©2004 Inova Computers GmbH
Page 1-21
Doc. PD00941013.001
ICP-CM
Product Overview
CompactPCI
®
1
1.51 Thermal Considerations
Being a passively-cooled design, a purpose-built, thermally optimized heat-sink is all that removes
the heat from the CPU. The effective surface area of the radiator unit mounted on the single slot
(4HP) CPU version is less that of the 8HP CPU and therefore, necessitates more airflow (or air
circulation) to keep it cool. As a guideline, the figures published in table 1.51 show the minimum
airflow required to maintain stable operation. As the ambient temperature surrounding the CPU
increases, so the airflow must increase.
Conclusions that can be drawn from this table are:
A
Single-slot CPUs should not be integrated in applications where the environmental temp. ex-
ceeds 65
°
C
A
CPUs intended for use in applications running at high operational temperatures ~ 85
°
C should
be clocked at 600MHz. At greater speeds, the volume of air required to cool the core
becomes so great that conventional cooling fans cannot be used.
Table 1.51 ICP-CM Airflow Requirements
Note:
If the ambient temperature is greater
than 50
°
C, systems utilizing the benefit of
this Celeron M CPU cannot operate with
a standard hard-disk, floppy or CD-ROM
etc.
Frequency
8HP
4HP
8HP
4HP
8HP
4HP
8HP
4HP
600MHz
without
forced
cooling
0.15
m/s
0.4
m/s
0.5
m/s
0.5
m/s
0.6
m/s
0.75
m/s
1300MHz
0.35
m/s
0.55
m/s
0.6
m/s
0.75
m/s
Key:
Not recommended
Ambient Air Temperature
≤
55
°
C
≤
65
°
C
≤
85
°
C
≤
75
°
C