Cabling; Power Delivery Considerations; Table 3: J20 Main Power Connector Pinout - VersaLogic BayCat VL-EPM-31ECP Hardware Reference Manual

C
ABLING
An adapter cable, part number CBR-1008, is available for connecting the EPM-31 to an ATX
power supply.
If your application requires a custom cable, the following information will be useful:
P D
OWER ELIVERY
Using the VersaLogic approved power supply (VL-PS200-ATX) and power cable (VL-CBR-
1008) ensures high quality power delivery to the board. Customers who design their own power
delivery methods should take into consideration the guidelines below to ensure good power
connections.
In addition, the specifications for typical operating current do not include any off-board power
usage that may be fed through the main power connector. Expansion boards and USB devices
plugged into the board will source additional power through the main power connector.

Do not use wire smaller than 22 AWG. Use high quality UL 1007 compliant stranded
wire.

The length of the wire should not exceed 18 inches.

Avoid using any additional connectors in the power delivery system.

The power and ground leads should be twisted together, or as close together as possible
to reduce lead inductance.

A separate conductor must be used for each of the power pins.

All power input pins and all ground pins must be independently connected between the
power source and the power connector.

Use a high quality power supply that can supply a stable voltage while reacting to widely
varying current draws.
Refer to Table 17: PCI/104-Plus Connector (PCI) Maximum Current on page 55 for information
on the current ratings for the PCI/104-Plus connector.
EPM-31 Hardware Reference Manual

Table 3: J20 Main Power Connector Pinout

Pin Signal
1 Ground
3 Ground
5 Ground
7 +3.3 VDC
9 Ground
EPM-31 Board Connector
FCI 78207-110HLF
C
ONSIDERATIONS
Pin Signal
2 +5 VDC
4 +12 VDC
6 -12 VDC
8 +5 VDC
10 +5 VDC
Mating Connector
FCI 69176-010LF
Board Features
25