Difference between revisions of "Template:ATX power connector"

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| colspan="6" style="font-size:75%; width: 350px"|''The three shaded pins (8, 13, and 16) are data signals, not power. "Power On" is used to power on the PSU (except the +5 standby connection). This connection is left open or held high (+5v) to keep the PSU off. It is grounded or held low to turn on the PSU. <br/>If the PSU is capable of handling the current load, "Power good" will be held high.  If the PSU cannot handle the current load or input voltages are too low, this line will be held low.<br/>The "+3.3 V sense" line is used to more accurately control the +3.3 line when under load. <ref>{{cite web |title=ATX Specification Version 2.1|url=http://www.formfactors.org/developer%5Cspecs%5Catx2_1.pdf}}</ref>''
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| colspan="6" style="font-size:75%; width: 350px"|''The three shaded pins (8, 13, and 16) are control signals, not power. "Power On" is [[Pull-up resistor|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. The "+3.3 V sense" line is for [[Four-terminal sensing|remote sensing]].<ref>{{cite web |title=ATX Specification Version 2.1|url=http://www.formfactors.org/developer%5Cspecs%5Catx2_1.pdf}}</ref>''
 
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| colspan="6" style="font-size:75%"|''Pin 20 used to provide −5VDC (white wire) in ATX and ATX12V<br/>versions 1.2 and earlier. Version 1.2 allowed the omission of <br/>this pin,and versions 1.3 and beyond prohibited this pin.''
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| colspan="6" style="font-size:75%; width: 350px"|''Pin 20 used to provide −5VDC (white wire) in ATX and ATX12V versions up to 1.2. It is optional in version 1.2, and missing in ver. 1.3 and up.''
 
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| colspan="6" style="font-size:75%"|''The right-hand pins are numbered 11 through 20 in the 20-pin version.''
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| colspan="6" style="font-size:75%; width: 350px"|''The right-hand pins are numbered 11 through 20 in the 20-pin version.''
 
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Revision as of 19:11, 2 June 2010

24-pin ATX12V 2.x power supply connector
(20-pin omits the last four: 11, 12, 23 and 24)
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 No connection
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
The three shaded pins (8, 13, and 16) are control signals, not power. "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. The "+3.3 V sense" line is for remote sensing.[1]
Pin 20 used to provide −5VDC (white wire) in ATX and ATX12V versions up to 1.2. It is optional in version 1.2, and missing in ver. 1.3 and up.
The right-hand pins are numbered 11 through 20 in the 20-pin version.
  1. "ATX Specification Version 2.1" (PDF).