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814256 V
ERSION
2 F
EBRUARY
2006
2-7
PMC Module
Power
Considerations
The Compact CHAMP-AV IV supplies 5V, 3.3V, VIO, +12V, and -12V power to the PMC sites.
According to the PMC specification, the maximum power dissipation allowed for each PMC
site is 7.5 Watts (see Table 2.4). The Compact CHAMP-AV IV is designed to follow this
specification and in some cases, exceed it. Other combinations of PMCs (i.e. an 8 Watt PMC
on Site 1, a 7 Watt PMC on Site 2) may be possible.
The PMC VIO voltage can be factory configured for 5V or 3.3V signaling. Please consult the
user’s manual for the PMC that will be installed on the baseboard to determine the VIO
voltage necessary.
Caution
Please consult CWCEC technical support before installing a PMC that exceeds the 7.5 Watt
PMC standard to determine if it can be safely supported in your specific application and
configuration. Depending on the particular application and configuration, various conditions
can occur that could adversely affect (and possibly damage) the baseboard, PMC(s), or
chassis. These conditions include, but are not limited to: excessive current drawn from the
cPCI connectors, excessive heating of baseboard and PMC components, and reduction in
board voltages that can cause board resets to occur. Factors affecting this include, but are
not limited to: maximum operating temperature of the board (air temperature for air-cooled
boards and card edge temperature for conduction-cooled boards), airflow (air-cooled
boards), baseboard power dissipation (application specific), total PMC current drawn by
both PMC sites from each power supply rail, and the location and density of the hot
components on the PMC(s) and/or the baseboard.
T
ABLE
2.4:
Recommended Maximum Supply Current per PMC Site
Supply
Maximum Supply Current
5 V
1.5 A
3.3 V
2.3 A
+12 V
500 mA
-12 V
100 mA
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