Development Board Features
Development Kit User’s Manual
43
Table 14. Digital Multi-Meter Comparison
EXAMPLE SYSTEM
Sense Resistor Value:
0.002
Ω
Voltage Difference Across Resistor:
1.492 mV (746 mA)
Calculated Power:
1.113 mW
Agilent 34401A (6 ½ digit display)
Fluke 79 (3 digit display)
Specification:
(±0.0030% of reading)
+ (±0.0030% of range)
Specification:
±0.09% ±2 digits
Min Voltage Displayed:
Calculated Power:
1.49193 mV
1.1129 mW
Min Voltage Displayed:
Calculated Power:
1.47 mV
1.08 mW
Max Voltage Displayed:
Calculated Power:
1.49206 mV
1.1131 mW
Max Voltage Displayed:
Calculated Power:
1.51 mV
1.14 mW
Error in Power:
±0.009%
Error in Power:
±0.3%
As
2
Table 14
shows the precision achieved by using a high precision digital multi-meter
versus a standard digital multi-meter is ~33 times more accurate.
2
Table 15
summarizes all the power measurement sense resistors located on the
board. All sense resistors are 0.002
Ω
unless otherwise noted. Reference designators
marked with an asterisk are “not stuffed” on the board.
Table 15. System Voltage Rails
Component/
Interface
Voltage
Plane
Supply Rail
Reference
Designator
CPU VR
5 V
+V5S
+V5S_IMVP6
R1B3
CPU VR
Battery
+VBAT
+VDC_PHASE
R1P6
CPU VR
1.05 V
6262_PHASE1
+VCC_CORE
R3D1
CPU VR
1.05 V
6262_PHASE2
+VCC_CORE
R2D1
CPU
1.05 V
+V1.05S
+V1.05S_CPU
R3U1* & R3F1*
CPU
1.5 V
+V1.5S
+VCCA_PROC
R3T6 (0.01
Ω
)
GMCH VR
Battery
+VBATA
1.05S_VIN
R4G3
GMCH VR
Battery
+VBATA
1.05M_VIN
R4V10
GMCH VR
Battery
+VBAT
GVR_VBAT
R3V1
GMCH VR
5 V
+V5S
+V5S_GVR
R3F5
GMCH VR
3.3 V
+V3.3S_TVDAC
+V3.3S_A_TV_DAC
R4U1
GMCH VR
1.05 V
51124_LL2_L
+V1.05M
R4F2
