Intel IQ31244 user manual 1.2Electrical Specifications, 1.3Environmental Specifications

Intel® IQ31244 Customer Reference Board

1.2Electrical Specifications

The electrical specifications of the IQ31244 are given in Table 2.

Table 2. Intel® IQ31244 Customer Reference Board Power Requirements

Voltage	Current	Current
	(Typical)	(Maximum)
+3.3 V	3.19 Amps	4.56 Amps
+5 V	1.6 mAmps	2.28 mAmps
+12 V	0.0 Amps	0.0 Amps
-12 V	0.0 Amps	0.0 Amps

Most ATX power-supply units (PSUs) regulate off the 5 V signal. When no devices are drawing from the 5 V supply, the ATX PSU does not supply 3.3 V correctly to the motherboard. To compensate for this, it is recommended that a load (for example, an SATA hard drive) be added on the 5 V rail from the PSU.

Note: The included 300 W power supply is sufficient to power up to four drives at one time. An additional power supply is required to provide power for more than four drives. To estimate the required power supply, estimate that each SATA drive draws approximately 2.8 A on the 12 V supply.

1.2.1SATA Drive Enclosures

It is highly recommended that the SATA drives are housed in an enclosure to reduce the environmental noise that can affect performance. An example of a SATA four-drive enclosure is the DE400 model from Storcase*:

http://www.storcase.com/dataexpress/datasheet/dexpress_de400.pdf.

1.3Environmental Specifications

Table 3.	Environmental Specifications
		Characteristic	Range
		Operating temperatures	0–55 °C
		Relative humidity (non-condensing)	0–95%
		Storage temperatures	-55–125 °C

Note: A small amount of airflow is required to prevent the IQ31244 operating temperature from exceeding 55 °C. When the ATX chassis cover is removed, an external fan is required to provide adequate air flow within the chassis.

10 User’s Manual