Fan Speed Control Algorithm With Tambient Data - Intel 2ND GENERATION CORE PROCESSOR FAMILY DESKTOP - THERMAL MECHANICAL SPECIFICATIONS AND DESIGN GUIDELINES 01-2011 Specifications

Sensor Based Thermal Specification Design Guidance
Figure 8-6. Fan Response Without T
8.4.2 Fan Speed Control Algorithm with T
In a system where the FSC algorithm has access to the T
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
• The same Thermal Solution designed / validated to a 40 °C environment as used in
the example in
• T
CONTROL
• FSC device has access to T
• Reference processor thermal solution (RCFH7-1156 (DHA-A))
• Below T
For a processor specification based on a T
equal to or greater than T
for the T
AMBIENT
1156 (DHA-A), this would be about 2150 RPM at 35 °C. This is graphically displayed as
the dashed line in
Thermal/Mechanical Specifications and Design Guidelines
AMBIENT
= 35 °C
Section 8.4.1
= -20
AMBIENT
the fan speed is slowed down as in prior products
CONTROL
, the fan speed is accelerated to maximum fan speed
CONTROL
as controlled by the thermistor in thermal solution. For the RCFH7-
Figure 8-7.
Data
AMBIENT
AMBIENT
data
thermal profile, when the DTS value is
CASE
Data
information and is
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