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2.11 Electrical Considerations
2.11.1 Power Consumption
Table 46 lists voltage and current measurements for a computer that contains the D815EGEW
board and the following:
•
1.20 GHz Intel Pentium III processor with a 256 KB cache and a 133 MHz system bus
frequency
•
256 MB SDRAM
•
3.5-inch diskette drive
•
4.3 GB ATA-33 IDE hard disk drive
•
IDE CD-ROM drive
This information is provided only as a guide for calculating approximate power usage with
additional resources added.
Values for the Windows 98 ME desktop mode are measured at 640 x 480 x 256 colors and 60 Hz
refresh rate. AC watts are measured with the computer is connected to a typical 200 W power
supply, at nominal input voltage and frequency, with a true RMS wattmeter at the line input.
✏
NOTE
Actual system power consumption depends upon system configuration. The power supply should
comply with the recommendations found in the ATX Form Factor Specification document (see
Table 3 on page 17 for specification information).
Table 46 lists the power usage for a D815EGEW board with the configuration listed above and
including the optional onboard LAN subsystem. Table 47 lists the S3 state standby current values.
Table 46.
Power Usage for a D815EGEW Board
Mode
Windows 98 SE ACPI S0
Windows 98 SE ACPI S1
Windows 98 SE ACPI S3
Windows 98 SE ACPI S5
Table 47.
S3 State Standby Current
Configuration
USB and PS/2 powered by VCC
USB powered by +5V standby
PS/2 powered by +5V standby
USB and PS/2 powered by +5V standby
AC Power
+3.3 V
+5 V
50 W
2.46 A
2.79 A
45 W
2.34 A
2.74 A
3 W
0 A
0 A
3 W
0 A
0 A
Wake from USB
enabled?
No
Yes
No
Yes
Technical Reference
DC Current at:
+12 V
-12 V
+5 V (standby)
0.26 A
0 A
Dependent on S3
support
0.26 A
0 A
configuration.
0 A
0 A
Refer to Table 47
0 A
0 A
for values.
Standby Current
Wake from PS/2
in S3 State
enabled?
Typical
No
1013 mA
No
1018 mA
Yes
1313 mA
Yes
1318 mA
Maximum
1664 mA
2172 mA
2009 mA
2517 mA
67
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