Specification When Dts Value Is Greater Than Tcontrol; Thermal Solution Performance - Intel Core i7-800 Specifications

7.2.2 Specification When DTS value is Greater than T
The product specification provides a table of Ψ
DTS = -1 as a function of T
points, a linear interpolation can be done for any DTS value reported by the processor.
A copy of the specification is provided as a reference in
The fan speed control algorithm has enough information using only the DTS value and
T
AMBIENT
part on the thermal profile.
As an example the data in
required Ψ
required Ψ
thermal solution.
In the prior thermal specifications this region, DTS values greater than T
defined by the processor thermal profile. This required the user to estimate the
processor power and case temperature. Neither of these two data points are accessible
in real time for the fan speed control system. As a result the designer had to assume
the worst case T
Figure 7-3.

Thermal solution Performance

50
AMBIENT
to command the thermal solution to provide just enough cooling to keep the
Table 7-1
at 25, 30, 35, and 40°C T
CA
, which means lower fan speeds and reduced acoustics from the processor
CA
and drive the fans to accommodate that boundary condition.
AMBIENT
0.700
0.650
0.600
0.550
0.500
0.450
0.400
0.350
0.300
TTV Ψ_ca @
DTS = Tcontrol
Sensor Based Thermal Specification Design Guidance
values at DTS = T
CA
(inlet to heatsink). Between these two defined
Table 7-1
has been plotted in Figure 7-3
. The lower the ambient, the higher the
AMBIENT
TTV Ψ_ca @
Thermal/Mechanical Specifications and Design Guidelines
CONTROL
and
CONTROL
of Section 7.6.
to show the
, was
CONTROL
Ta = 40 °C
Ta = 35 °C
Ta = 30 °C
Ta = 25 °C
DTS = -1