Intel C2518 FH8065501516710 Data Sheet
Product codes
FH8065501516710
Intel
®
Atom™ Processor C2000 Product Family for Microserver
September 2014
Datasheet, Vol. 2 of 3
Order Number: 330061-002US
421
Volume 2—SMBus 2.0 Unit 2 - PECI—C2000 Product Family
CPU Thermal and Power Optimization Capabilities
17.9.7
Temperature Target Read (Index = 16)
The Temperature Target Read allows the PECI host to access the maximum Processor
Junction Temperature (T
J
-
MAX
) in degrees Celsius. This is also the default temperature
value at which the processor thermal control circuit activates. The T
J
-
MAX
value may vary
from processor part to part to reflect manufacturing process variations.
The Temperature Target read also returns the processor T
CONTROL
value. The T
CONTROL
is
returned in standard PECI temperature format and represents the threshold
temperature used by the thermal management system for fan speed control.
See
.
17.9.8
Thermal Averaging Constant Write/Read (Index = 21)
This feature allows the PECI host to control the window over which the estimated
processor PECI temperature is filtered. The host may configure this window as a power
of two. As an example, programming a value of 5 results in a filtering window of 25 or
32 samples. The maximum programmable value is 8 or 256 samples. Programming a
value of zero disables the PECI temperature-averaging feature. The default value of the
thermal averaging constant is 4 which translates to an averaging window size of 24 or
16 samples.
See
. Additional details on the PECI temperature filtering function can be
found in
.
Figure 17-20.Temperature Target Read
Reserved
Processor T
J-MAX
(°C)
T
CONTROL
(°C)
31
24 23
16 15
8 7
0
Reserved
Figure 17-21.Thermal Averaging Constant Read/Write
0
3
4
Reserved
31
PECI Temperature Averaging Constant