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ATX电源接口线序定义

ATX电源简介

  ATX电源作用是把交流220V的电源转换为计算机内部使用的直流5V,12V的电源。

  ATX电源的特点:与AT电源相比,ATX电源增加了“+3.3V、+5VSB、PS-ON

  其中“+3.3V”输出主要是供内存用,而“+5VSB”、“PS-ON”输出则体现了ATX电源的特点。

ATX电源最主要的特点就是:它不采用传统的市电开关来控制电源是否工作,而是采用“+5VSB、PS-ON”的组合来实现电源的开启和关闭,只要控制“PS-ON”信号电平的变化,就能控制电源的开启和关闭。“PS-ON”小于1V伏时开启电源,大于4.5伏时关闭电源。和AT电源不一样,ATX电源除了在线路上作了一些改进,其中最重要的区别是,关机时ATX电源本身并没有彻底断电,而是维持了一个比较微弱的电流。同时它利用这一电流增加了一个电源管理功能,称为Stand-By。它可以让操作系统直接对电源进行管理。通过此功能,用户就可以直接通过操作系统实现软关机,而且还可以实现网络化的电源管理。如在电脑关闭时,可以通过网络发出信号到电脑的Modem上,然后监控电路就会发出一个ATX电源所特有的+5VSB激活电压,来打开电源启动电脑,从而实现远程开机。

下面是ATX接口的详细线序图:

24-pin ATX12V 2.x

24p

Color Signal Pin Pin Signal Color
Orange +3.3 V 1 13 +3.3 V Orange
+3.3 V sense Brown
Orange +3.3 V 2 14 -12 V Blue
Black Ground 3 15 Ground Black
Red +5 V 4 16 Power on Green
Black Ground 5 17 Ground Black
Red +5 V 6 18 Ground Black
Black Ground 7 19 Ground Black
Grey Power good 8 20 -5V White
Purple +5 V standby 9 21 +5 V Red
Yellow +12 V 10 22 +5 V Red
Yellow +12 V 11 23 +5 V Red
Orange +3.3 V 12 24 Ground Black

20-pin ATX connector omits the last four pin: 11, 12, 23, 24)

Pins 8, 13, and 16 are control signals:

  • “Power On” is pulled up to +5V by the PSU, and must be driven low to turn on the PSU.
  • “Power good” is low when other outputs have not yet reached, or are about to leave, correct voltages.
  • “+3.3 V sense” line is for remote sensing of the voltage drop in the power supply wiring (should be connected to the +3.3 V on the motherboard)

“+5 V standby” supplies power even when the rest of the supply lines are off.

Pin 20 (-5V, white) is absent in current power supplies; it was optional in ATX and ATX12V ver. 1.2, and deleted as of ver. 1.3.

ATX Aux Power Cable

aux

Pin Color Function
1 Black Ground
2 Black Ground
3 Black Ground
4 Orange +3.3 V
5 Orange +3.3 V
6 Red +5 V

ATX 4pin +12V Power Cable

4

Color Function Pin Pin Function Color
Black Ground 1 3 +12 V Yellow
Black Ground 2 4 +12 V Yellow

ATX 8pin EPS +12V Power Cable

8

Color Function Pin Pin Function Color
Black Ground 1 5 +12 V Yellow
Black Ground 2 6 +12 V Yellow
Black Ground 3 7 +12 V Yellow
Black Ground 4 8 +12 V Yellow

你可以把一个8pin的EPS线缆插到一个4pin 12V的主板上。
你也可以把一个4pin 12V的电源线插到一个8pin EPS主板连接器上,但是不能保证它能正常工作。

6/8pin PCI Express Power Cable

68_1

Color Function Pin Pin Function Color
Yellow +12 V 1 5 Ground Black
Yellow +12 V 2 6 Ground Black
Yellow +12 V 3 7 Ground Black
Black Ground 4 8 Ground Black

6p 引脚连接器最大输出功率:75w
8p 引脚连接器最大输出功率:150 W

ATX Tolerance

Volt Tolerance Range Ripple max
+5 VDC ±5% (±0.25 V) +4.75 V to +5.25 V 50 mV
-5 VDC ±10% (±0.50 V) -4.50 V to -5.50 V 50 mV
+12 VDC ±5% (±0.60 V) +11.40 V to +12.60 V 120 mV
-12 VDC ±10% (±1.2 V) -10.8 V to -13.2 V 120 mV
+3.3 VDC ±5% (±0.165 V) +3.135 V to +3.465 V 50 mV
+5 VSB ±5% (±0.25 V) +4.75 V to +5.25 V 50 mV

D型电源头

4201045380.jpg

Color Function Pin
Yellow +12 V 1
Black Ground 2
Black Ground 3
Red +5 V 4