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2.5
Electrical Considerations
2.5.1
Power Supply Considerations
CAUTION
The +5 V standby line from 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.
Additional power required will depend on configurations chosen by the integrator.
The power supply must comply with the indicated parameters of the ATX form factor
specification.
•
The potential relation between 3.3 VDC and +5 VDC power rails
•
The current capability of the +5 VSB line
•
All timing parameters
•
All voltage tolerances
For example, for a system consisting of a D945GCLF2 board (with integrated Dual-
Core Intel Atom processor at 8 W), 2 GB DDR2 RAM, one hard disk drive, one optical
drive, and all board peripherals enabled, the minimum recommended power supply is
80 W. Table 22 lists the recommended power supply current values.
Table 22. Recommended Power Supply Current Values
Output Voltage
Current
2.5.2
Fan Header Current Capability
CAUTION
The GMCH must be connected to the GMCH fan header, not to a chassis fan header.
Connecting the GMCH fan to a chassis fan header may result in onboard component
damage that will halt fan operation.
Table 23 lists the current capability of the fan headers.
Table 23. Fan Header Current Capability
Fan Header
GMCH fan
Rear chassis fan
3.3 V
5 V
0.52 A
7.34 A
Maximum Available Current
2.0 A
1.0 A
Technical Reference
12 V1
12 V2
1.17 A
0.54 A
-12 V
5 VSB
0.03 A
0.25 A
51
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