Standby Current Requirements - Intel D845HV Product Manual

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CAUTION

If the standby current necessary to support multiple wake events from the PCI and/or USB buses

exceeds power supply capacity, the desktop board may lose register settings stored in memory.

Power supplies used with this board must be able to provide enough standby current to support the

standard Instantly Available (ACPI S3 sleep state) configuration as outlined in Table 4. Values are

determined by specifications such as PCI 2.2. Actual measurements may vary.

To estimate the total amount of standby current required for a particular system configuration,

standby current requirements of all installed components must be added. Refer to the descriptions

in and follow the steps outlined below:

1. Note the total D845HV or D845WN board standby current requirement.

2. Add to that the total PS/2 port standby current requirement if a wake-enabled device is

connected.

3. Add, from the PCI 2.2 slots (wake-enabled) row, the total of the number of wake-enabled

devices installed (PCI and AGP) multiplied by the standby current requirement.

4. Add, from the PCI 2.2 slots (nonwake-enabled) row, the total of the number of wake-enabled

devices installed (PCI and AGP) multiplied by the standby current requirement.

5. Add all additional wake-enabled devices' and nonwake-enabled devices' standby current

requirements as applicable.

6. Add all the required current totals from steps 1 through 5 to determine the total estimated

standby current power supply requirement.

Table 4.