Intel 2ND GENERATION CORE PROCESSOR FAMILY DESKTOP - THERMAL MECHANICAL S AND DESIGN GUIDELINES 01-2011, Технические характеристики

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Thermal/Mechanical Specifications and Design Guidelines 71
Sensor Based Thermal Specification Design Guidance
8.4.2 Fan Speed Control Algorithm with T
AMBIENT
Data
In a system where the FSC algorithm has access to the T
AMBIENT
information and is
capable of using the data the benefits of the DTS thermal specification become more
striking.
As will be demonstrated below, there is still over cooling of the processor, even when
compared to a nominally ambient aware thermal solution equipped with a thermistor.
An example of these thermal solutions are the RCFH7-1156 (DHA-A) or the boxed
processor thermal solutions. This over cooling translates into acoustic margin that can
be used in the overall system acoustic budget.
In this example the following assumptions are made:
• T
AMBIENT
= 35 °C
• The same Thermal Solution designed / validated to a 40 °C environment as used in
the example in Section 8.4.1
• T
CONTROL
= -20
• FSC device has access to T
AMBIENT
data
• Reference processor thermal solution (RCFH7-1156 (DHA-A))
• Below T
CONTROL
the fan speed is slowed down as in prior products
For a processor specification based on a T
CASE
thermal profile, when the DTS value is
equal to or greater than T
CONTROL
, the fan speed is accelerated to maximum fan speed
for the T
AMBIENT
as controlled by the thermistor in thermal solution. For the RCFH7-
1156 (DHA-A), this would be about 2150 RPM at 35 °C. This is graphically displayed as
the dashed line in
Figure 8-7 .
Figure 8-6. Fan Response Without T
AMBIENT
Data