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CN4: ATX Power Supply Connector
CN4 is a 20-pin ATX Power Supply Connector. The pin
assignments are listed as below:
PIN
11
12
13
14
15
16
17
18
19
20
3.14
Description
3.3V
-12V
GND
PS-ON
GND
GND
GND
-5V
+5V
+5V
PIN
1
2
3
4
5
6
7
8
9
10
Description
3.3V
3.3V
GND
+5V
GND
+5V
GND
Power good
5VSB
+12V
External Switches and Indicators
There are several external switches and indicators for monitoring
and controlling your CPU board. All functions are in the CN27
connector.
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CN27 Connector
Function
SPEAKER
RESET
HDD LED
POWER LED
Power Button
PIN
2
4
6
8
10
12
9
11
1
3
5
7
21
Description
SPK
Jump for
Buzzer
SIGNAL
BuzzerNC
VCC
RESET
GROUND
IDE_LED+
IDE_LEDLED+
LED- (GROUND)
GROUND
PSON