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(AT) Motherboard Power

P8

Pin
Name
 
Color
Description
1 PG
 
Orange Power Good, +5 VDC when all voltages has stabilized.
2 +5V
 
Red +5 VDC (or n/c)
3 +12V
 
Yellow +12 VDC
4 -12V
 
Blue -12 VDC
5 GND
 
Black Ground
6 GND
 
Black Ground

P9

Pin
Name
 
Color
Description
1 GND
 
Black Ground
2 GND
 
Black Ground
3 -5V
 
White or Yellow -5 VDC
4 +5V
 
Red +5 VDC
5 +5V
 
Red +5 VDC
6 +5V
 
Red +5 VDC

 

(ATX) Motherboard Power

Pin Signal 18 AWG Wire
11

11

+3.3 VDC +/-4%

3.3V sense +/-4%

Orange(22AWG)

Brown(22AWG)

12 -12V DC +/-12% Blue
13 COM Black
14 PS-ON Green
15 COM Black
16 COM Black
17 COM Black
18 -5V DC +/-5% White
19 +5V DC +/-5% Red
20 +5V DC +/-5% Red

 
 
Pin Signal 18 AWG Wire
1 +3.3V +/-4% Orange
2 +3.3V DC +/-4% Orange
3 COM Black
4 +5V DC +/- 5% Red
5 COM Black
6 +5V DC +/- 5% Red
7 COM Black
8 PW-OK Gray
9 +5V SB +/- 5% Purple
10 +12V DC +/-5% Yellow

 

PS-ON PS-ON is an active low signal (Green-Pin 14) that turns on all of the main power rails. When this signal is held high or open circuit by the motherboard, the power rail outputs should not deliver current and should be at ground potential. Power should be delivered only if PS-ON is held at ground.

5V SB 5V SB is a standby voltage (Purple-Pin 9) that may be used to power circuits during power down state. Eg. Soft power control.

PW-OK PW-OK is a power good signal (Gray-Pin 8) and should be held high by the power supply to indicate that the +5Vdc and +3.3Vdc outputs are above the undervoltage thresholds of the power supply.



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