24 PPC11A 6U VME Single Board Computer
Publication No. PPC11A-HRM/1
3 •
Installation and Power Up/Reset
Review the
section before installing the PPC11A. The following
notices also apply:
CAUTION
Consult the enclosure documentation to ensure that the PPC11A’s power requirements are compatible with
those supplied by the backplane.
3.1
Power Supply Requirements
The PPC11A can only operate from a 5V main supply input.
The PPC11A does not use the op3.3V power pins on the J1 connector.
The PPC11A does not require the +12V and -12V supplies for operation, but these
supply the ±12V pins of the mezzanine sites.
The +5VSTDBY supply may be used to power the Real-Time Clock in isolation, to
maintain the time/date information, when the PPC11A is powered down. This
requires up to 1 µA at n5V (4.88V to 5.25V).
3.2
Board Installation Notes
1.
The VME specification allows for a variety of different backplane pinouts
depending on the I/O configuration selected. Ensure that the PPC11A pinout
matches that of the backplane slot before insertion.
2.
Air-cooled versions of the PPC11A have injector/ejector handles to ensure that
the backplane connectors mate properly with the backplane. The captive screws
at the top and bottom of the front panel allow the board to be tightly secured in
position, which provides continuity with the chassis ground of the system.
3.
Conduction-cooled versions of the PPC11A have screw-driven wedgelocks to
provide the necessary mechanical/thermal interface. Correct adjustment requires
a calibrated torque wrench with a hexagonal head of size 2.5 mm, set to between
0.8 and 1.0 Nm (0.9 Nm/8 in-lb recommended).
4.
In an air-cooled development enclosure, when taking I/O connections from the
backplane connectors, use of Abaco I/O modules (or some equivalent system)
ensures optimum operation of the PPC11A regarding EMI. See the I/O Modules
manual for more details.
LINK
I/O Modules Hardware Reference Manual, publication number RT5154.