Standby Current Requirements - Intel D850MVSE Specification

Intel Desktop Board D850MD/D850MV 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 D850MD and D850MV boards may lose register settings
stored in memory, etc. Calculate the standby current requirements using the steps described
below.
Power supplies used with the D850MD and D850MV boards must be able to provide enough
standby current to support the Instantly Available (ACPI S3 sleep state) configuration as outlined
in Table 51 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 51 and review the following steps.
1. Note the total standby current required for the D850MD or D850MV board.
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 51.

Standby Current Requirements

Instantly Available Current
Support (Estimated for
Integrated Board Components)
Instantly Available Standby
Current Support
Estimated for add-on
components
Add to Instantly Available
total current requirement
(See instructions above)
Note: Dependent upon system configuration
80
Description
Total for D850MD board
(Note)
PS/2 ports
PCI 2.2 slots (wake enabled)
PCI 2.2 slots (non–wake enabled)
(Note)
CNR
(Note)
USB ports
Standby Current
Requirements (mA)
375
345
375
20
375
500