Estimating Standby Current; Standby Current Requirements - Intel cc820 Product Manual

Estimating Standby Current

To estimate the amount of stand by current required for a particular system configuration:
1. From the PCI 2.2 row, determine the number of supported wake-enabled adapters required
(PCI and AGP) and multiply by 375 mA.
2. Determine the number of non-wake adapters and multiply by 20 mA.
3. Total the values derived from steps 1 and 2 and replace the PCI 2.2 value (currently 475 mA)
in the table with the new value.
4. Add the rows to the estimated standby current required to support Instantly Available
technology.
5. Add the current required to support the optional features.
6. Total the estimated standby current required to support Instantly Available technology and the
current required to support the optional features.
Table 5.

Standby Current Requirements

Instantly Available Current
Support (Estimated)
Optional Current Support
(Add to Instantly Available total.)
(See instructions above.)
* 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 CC820 desktop board
Description
AMR*
PS/2 Ports*
USB Ports*
Desktop Board Features
Current Requirements (mA)
695
Current Requirements (mA)
150
300
507.5 (max)
19