Technical Reference

2.11 Electrical Considerations

2.11.1Add-in Board Considerations

The board is designed to provide 2 A (average) of +5 V current for an add-in board in the PCI slot.

2.11.2Power Consumption

Table 35 lists voltage and current specifications for a computer that contains the board and the following:

∙550E MHz Intel Pentium III processor with a 256 KB cache

∙256 MB SDRAM

∙6.2 GB IDE hard disk drive

∙Toshiba Mobile 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 desktop mode are measured at 640 x 480 x 256 colors and 60 Hz refresh rate. AC watts are measured with a typical 145 W power supply, nominal input voltage and frequency, with true RMS wattmeter at the line input.

Table 35. Power Usage

 

 

 

 

DC Amps at:

 

 

Mode

AC Watts

+3.3 V

+5 V

 

+12 V

-12 V

+5 VSB

Windows 98 ACPI S0

46 W

1.90 A

2.23 A

 

0.2 A

-0.02 A

0.17 A

 

 

 

 

 

 

 

 

Windows 98 ACPI S1

22 W

1.37 A

0.38 A

 

0.2 A

-0.02 A

0.143 A

 

 

 

 

 

 

 

 

Windows 98 ACPI S3

1 W

0.0 A

0.0 A

 

0.0 A

0.0 A

0.13 A

 

 

 

 

 

 

 

 

Windows 98 ACPI S5

1 W

0.0 A

0.0 A

 

0.0 A

0.0 A

0.11 A

 

 

 

 

 

 

 

 

53