Intel D845HV Product Specification - Page 80

Fan Connector Current Capability, Power Supply Considerations

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Intel Desktop Board D845HV/D845WN Technical Product Specification  NOTE IBM PS/2 Port Specification (Sept 1991) states: • 275 mA for keyboard • 70 mA for the mouse (nonwake-enable device) PCI/AGP requirements are calculated by totaling the following: • One wake-enabled device @ 375 mA, plus • Five nonwake-enabled devices @ 20 mA each, plus USB requirements are calculated as: • One wake-enabled device @ 500 mA • USB hub @ 100 mA • Three USB nonwake-enabled devices connected @ 2.5 mA each  NOTE Both USB ports are capable of providing up to 500 mA during normal G0/S0 operation. Only one USB port will support up to 500 mA of stand-by-current (wake-enabled device) during G1/S3 suspended operation. The other port may provide up to 7.5 mA (three nonwake-enabled devices.) during G1/S3 suspended operation. 2.11.4 Fan Connector Current Capability Table 52 lists the current capability of the fan connectors on the D845HV and D845WN boards. Table 52. Fan Connector Current Capability Fan Connector Maximum Available Current Processor fan 1.20 A Front chassis fan (optional) 0.50 A Rear chassis fan 0.35 A 2.11.5 Power Supply Considerations CAUTION The +5 V standby line for the power supply must be capable of providing adequate +5 V standby current. Failure to do so can damage the power supply. The total amount of standby current required depends on the wake devices supported and manufacturing options. Refer to Section 2.11.3 on page 78 for additional information. System integrators should refer to the power usage values listed in Table 50 when selecting a power supply for use with the D845HV or D845WN boards. Measurements account only for current sourced by the D845HV or D845WN boards while running in idle modes of the started operating systems. Additional power required will depend on configurations chosen by the integrator. 80

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Intel Desktop Board D845HV/D845WN Technical Product Specification
80
NOTE
IBM PS/2 Port Specification (Sept 1991) states:
•
275 mA for keyboard
•
70 mA for the mouse (nonwake-enable device)
PCI/AGP requirements are calculated by totaling the following:
•
One wake-enabled device @ 375 mA, plus
•
Five nonwake-enabled devices @ 20 mA each, plus
USB requirements are calculated as:
•
One wake-enabled device @ 500 mA
•
USB hub @ 100 mA
•
Three USB nonwake-enabled devices connected @ 2.5 mA each
NOTE
Both USB ports are capable of providing up to 500 mA during normal G0/S0 operation.
Only one
USB port will support up to 500 mA of stand-by-current (wake-enabled device) during G1/S3
suspended operation.
The other port may provide up to 7.5 mA (three nonwake-enabled devices.)
during G1/S3 suspended operation.
2.11.4
Fan Connector Current Capability
Table 52 lists the current capability of the fan connectors on the D845HV and D845WN boards.
Table 52.
Fan Connector Current Capability
Fan Connector
Maximum Available Current
Processor fan
1.20 A
Front chassis fan (optional)
0.50 A
Rear chassis fan
0.35 A
2.11.5
Power Supply Considerations
CAUTION
The +5 V standby line for the power supply must be capable of providing adequate +5 V standby
current.
Failure to do so can damage the power supply.
The total amount of standby current
required depends on the wake devices supported and manufacturing options.
Refer to
Section 2.11.3 on page 78 for additional information.
System integrators should refer to the power usage values listed in Table 50 when selecting a
power supply for use with the D845HV or D845WN boards.
Measurements account only for current sourced by the D845HV or D845WN boards while running
in idle modes of the started operating systems.
Additional power required will depend on configurations chosen by the integrator.