Avago Technologies MegaRAID SAS 8204ELP - Manual (Page 62)

3-18 MegaRAID SAS RAID Controller Characteristics
Copyright © 2007 by LSI Corporation. All rights reserved.
3.3.4 Electrical Characteristics
This subsection provides the power supply requirements for the
MegaRAID 1078-based SAS RAID controllers.
3.3.4.1 Power Supply Requirements for the SAS 8704ELP and SAS 8708ELP RAID
Controllers
All power is supplied to the SAS 8704ELP and the SAS 8708ELP RAID
controllers through the PCI Express 3.3V rails and the 12V rail. Onboard
switching regulator circuitry operating from the 3.3V rails and the 12V rail
provide the necessary voltages. The following states determine the
typical current consumption of the controller:
•
State 1: During a hard reset
•
State 2: During a disk stress test
•
State 3: While sitting idle at the DOS prompt
The supply voltages are 12V ± 8 percent (from PCI edge connector only)
and 3.3V ± - 9 percent (from PCI edge connector only).
Table 3.9 lists
the power supply for the RAID controller for each of the three states at
the different voltages.
Table 3.9 Power Supply for the SAS 8704ELP and the SAS
8708ELP RAID Controllers
Note: +12V is used in the charging circuitry for the battery pack
on the optional iBBU battery-backed daughter card. If the
BBU daughter card is mounted, the following power
consumption figures apply:
1. The Self Monitoring Analysis and Reporting Technology (SMART) detects
up to 70 percent of all predictable disk drive failures. In addition, SMART
monitors the internal performance of all motors, heads, and drive
electronics.
PCI Edge Connector State 1 State 2 State 3
3.3V supply 330mA 330mA 330mA
+12V supply 1.00A 1.81A 1.53A
3.3V auxiliary supply 30mA 30mA 30mA