Intel E1400 Design Guidelines - Page 118

Table 7-4. ATX FSC Settings

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Legacy Fan Speed Control Table 7-4. ATX FSC Settings Parameter Classification Processor Thermal Sensor PWM Output Notes THIGH TLOW Minimum PWM Duty Cycle PWM Frequency Spin-up time TAVERAGING When TSENSOR < TLOW All Fans ON Hysteresis Offset Required Required Required Required Suggested Suggested Suggested Suggested Suggested Required TCONTROL TCONTROL - 10 °C 35 sec Minimum PWM% TCONTROL + 3 °C 2 °C Thermal Diode Correction Factor 3, 5 3,5 20% 21-28 kHz 250 - ~500 ms 1 2, 6 6 4, 5 NOTES: 1. A PWM frequency of 25 kHz is the design target for the reference and for the Intel® Boxed Processor and the reference design. 2. Use the lowest time available in this range for the device selected. 3. To ensure compliance with the thermal specification, thermal profile and usage of the TSENSOR for fan speed control these setting should not be user configurable. 4. If present in the FSC device the Thermal Diode Correction Factor should be input to this register. 5. If the FSC device does not have a means to input a fixed temperature offset then: THIGH = TCONTROL + Thermal Diode Correction Factor and TLOW = TCONTROL + Thermal Diode Correction Factor. 6. If this function is present on the device it must be enabled 118 Thermal and Mechanical Design Guidelines

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Legacy Fan Speed Control
118
Thermal and Mechanical Design Guidelines
Table 7-4. ATX FSC Settings
Parameter
Classification
Processor Thermal
Sensor
PWM Output
Notes
T
HIGH
Required
T
CONTROL
3, 5
T
LOW
Required
T
CONTROL
– 10 °C
3,5
Minimum PWM Duty
Cycle
Required
20%
PWM Frequency
Required
21–28 kHz
1
Spin-up time
Suggested
250 – ~500 ms
2, 6
T
AVERAGING
Suggested
35 sec
6
When T
SENSOR
< T
LOW
Suggested
Minimum PWM%
All Fans ON
Suggested
T
CONTROL
+ 3 °C
Hysteresis
Suggested
2 °C
Offset
Required
Thermal Diode
Correction Factor
4, 5
NOTES:
1.
A PWM frequency of 25 kHz is the design target for the reference and for the Intel
®
Boxed Processor and the reference design.
2.
Use the lowest time available in this range for the device selected.
3.
To ensure compliance with the thermal specification, thermal profile and usage of the
T
SENSOR
for fan speed control these setting should not be user configurable.
4.
If present in the FSC device the Thermal Diode Correction Factor should be input to this
register.
5.
If the FSC device does not have a means to input a fixed temperature offset then:
T
HIGH
=
T
CONTROL
+ Thermal Diode Correction Factor and
T
LOW
=
T
CONTROL
+ Thermal Diode Correction Factor.
6.
If this function is present on the device it must be enabled