Standby Current Requirements - Intel D850EMD2 Product Manual

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 Table 4 and follow the steps outlined below:
1. Note the total Desktop Board D850EMD2 or D850EMV2 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 (non-wake-enabled) row, the total of the number of
non-wake-enabled devices installed (PCI and AGP) multiplied by the standby current
requirement.
5. Add all additional wake-enabled devices' and non-wake-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.

Standby Current Requirements

Instantly Available Current
Support
Estimate for integrated board
components
Estimate for add-on components
(Add to integrated board components
shown above)
®
* Refer to the Intel Desktop Board D850EMV2/D850EMD2 Technical Product Specification for the exact standby current
requirements
** Dependent upon system configuration
✏
NOTE
PCI requirements are calculated by totaling the following:
•
One wake-enabled device @ 375 mA
•
Five non-wake-enabled devices @ 20 mA each
PS/2 Ports requirements per the IBM PS/2 Port Specification (Sept 1991):
•
Keyboard @ 275 mA
•
Mouse @ 70 mA
USB requirements are calculated by totaling the following:
•
One wake-enabled device @ 500 mA
•
USB hub @ 100 mA
•
Three USB non-wake-enabled devices @ 2.5 mA each
•
The USB ports are limited to a combined total of 700 mA
Description
Total for the Desktop Board D850EMD2 or
D850EMV2
**
PS/2 ports
PCI 2.2 slots (wake-enabled)
PCI 2.2 slots (non-wake-enabled)
CNR** (wake enabled)
CNR** (non-wake enabled)
**
USB ports
Desktop Board Features
Standby Current
Requirements (mA)
770*
345
375
100
875
40
700
19