all of the features in the Intel reference heatsink design or the Boxed Processor, system integrators should verify the following functionality is present in the board design. Please refer to the Fan Specification for 4 wire PWM Controlled Fans and Chapter 6 for complete details on the Intel enabled thermal solution. The basics of Fan Speed Control were discussed in Chapter 7, as a review the FSC definitions are listed in Table 7-3. Table 7-3. FSC Definitions Item Definition TSENSOR TCONTROL Thermal Diode Offset Thermal Diode Base Thermal Diode Correction Factor TLOW Hysteresis THIGH All Fans ON Min PWM Spin-up PWM Freq TAVERAGING Temperature reported from the processor on-die thermal sensor. TCONTROL is the specification limit for use with the on-die thermal sensor. Thermal Diode Offset is the MSR value programmed into the processor with the ondie thermal diode to account for perceived diode ideality shift. The constant published in the processor datasheet for calculating Thermal Diode Correction Factor. Thermal Diode Correction Factor is the sum of the Thermal Diode Offset and Thermal Diode Base. This value is used to compensate for temperature errors if the diode ideality factor is near the maximum or minimum values. It is only used for HW Monitor components that measure the on-die thermal diode using the diode model. The temperature above which the fan will begin to accelerate in response to the on-die thermal sensor temperature. The number of degrees below TCONTROL the fans will remain on before slowing down. The temperature at which the fan is operating at full speed (100% PWM Duty Cycle). By specification this is TCONTROL. The processor temperature at which all fans in the system are increased to 100% Duty Cycle. Minimum pulse width modulation (% duty cycle) that the fans will run at when TSENSOR is less than TLOW. Amount of time fan is run at 100% duty cycle to overcome fan inertia. The operating frequency of the PWM signal. The time (in seconds) that elapses while the fan is gradually sped up in response to a processor temperature spike. 116 Thermal and Mechanical Design Guidelines