
Intel
®
Atom™ Processor E660 with Intel
®
Platform Controller Hub EG20T Development Kit
January 2012
User Manual
Document Number: 324213-002
31
Power Management
3.0
Power Management
3.1
Power Measurement Support
The development kit has power measurement for each IO circuit and device validation.
Power measurement resistors are provided to measure the power on many of the
subsystems.
lists the measurement resistors.
Note:
Intel recommends that larger (~10 m
Ω
) resistors be stuffed for greater accuracy.
Power on a particular subsystem is calculated using the following formula:
Equation 1. P = V
2
/R
R = value of the sense resistor (typically 0.01
Ω
)
V = the voltage difference measured across the sense resistor.
Use a high precision digital multi-meter tool such as the Agilent 34401A digital multi-
meter.
for a comparison of a high-precision, digital multi-meter (Agilent
34401A) versus a precision, digital multi-meter (Fluke 79).
Table 8.
Power Measurement Resistors
Feature
Resistor-1
Resistor-2
Resistor-3
Tolerance
1%
1%
5%
Value
10 m
Ω
10 m
Ω
2 m
Ω
Watt
0.5W
0.75W
2W
Package Size (inch)
0805
1206
2512