EBX-22 Reference Manual
27
System Features
Power Supply
P
OWER
C
ONNECTORS
Main power is applied to the EBX-22 through an EPIC-style 10-pin polarized connector at
location J6.
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
J6
Pin
Signal
Name
Description
1
PS_ON
Soft Power Off
2 GND
Ground
3 GND
Ground
4 +12VDC Power
Input
5 +3.3VDC Power
Input
6 +5VSB 5V
Standby
7 +5VDC Power
Input
8 +5VDC Power
Input
9 -12VDC Power
Input
10 GND
Ground
Note
The +3.3VDC, +12VDC and -12VDC inputs on the main power connector are only
required for PC/104-
Plus
and PC/104 expansion modules that require these
voltages.
P
OWER
R
EQUIREMENTS
The EBX-22 requires only +5.0 volts (±5%) for proper operation. The voltage required for the
RS-232 ports and analog input sections are generated with a DC/DC converter. Low-voltage
supply circuits provide power to the CPU and other on-board devices.
The exact power requirement of the EBX-22 depends on several factors, including memory
configuration, CPU speed, peripheral connections, type and number of expansion modules and
attached devices. For example, PS/2 keyboards typically draw their power directly from the EBX-
22, and driving long RS-232 lines at high speed can increase power demand.
4
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