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CP6930-1 User Guide
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6.1.3.3
Tolerance
The tolerance of the voltage lines is described in the CompactPCI specification (PICMG 2.0 R3.0). The recommended mea-
surement point for the voltage is the CompactPCI connector on the switch.
The following table provides information regarding the required characteristics for each board input voltage.
The output voltage overshoot generated during the application (load changes) or during the removal of the input voltage
must be less than 5% of the nominal value. No voltage of reverse polarity may be present on any output during turn-on or
turn-off.
6.1.3.4
Regulation
The power supply shall be unconditionally stable under line, load, unload and transient load conditions including capaci-
tive loads. The operation of the power supply must be consistent even without the minimum load on all output lines.
6.2
Power Consumption
Typical idle and maximum traffic (all ports, maximum speed) conditions power values were measured.
Table 6-2:
Input Voltage Characteristics
Voltage
Nominal Value
Tolerance
Maxi. Ripple (p-p)
Remarks
5 V
+5.0 VDC
+5%/-3%
50 mV
Main Voltage
3.3 V
+3.3 VDC
+5%/-3%
50 mV
-
VI/O (PCI) Voltage
+3.3 VDC or +5 VDC
+5%/-3%
50 mV
-
GND
Ground, not directly connected to potential earth (PE)
WARNING
All of the input voltages must be functionally coupled to each other so that
if one input voltage fails, the other input voltages must be regulated pro-
portionately to the failed voltage. For example, if the +5V begins to
decrease, +3.3V must decrease accordingly. This is required in order to pre-
clude cross currents within the CP6930-1.
Failure to comply with above may result in damage to the board or improper
system operation.
Note...
If the main power input is switched off, the supply voltages will not go to 0V instantly. It
will take a couple of seconds until the capacitors are discharged. If the voltage rises again
before it has gone below a certain level, the circuits may enter a latch-up state where
even a hard RESET will not help any more. The system must be switched off for at least 3
seconds before it may be switched on again. If problems still occur, turn off the main
power for 30 seconds before turning it on again.
Note...
The power consumption values indicated in the tables below can vary depending on the
ambient temperature or the system performance. This can result in deviations of the
power consumption values of up to 10%.
