Intel
®
Core
TM
2 Duo E6400, E4300, and Intel
®
Pentium
®
Dual-Core E2160 Processor
October 2007 TDG
Order Number: 315279 -003US 43
Intel® Quiet System Technology (Intel® QST)—Intel
®
Core
TM
2 Duo E6400, E4300, and Intel
®
Pentium
®
Dual-Core E2160 Processor
6.3 Intel
®
QST Configuration and Tuning
Initial configuration of the Intel QST is the responsibility of the board manufacturer. The
SPI flash should be programmed with the hardware configuration of the motherboard
and initial settings for fan control, fan monitoring, voltage and thermal monitoring. This
initial data is generated using the Intel provided Configuration Tool.
At the system integrator level, the Configuration Tool can be used again but this time to
tune the Intel QST subsystem to reflect the shipping system configuration. In the
tuning process, the Intel QST can be modified to have the proper relationships between
the installed fans and sensors in the shipping system. A Weighting Matrix Utility and
Intel QST Log program are planned to assist in optimizing the fan management and
achieve the acoustic goal.
See your Intel field sales representative for availability of these tools.
6.4 Fan Hub Thermistor and Intel
®
QST
There is no closed loop control between Intel QST and the thermistor, but they can
work in tandem to provide the maximum fan speed reduction. The BTX reference
design includes a thermistor on the fan hub. This Variable Speed Fan curve will
determine the maximum fan speed as a function of the inlet ambient temperature, and
by design, provides a Ψ
CA
sufficient to meet the thermal profile of the processor. Intel
QST, by measuring the processor Digital thermal sensor, will command the fan to
reduce speed below the VSF curve in response to processor workload. Conversely, if the
processor workload increases, the FSC will command the fan via the PWM duty cycle to
accelerate the fan up to the limit imposed by the VSF curve. Care needs to be taken in
BTX designs to ensure the fan speed at the minimum operating speed provides
sufficient air flow to support the other system components.
Figure 17. Digital Thermal Sensor and Thermistor
Fan Speed
(RPM)
Inlet Temperature (°C)
Full
Speed
30
38
Min.
Operating
Variable Speed Fan (VSF) Curve
Fan Speed
Operating Range
with FSC
34
Min %
Fan Speed
(% PWM Duty Cycle)
100 %
Fan Speed
(RPM)
Inlet Temperature (°C)
Full
Speed
30
38
Min.
Operating
Variable Speed Fan (VSF) Curve
Fan Speed
Operating Range
with FSC
34
Min %
Fan Speed
(% PWM Duty Cycle)
100 %
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