Table 2-3 Thermally Significant Components - Motorola CPCI-6115 Installation And Use Manual

Compactpci single board computer
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Thermal Requirements
This section provides systems integrators with information that can be used to conduct thermal
evaluations of the board in their specific system configuration. It identifies thermally significant
components and lists the corresponding maximum allowable component operating
temperatures. It also provides sample procedures for component-level temperature
measurements.
Table 2-3 on page 33
are the components that should be monitored in order to assess thermal performance. The
table also supplies the component reference designator and the maximum allowable operating
temperature.
You can find components on the board by their reference designators as shown in
on page
34. Versions of the board that are not fully populated may not contain some of these
components.
The preferred measurement location for a component may be junction, case or air as specified
in the table. Junction temperature refers to the temperature measured by an on-chip thermal
device. Case temperature refers to the temperature at the top, center surface of the component.
Air temperature refers to the ambient temperature near the component.

Table 2-3 Thermally Significant Components

Component Location
U40
U36
U32
U23, U89
U22
U159, U160
U146
U13, U14
U2-U10, U74-U82
U101, U102, U96
CPCI-6115 CompactPCI Single Board Computer Installation and Use (6806800A68D)
summarizes components that exhibit significant temperature rises. These
General Description
Ultra DMA PCI-IDE
21555BB PCI Bridge
MPC7457 Processor
DDR Clock Generator
MV64360
32 megabit flash
Clock Buffer
Cache
DDR SDRAM
Ethernet PHY
Hardware Preparation and Installation
Maximum
Measurement
Allowable
Location
Temperature
(Junction, Case or
(Degrees C)
Air)
70° C (158° F)
Air
70° C (158° F)
Air
103° C (217.4° F)
Case
85° C (185° F)
Air
110° C (230° F)
Case
85° C (185° F)
Air
105° C (221° F)
Case
115° C (239° F)
Case
70° C (158° F)
Air
120° C (248° F)
Case
Figure 2-1
33

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