CP302
Introduction
ID 21112, Rev. 05
Page 1 - 10
®
PEP Modular Computers GmbH
1.6.1
Temperature Range
The CP302 family are the first CompactPCI boards capable of operating over the
extended temperature range from -40°C up to + 85°C. All onboard components are
specially selected for the higher temperature range. For the higher temperatures the
desktop processors are not suitable, because the power consumption is higher and the
allowable case temperature is lower. The only suitable processor is the Intel
Mobile
Pentium
IIl processor family. These processors are produced with the new 0.18-micron
process which have lower power consumption and support higher case temperatures
(100°C).
1.6.1.1 Temperature Range and Air Flow
These values have been measured with typical applications under DOS and Windows
NT 4.0. In worst case situations the values and the temperature range must be reduced
accordingly. For all situations the maximum case temperature of the Mobile Pentium III
processor must be below 100°C. This temperature value can be measured with the
onboard remote temperature sensor. In instances of overtemperature the hardware
monitor will reduce the processor clock to lower the generated power
.
0 m/s air flow means standard convection cooling with the board in an upright position.
An airflow of 1 m/s is a typical value for a standard PEP ASM 4 rack ( 3U CompactPCI
rack with 1U cooling fans ). For other racks or housings the available airflow will be dif-
ferent. The maximum ambient temperature must be recalculated and / or measured for
such environments. For the calculation of the maximum ambient temperature the pro-
cessor case temperature must never exceed 100°C. The maximum heatsink tempera-
ture depends on the physical characteristics of the heatsink and thermal connection to
the processor. To ensure that the heatsink temperature does not exceed its limits an air-
flow may be needed for a given ambient temperature. Heatsink temperature is mea-
sured at the top of the heatsink base, closest to the processor.
Important Warning concerning overheating follows on next page
Table 1-5: Typical Temperature Range and Required Air Flow
Heat Sink
Version
Range
400 MHz
500 MHz
700 MHz
4HP
0°C - 60°C
0 m/s
0 m/s
0.2 m/s
-25°C - 75°C
0 m/s
0.6 m/s
--
-40°C - 85°C
0.6 m/s
--
--
8HP
0°C - 60°C
0 m/s
0 m/s
0 m/s
-25°C - 75°C
0 m/s
0 m/s
1.0 m/s
-40°C - 85°C
0 m/s
--
--
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