Intel QX9770 Design Guidelines - Page 106

Table 13. ATX FSC Settings, Table 14. BTX Fan Speed Control Settings, Parameter, Classification

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Legacy Fan Speed Control Table 13. 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 Required Required Required Required Suggested Suggested Suggested Suggested Suggested TCONTROL TCONTROL - 10 °C 20% 35 sec Minimum PWM% TCONTROL + 3 °C 2 °C 21-28 kHz 250 - ~500 ms 3 3 1 2, 4 4 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 this function is present on the device it must be enabled Table 14. BTX Fan Speed Control Settings Parameter Classification Processor Thermal Sensor System Ambient Sensor PWM Output Notes THIGH TLOW Minimum PWM Duty Cycle PWM Frequency Spin Up Time Required Required Required Required Suggested TAVERAGING When TSENSOR < TLOW All Fans On Hysteresis Suggested Suggested Suggested Suggested TCONTROL TCONTROL - 7 °C 4.0 sec Minimum PWM% TCONTROL + 3 °C 2 °C 54 °C 47 °C 4.0 sec Minimum PWM% 65 °C 4 °C PWM 1 (TMA) -20% 21-28 kHz 250 - ~ 500 ms 3,5 3,5 1 2, 7 3, 7 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. TAVERAGING = represents the amount of delay time before responding to the temperature change, defined in fan speed control device (sometimes called ramp range control or 106 Thermal and Mechanical Design Guidelines

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Legacy Fan Speed Control
106
Thermal and Mechanical Design Guidelines
Table 13. ATX FSC Settings
Parameter
Classification
Processor
Thermal Sensor
PWM Output
Notes
T
HIGH
Required
T
CONTROL
3
T
LOW
Required
T
CONTROL
– 10 °C
3
Minimum PWM Duty
Cycle
Required
20%
PWM Frequency
Required
21-28 kHz
1
Spin-up time
Suggested
250 - ~500 ms
2, 4
T
AVERAGING
Suggested
35 sec
4
When T
SENSOR
< T
LOW
Suggested
Minimum PWM%
All Fans ON
Suggested
T
CONTROL
+ 3 °C
Hysteresis
Suggested
2 °C
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 this function is present on the device it must be enabled
Table 14. BTX Fan Speed Control Settings
Parameter
Classification
Processor
Thermal
Sensor
System
Ambient
Sensor
PWM
Output
Notes
T
HIGH
Required
T
CONTROL
54 °C
3,5
T
LOW
Required
T
CONTROL
– 7 °C
47 °C
3,5
Minimum PWM
Duty Cycle
Required
PWM 1
(TMA) –20%
PWM Frequency
Required
21-28 kHz
1
Spin Up Time
Suggested
250 –
~ 500 ms
2, 7
T
AVERAGING
Suggested
4.0 sec
4.0 sec
3, 7
When T
SENSOR
<
T
LOW
Suggested
Minimum
PWM%
Minimum
PWM%
All Fans On
Suggested
T
CONTROL
+ 3 °C
65 °C
Hysteresis
Suggested
2 °C
4 °C
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.
T
AVERAGING
= represents the amount of delay time before responding to the temperature
change, defined in fan speed control device (sometimes called ramp range control or