Venus User Manual Rev 1.1e
www.diamondsystems.com
Page 13
3.1.18 Power Supply
The board will operate with an input voltage in the range 9VDC to 18VDC. Nominal input voltage is +12VDC.
Typical operating power consumption is in the range of 13-14W (1.1-1.2A at 12V).
The supports ACPI for pushbutton on/off control and also supports standby mode. In standby mode, the board
may be powered on via the Wake on Lan feature or using a power button.
All required supply voltages for
any installed expansion modules and LCDs are provided by the board’s power
supply. When sizing a power supply to drive Venus, care should be taken to ensure that the supply can provide
enough current for all installed options. The figures below are the design limits of the board. When converting the
lower voltage current to main 12V input current, an 85% efficiency factor should be used.
12V
5V
3.3V Feature
1.0A
2.0A
2.0A
PCI-104 and One Bank modules
3.0A
PCIe Minicard add-on modules
0.25A
SATA disk module
1.4A
0.7A
LCD power
1.1A
LCD backlight
0.05A
Utility connector
1.0A
USB 2.0 ports
3.6A
USB 3.0 port
The +5V and +3.3V pins of the PCI-104 connector and PCIe/104 connector are tied together. The +12V pins from
PCI-104 connector are routed directly to the power connector such that the board can be powered over a PCI-104
power module. Maximum allowable reflected ripple, measured at the voltage input connector is 120mV p-p.
NOTE: Since the PCI-104 connector 12V pins are tied directly to the main input voltage, if a PCI-104
module that requires 12VDC is installed, the main input voltage must be 12VDC.