CP605
System Considerations
ID 25095, Rev. 07
© 2004 Kontron Modular Computers GmbH
Page 6 - 9
2509
5.07.UG.VC.041005/14244
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The following table specifies the ranges for the different input power voltages within which the
board is functional. The CP605 is not guaranteed to function if the board is not operated within
the prescribed limits.
6.2.2
Backplane
Backplanes to be used with the CP605 must be adequately specified. The backplane must pro-
vide optimal power distribution for the +3.3V and the +5V power inputs. It is recommended to
use only backplanes which have two power planes for each voltage.
Input power connections to the backplane itself should be carefully specified to ensure a mini-
mum of power loss and to guarantee operational stability. Long input lines, under dimensioned
cabling or bridges, high resistance connections, etc. must be avoided. It is recommended to
use POSITRONIC or M-type connector backplanes and power supplies where possible.
6.2.3
Power Supply Units
Power supplies must be specified with enough reserve for the remaining system components.
In order to guarantee a stable functionality of the system, it is recommended to provide more
power than the system requires. An industrial power supply unit should be able to provide at
least twice as much power as the entire system requires. An ATX power supply unit should be
able to provide at least three times as much power as the entire system requires.
As the design of the CP605 has been optimized for minimal power consumption, the power
supply unit shall be stable even without minimum load.
Where possible, power supplies which support voltage sensing should be used. Depending on
the system configuration this may require an appropriate backplane. The power supply should
be sufficient to allow for die resistance variations.
Table 6-2: DC Operational Input Voltage Ranges
INPUT SUPPLY VOLTAGE
ABSOLUTE RANGE
RECOMMENDED RANGE
+3.3 V
3.2 V min. to 3.47 V max.
3.3 V min. to 3.47 V max.
+5 V
4.85 V min. to 5.25 V max.
5.0 V min. to 5.25 V max.
+12 V
11.4 V min. to 12.6 V max.
—
-12 V
-11.4 V min. to -12.6 V max.
—
Note ...
Due to the high power consumption of the Pentium 4 Desktop processor
(especially the 2.4 GHz version) it is strongly recommended to use a higher
input voltage on the 5 V and 3.3 V lines.
For the Mobile Pentium 4 there is no such limitation.
Note ...
Non-industrial ATX PSUs require a greater minimum load than a single CP605
is capable of creating. When a PSU of this type is used, it will not power up
correctly and the CP605 may hang up. The solution is to use an industrial PSU
or to add more load to the system.
