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Intel Q9400S Design Guidelines - Page 23

Example Thermal Profile

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Processor Thermal/Mechanical Information Figure 3. Example Thermal Profile 2.2.3 TCONTROL TCONTROL defines the maximum operating temperature for the digital thermal sensor when the thermal solution fan speed is being controlled by the digital thermal sensor. The TCONTROL parameter defines a very specific processor operating region where fan speed can be reduced. This allows the system integrator a method to reduce the acoustic noise of the processor cooling solution, while maintaining compliance to the processor thermal specification. Note: The TCONTROL value for the processor is relative to the Thermal Control Circuit (TCC) activation set point which will be seen as 0 via the digital thermometer. As a result the TCONTROL value will always be a negative number. See Chapter 4 for the discussion of the thermal management logic and features and Chapter 6 on Intel® Quiet System Technology (Intel® QST). The value of TCONTROL is driven by a number of factors. One of the most significant of these is the processor idle power. As a result a processor with a high (closer to 0) TCONTROL will dissipate more power than a part with lower value (farther from 0, e.g., more negative number) of TCONTROL when running the same application. This is achieved in part by using the CA vs. RPM and RPM vs. Acoustics (dBA) performance curves from the Intel enabled thermal solution. A thermal solution designed to meet the thermal profile would be expected to provide similar acoustic performance for different parts with potentially different TCONTROL values. The value for TCONTROL is calculated by the system BIOS based on values read from a factory configured processor register. The result can be used to program a fan speed Thermal and Mechanical Design Guidelines 23

Section	Page
1 Introduction	11
1.1 Document Goals and Scope	11
1.1.1 Importance of Thermal Management	11
1.1.2 Document Goals	11
1.1.3 Document Scope	12
1.2 References	13
1.3 Definition of Terms	14
2 Processor Thermal/Mechanical Information	17
2.1 Mechanical Requirements	17
2.1.1 Processor Package	17
2.1.2 Heatsink Attach	19
2.1.2.1 General Guidelines	19
2.1.2.2 Heatsink Clip Load Requirement	19
2.1.2.3 Additional Guidelines	20
2.2 Thermal Requirements	20
2.2.1 Processor Case Temperature	20
2.2.2 Thermal Profile	21
2.2.3 TCONTROL	23
2.3 Heatsink Design Considerations	24
2.3.1 Heatsink Size	25
2.3.2 Heatsink Mass	25
2.3.3 Package IHS Flatness	26
2.3.4 Thermal Interface Material	26
2.4 System Thermal Solution Considerations	27
2.4.1 Chassis Thermal Design Capabilities	27
2.4.2 Improving Chassis Thermal Performance	27
2.4.3 Summary	28
2.5 System Integration Considerations	28
3 Thermal Metrology	29
3.1 Characterizing Cooling Performance Requirements	29
3.1.1 Example	31
3.2 Processor Thermal Solution Performance Assessment	31
3.3 Local Ambient Temperature Measurement Guidelines	32
3.4 Processor Case Temperature Measurement Guidelines	34
4 Thermal Management Logic and Thermal Monitor Feature	35
4.1 Processor Power Dissipation	35
4.2 Thermal Monitor Implementation	35
4.2.1 PROCHOT# Signal	36
4.2.2 Thermal Control Circuit	36
4.2.2.1 Thermal Monitor	36
4.2.2.2 Thermal Monitor 2 (TM2)	37
4.2.3 Operation and Configuration	38
4.2.4 On-Demand Mode	39
4.2.5 System Considerations	39
4.2.6 Operating System and Application Software Considerations	40
4.2.7 THERMTRIP# Signal	40
4.2.8 Cooling System Failure Warning	40
4.2.9 Digital Thermal Sensor	41
4.2.10 Platform Environmental Control Interface (PECI)	42
5 Intel® Thermal/Mechanical Reference Design Information	43
5.1 ATX Reference Design Requirements	43
5.2 Validation Results for Reference Design	45
5.2.1 Heatsink Performance	45
5.2.2 Acoustics	46
5.2.3 Altitude	47
5.2.4 Reference Heatsink Thermal Validation	47
5.2.5 Fan Performance for Active Heatsink Thermal Solution	48
5.3 Environmental Reliability Testing	49
5.3.1 Structural Reliability Testing	49
5.3.1.1 Random Vibration Test Procedure	49
5.3.1.2 Shock Test Procedure	49
5.3.2 Power Cycling	51
5.3.3 Recommended BIOS/Processor/Memory Test Procedures	51
5.4 Material and Recycling Requirements	51
5.5 Safety Requirements	52
5.6 Geometric Envelope for Intel® Reference ATX Thermal Mechanical Design	52
5.7 Reference Attach Mechanism	53
5.7.1 Structural Design Strategy	53
5.7.2 Mechanical Interface to the Reference Attach Mechanism	54
6 Intel® Quiet System Technology (Intel® QST)	57
6.1 Intel® Quiet System Technology Algorithm	57
6.1.1 Output Weighting Matrix	58
6.1.2 Proportional-Integral-Derivative (PID)	58
6.2 Board and System Implementation of Intel® Quiet System Technology	60
6.3 Intel® QST Configuration and Tuning	62