Power Management
3Power Management
3.1Power Measurement Support
Power measurement resistors are provided to measure the power on many of the subsystems.
Table 5. Power Measurement Resistor
Feature | Value |
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Tolerance | 1% |
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Value | 10 mΩ |
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NOTE: Intel recommends that larger (~10 mΩ) 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
Table 6. Digital Multi-Meter Comparison
Example System
Sense Resistor Value | 0.01 Ω |
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Voltage Difference Across Resistor | 1.492 mV (149.2 mA) |
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Calculated Power | 0.223 mW |
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User’s Manual | 21 |
Document Number: 320264