Ampro Corporation LITTLE BOARD P5X - Manual (Page 23)

Little Board/P5x Technical Manual
2–5
Most I/O connectors are shrouded dual-row male headers for use with flat ribbon (IDC) female
connectors and ribbon cable. Ampro recommends that you use “center-bump polarized” connectors
to prevent accidentally installing cables backwards. Use non-strain-relief connectors to stay within
the vertical height envelope shown in Figure 2– 1.
If you use the recommended mating connectors, you can install retaining clips to secure a cable to
its connector. (The connector heights of some brands do not allow the use of retaining clips.)
Retaining clips are especially useful in high-vibration environments.
You can also design a PC board assembly, made with female connectors in the same relative
positions as the Little Board’s connectors, to eliminate cables, meet packaging requirements, add
EMI filtering, or customize your installation in other ways. Precise dimensions for locating
connectors are provided in Figure 2– 1.
The ISA portion of the PC/104-Plus expansion bus appears on connector J1 (A, B, C, D). You can
expand the system with on-board MiniModule products or other PC/104-compliant expansion
modules. These modules stack directly on the connectors, or use conventional or custom expansion
hardware, including solutions available from Ampro.
The PCI portion of the PC/104-Plus expansion bus appears on connector J21. It uses a 2 mm. 4-row
connector called out in the PC/104-Plus draft specification. Like the J1 connectors, J21 has both
male and female connections, allowing for “stackthrough” assembly.
If you plan to use the on-board video controller with a flat-panel LCD screen requiring a Vee bias
voltage supply, you can install Ampro’s optional LCD Bias Supply board on connector J4. This
board can be jumpered to supply positive or negative Vee from ±15V to ±35V (adjustable). (Only
certain LCD panels require an external Vee supply.)