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Board Features
VL-EPU-3311 Reference Manual
23
Table 4: Main Power Connector Pinout
Pin
Signal
Description
Pin
Signal
Description
1
V_MAIN
Main input voltage
(+8V to +17V)
2
V_MAIN
Main input voltage
(+8V to +17V)
3
EARTH_GND
Earth ground
4
V_MAIN
Main input voltage
(+8V to +17V)
5
POWER_FAULT
An open-drain signal
•
Low if power is OK
•
Open if there is a
power fault (a fault
can also simply be
the power is off)
6
GND
Signal ground
7
GND
Signal ground
8
GND
Signal ground
Cabling
An adapter cable, part number VL-CBR-0809, is available for connecting the Osprey to an ATX
power supply.
If your application requires a custom cable, the following information will be useful:
VL-EPU-3311 Board Connector
Mating Connector
Molex 055959-0830
Molex 051353-0800
Power Requirements
The Osprey requires a 8 - 17 VDC supply capable of providing at least 35 W average
power that can also provide a peak power of 50 W. The input DC supply creates both the
standby and payload voltages provided to the CPU module.
The exact power requirements for the Osprey depend on several factors, including CPU
configuration (the number of cores, CPU clock rate), memory configuration, peripheral
connections, and attached devices, and others. For example, driving long RS-232 lines at high
speed can increase power demand.
The VersaLogic VL-PS-ATX12-300A is a 1U size ATX power supply suitable for use with the
Osprey. Use the VL-CBR-0809 adapter cable to attach the power supply to the main power
connector.
Power Delivery Considerations
Using the VersaLogic approved power supply (VL-PS-ATX12-300A) and power cable
(VL-CBR-0809) will ensure 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.
Also, the specifications for typical operating current do not include any off-board power usage
that may be fed through the Osprey power connector. Expansion boards and USB devices
plugged into the board will source additional power through the Osprey power connector.
Do not use wire smaller than 22 AWG. Use high quality UL 1007 compliant stranded wire.