One Stop Systems, Inc. OSS-adaptPCI-PMC User Manual
Rev. A
8
Power Supply
5v power is always supplied from the PCI connector. The adaptPCI-PMC may get its 3.3v power from one of two sources, the PCI
bus, or the optional on-board 3.3v regulator which draws its power from PCI +5v. See
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.
When choosing to draw 3.3V power from the PCI Bus, dual jumper JP1A/B is installed, JP2 A/B is removed. This connects the 3.3V
PCI source voltage directly to the board's 3.3v plane.
The optional on-board 3.3v switching power supply is provided to draw 3.3v power from the 5.0v source that is provided by the PCI
Bus. When choosing this option jumper JP2A/B is installed and JP1A/B removed. With this option selected, 3.3 volts is supplied by
a LT1772B switching buck regulator and support components. The board is capable of supplying up to 12 Watts from the on-board
regulator.
Ground / Frame Ground connection
Zero Ohm Jumper R1 is provided as a means to connect Signal (Digital) Ground and Frame Ground. R1 is not installed in the
default configuration. In practice signal ground and frame ground are normally not connected. The user has the option to connect
the signal and frame grounds if needed by the application.
LEDs and test points
LEDs and test points are provided on the adaptPCI-PMC card to indicate status and to facilitate troubleshooting.
Power LEDs
Green Power Indication LEDS and test points are provided for –12V, +12V, 5V, 3.3V and VIO. The LEDs are located at the top
edge of the card above the PMC connectors and are clearly marked.
BUSMODE#1 LED
The BUSMODE#1 signal is connected to a green LED that lights when BUSMODE#1 is driven low to indicate that a PMC card is
present and PCI capable. A test point is also provided, directly above the BUSMODE#1 LED.
Ground test points
Two test points for ground are also provided. Both test points are located at the top edge of the board, one at the front (GND1), and
the other (GND2) at the rear of the card
Power test points
Power test points are provided directly above the associated power LED
Optional
3.3v
Power Supply
PCI bus
JP2
A
B
JP1
A B
Regulate
OSS-AdaptPCI-PMC
PCI bus
