Thermally Significant Components; Table 2-4 Thermally Significant Components - SMART Embedded Computing MVME7100ET Installation And Use Manual

2.3.4

Thermally Significant Components

The following table summarizes components that exhibit significant temperature rises.
These 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
2-1 and Figure
of these components.
The preferred measurement location for a component may be junction, case, or ambient as
specified in the table below. 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 2-4
Reference
Designator
U27, U4
U25, U26, U28
U22
U24
U10, U11, U12,
U13, U14, U56,
U57, U58, U59,
U6, U60, U61,
U62, U63, U64,
U7, U8, U9
U20
MVME7100ET Single Board Computer Installation and Use (6806800K87G)
2-2. Versions of the board that are not fully populated may not contain some
Thermally Significant Components
Generic Description
Gb Ethernet Transceiver
PCI-X/PCI-Express
Bridge
PCI-Express Bridge
VME Bridge
DDR2 SDRAM
MPU
Hardware Preparation and Installation
Maximum Allowable
Component
Temperature
105°C
85°C
115°C
90°C
95°C
105°C
Figure
Measurement
Location
Ambient
Junction
Ambient
Junction
Case
Junction
33