VL-EPICs-36 Reference Manual
20
System Features
Power Supply
P
OWER
C
ONNECTORS
Main power is applied to the VL-EPICs-36 through an EPIC-style 10-pin polarized connector at
location J14.
Warning!
To prevent severe and possibly irreparable damage to the system, it is critical that
the power connectors are wired correctly. Make sure to use both +5VDC pins and
all ground pins to prevent excess voltage drop.
Table 4: Main Power Connector Pinout
J14
Pin
Signal
Name
Description
1
GND
Ground
2
GND
Ground
3
GND
Ground
4
+12VDC
Power Input
5
+3.3VDC
Power Input
6
NC
Not Connected
7
+5VDC
Power Input
8
+5VDC
Power Input
9
-12VDC
Power Input
10
GND
Ground
Note:
The +3.3VDC, +12VDC and -12VDC inputs are required only for expansion
modules that require these voltages.
P
OWER
R
EQUIREMENTS
The VL-EPICs-36 re5 volts (±5%) for proper operation. The higher voltages required for
the RS-232 ports are generated as needed on-board. Low-voltage supply circuits provide the
many power rails required by the CPU and other on-board devices.
The exact power requirement of the VL-EPICs-36 depends on several factors, including memory
configuration, CPU speed, peripheral connections, type and number of expansion modules and
attached devices. For example, driving long RS-232 lines at high speed can increase power
demand, and USB devices can draw considerable power depending on the device.
4
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