Standby Current Requirements - Intel BOXD850EMD2L - 850E 478PIN MAX-2GB UATX 3PCI Specifications

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Intel Desktop Board D850EMD2/D850EMV2 Technical Product Specification

2.11.3 Standby Current Requirements

CAUTION

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

exceeds power supply capacity, the desktop boards D850EMD2/D850EMV2 may lose register

settings stored in memory, etc. Calculate the standby current requirements using the steps

described below.

Power supplies used with the desktop boards D850EMD2/D850EMV2 must be able to provide

enough standby current to support the Instantly Available (ACPI S3 sleep state) configuration as

outlined in Table 53 below.

Values are determined by specifications such as PCI 2.2. Actual measured values may vary.

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

current requirements of all installed components must be added to determine the total standby

current requirement. Refer to the descriptions in Table 53 and review the following steps.

1. Note the total standby current required for the desktop boards D850EMD2/D850EMV2.

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 number of wake-enabled devices

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

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

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

5. Add the standby current requirements for all additional wake-enabled and non-wake-enabled

devices 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 53.