Motorola VME172PA-652SE module

                            Motorola VME172PA-652SE module

The Motorola MVME162 Embedded Controller is specified, designed, and

tested to operate reliably with an incoming air temperature range from 0° to

55° C (32° to 131° F) with forced air cooling at a velocity typically achievable

by using a 100 CFM axial fan. Temperature qualification is performed in a

standard Motorola VMEsystem 3000 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 VME

card cage. The incoming air temperature is measured between the fan

assembly and the card cage, where the incoming airstream first encounters the

controller under test. Test software is executed as the controller 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

and 490 LFM flowing over the controller. Less airflow is required to cool the

controller in environments having lower maximum ambients. Under more

favorable thermal conditions, it may be possible to operate the controller

reliably at higher than 55° C with increased airflow. It is important to note that

there are several factors, in addition to the rated CFM of the air mover, which

determine the actual volume and speed of air flowing over the controller.

Special Considerations for Elevated Temperature Operation

The following information is for users whose applications for the MVME162

may subject it to high temperatures.

The MVME162 uses commercial grade devices. Therefore, it can operate in an

environment with ambient air temperatures from 0° C to 70° C. Several factors

influence the ambient temperature seen by components on the MVME162.

Among them are inlet air temperature; air flow characteristics; number, types,

and locations of IndustryPack (IP) modules; power dissipation of adjacent

boards in the system, etc.

A temperature profile of the MVME162-023 was developed in an MVME945

12-slot VME chassis. This board was loaded with one GreenSpring IP-Dual

P/T module (position a) and three GreenSpring IP-488 modules (positions b,

c, and d). One twenty-five-watt load board was installed adjacent to each side

of the board under test. The exit air velocity was approximately 200 LFM 

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