Intel ATX12VO - Introduction; Power Supplies and Alternative Low Power Mode; System Power Telemetry Feature; Processor Configurations

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Contents
1 Introduction .................................................................................................... 11
1.1 Power Supplies and Alternative Low Power Mode ...................................... 11
1.2 System Power Telemetry Feature ............................................................ 12
1.3 References ........................................................................................... 12
1.4 Terminology ......................................................................................... 13
2 Processor Configurations .................................................................................. 16
2.1 Processor Configurations (Recommended) ............................................... 16
2.2 High End Desktop Market Processor Considerations ................................... 16
2.2.1 Modular Power Supply Connectors ............................................. 17
2.2.2 Overclocking Recommendations ................................................ 18
3 PCI Express* Add-in Card Considerations ........................................................... 19
3.1 PCIe* Add-in Card Power Excursions ....................................................... 19
3.1.1 PCIe* Add-in-Card and PSU Power Budgets ................................ 21
3.1.2 PSU Power Excursion ............................................................... 23
3.2 PCIe* AIC Auxiliary Power Connectors ..................................................... 24
3.3 PCIe* Add-in-Card Auxiliary Power Connectors Sideband Signals ................ 25
3.3.1 Sense1 / Sense0 (Required) ..................................................... 25
3.3.2 CARD_PWR_STABLE (Optional) ................................................. 26
3.3.3 CARD_CBL_PRES# (Optional) ................................................... 27
3.3.4 Sideband Signals DC Specifications (Required) ............................ 28
4 Electrical ........................................................................................................ 29
4.1 AC Input – REQUIRED ........................................................................... 29
4.1.1 Input Over Current Protection (Required) ................................... 29
4.1.2 Inrush Current (Required) ........................................................ 29
4.1.3 Input Under Voltage (Required) ................................................. 29
4.2 DC Output (Required) ............................................................................ 30
4.2.1 DC Voltage Regulation (Required) .............................................. 30
4.2.2 DC Output Current (Required) ................................................... 30
4.2.3 Remote Sensing (Optional) ....................................................... 31
4.2.4 Other Low Power System Requirements (Required) ..................... 31
4.2.5 Output Ripple Noise (Required) ................................................. 32
4.2.6 Capacitive Load (Recommended) ............................................... 33
4.2.7 Closed Loop Stability (Required) ................................................ 33
4.2.8 Multiple 12V Rail Power Sequencing (Required) ........................... 34
4.2.9 Voltage Hold-Up Time (Required) .............................................. 34
4.3 Timing, Housekeeping, and Control (Required) ......................................... 34
4.3.1 PWR_OK (Required) ................................................................. 35
4.3.2 PS_ON# (Required) ................................................................. 35
4.3.3 +12VSB (Required).................................................................. 37
4.3.4 Power-On Time (Required)........................................................ 38
4.3.5 Rise Time (Required) ............................................................... 38
4.3.6 Overshoot at Turn-On / Turn-Off (Required) ............................... 39
4.3.7 I_PSU% Signal (Required) ........................................................ 39
4.4 Reset After Shutdown ............................................................................ 44
4.4.1 +12VSB at Power-Down (Required) ........................................... 44
4.4.2 +12VSB Fall Time (Recommended) ............................................ 44