Cooling Requirements
http://www.motorola.com/computer/literature A-3
A
optional devices, refer to the documentation provided with
the device.
Cooling Requirements
The Motorola MBX series family of embedded controllers is specified,
designed, and tested to operate reliably with an incoming air temperature
range from 0° C to 70° C (32° F to 158° F) with forced air cooling of the
entire assembly (base board and expansion modules) at a velocity typically
achievable by using a 100 CFM axial fan.
Temperature qualification is performed in a Motorola development
chassis. Twenty-five–watt load boards are inserted in two card slots, one
on each side, adjacent to the board under test, to simulate a high power
density system configuration. An assembly of three axial fans, rated at
100 CFM per fan, is placed directly under the card cage. The incoming air
temperature is measured between the fan assembly and the card cage,
where the incoming airstream first encounters the module under test. Test
software is executed as the module is subjected to ambient temperature
variations. Case temperatures of critical, high power density integrated
circuits are monitored to ensure component vendors’ specifications are not
exceeded.
While the exact amount of airflow required for cooling depends on the
ambient air temperature and the type, number, and location of boards and
other heat sources, adequate cooling can usually be achieved with 10 CFM
Table A-3. Maximum Power Consumption for Each
PC/104-
Plus
Module
Supply Voltage Max. Current Max. Power
+3.3V (±10%) 3 A 10.8 W
+5V (±5%) 2 A 10.5 W
+12V (±5%) 1 A 12.6 W
−5V (±5%) 0.2 A 1.05 W
−12V (±5%) 0.3 A 3.78 W
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