Intel C2550 FH8065401488912 Data Sheet
Product codes
FH8065401488912
Intel
®
Atom™ Processor C2000 Product Family for Microserver
September 2014
Datasheet, Vol. 2 of 3
Order Number: 330061-002US
423
Volume 2—SMBus 2.0 Unit 2 - PECI—C2000 Product Family
CPU Thermal and Power Optimization Capabilities
17.9.11
Accumulated Energy Status Read (Index = 3)
This service can return the value of the total energy consumed by the entire processor
package or just the logic supplied by the VCC power plane as specified through the
parameter field in
. This information is tracked by a 32-bit
counter that wraps around and continues counting on reaching its limit. See
. Energy units for this read are determined as per the
Package Power SKU Unit settings described in
.
While Intel requires reading the accumulated energy data at least once every
16 seconds to ensure functional correctness, a more realistic polling rate
recommendation is once every 250 ms for better accuracy. In general, as the power
capability decreases, so will the minimum polling rate requirement. It is recommended
that you tune the polling rate to reduce the potential impact on other Power-
Management features.
To calculate the power, the following formula can be used:
Figure 17-23.Accumulated Energy Read Data
Accumulated CPU Energy
0
31
EnergyStatus( T
N
) - EnergyStatus( T
N-1
)
Power(watt) =
______________________________________
( T
N
-T
N-1
) * 2^energy_unit