VIA Technologies, Inc.
VIA EPIA Mini-ITX Mainboard
Operation Guidelines
-7-
4. Connectors:
ITEM
FUNCTION
CN1
Audio Connector
CN2
COM Port Connector
CN3
USB Connector and RJ45 Connector
CN4
RCA Video or S/P DIF Jack
CN5
S-Video Jack
CN6
LPT Connector
CN7
CRT Connector
CN8
ATX Power Connector
CN9
PS/2 Keyboard Connector and mouse
Connector
IDE1,IDE2
On-board IDE Primary/Secondary
Connectors
FAN1,FAN2
FAN Connectors
5. Mini-ITX Power Supply
The Mini-ITX compliant power supply is designed with several space, energy and noise reduction
features in mind. The typical physical dimensions (see table below) are very compact compared to
other standard power supplies such as ATX. The options of AC 100 – 240V and 50 – 60Hz auto
switching are fully supported.
Power Supply
Length
Width
Height
Total Area %
smaller
iTX, Mini-ITX
174 mm
73mm
55 mm
ATX
140 mm
150 mm
86 mm
150%
The Mini-ITX power specification uses an industry standard 20-pin main connector to the power
supply as shown below.
1
+3V
11
+3V
2
+3V
12
NC
3
Gnd
13
Gnd
4
+5V
14
PWR_ON-
5
Gnd
15
Gnd
6
+5V
16
Gnd
7
Gnd
17
Gnd
8
PWR_GD
18
NC
9
5V_SB
19
+5V
10
+12V
20
+5V
Note: NC = no connection
1
2
3
4
5
6
7
8
9
11
12
13
14
17
18
19
20
10
