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Intel ERP2U manual PWOK Power OK, PWOK Signal Characteristics

Models: ERP2U

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8.2PWOK (Power OK)

SSI

ERP2U Power Supply Design Guide, V1.0

8.2PWOK (Power OK)

STATUS

Required

PWOK is a power OK signal and will be pulled HIGH by the power supply to indicate that all the outputs are within the regulation limits of the power supply. When any output voltage falls below regulation limits or when AC power has been removed for a time sufficiently long so that power supply operation is no longer guaranteed, PWOK will be deasserted to a LOW state. See Figure 3 for a representation of the timing characteristics of PWOK. The start of the PWOK delay time shall be inhibited as long as any power supply output is in current limit.

Table 24: PWOK Signal Characteristics

	Signal Type	Open collector/drain output from power supply. Pull-up
	Signal Type	to VSB located in power supply.
		to VSB located in power supply.

	PWOK = High	Power OK
	PWOK = High
	PWOK = Low	Power Not OK
	PWOK = Low

	MIN	MAX
Logic level low voltage, Isink = 4 mA	0 V	0.4 V
Logic level low voltage, Isink = 4 mA
Logic level high voltage, Isource=200 μA	2.4 V	5.25 V
Logic level high voltage, Isource=200 μA
Sink current, PWOK = low		4 mA
Sink current, PWOK = low
Source current, PWOK = high		2 mA
Source current, PWOK = high
PWOK delay: Tpwok_on	200 ms	1000 ms
PWOK delay: Tpwok_on
PWOK rise and fall time		100 μs
PWOK rise and fall time
Power down delay: T pwok_off	1 ms	200 ms
Power down delay: T pwok_off

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Intel ERP2U manual PWOK Power OK, PWOK Signal Characteristics

Contents

Version ERP2U Entry Redundant Power 2U Power Supply Design GuideA Server System Infrastructure SSI Specification For 2U Rack Chassis Power SuppliesDisclaimer Definitions/Terms/Acronyms ContentsPurpose Conceptual OverviewAgency Requirements FiguresTables MTBF2 Conceptual Overview 1 Purpose3 Definitions/Terms/Acronyms 4 Mechanical Overview Required OptionalFigure 1 Enclosure Drawing Recommended 4.1 Optional Chassis Mounting Features4.2 Airflow Requirements Optional5.2 Redundant AC Inlets 4.3 Temperature Requirements5.1 AC Inlet Connector 5 AC Input Requirements63 Hz 5.3 AC Input Voltage Specification5.4 Efficiency 47 Hz5.5 AC Line Dropout 5.6 AC Line Fuse5.7 AC Inrush Table 5 AC Line Surge Transient Performance 5.8 AC Line Transient Specification5.9 AC Line Fast Transient Specification Table 4 AC Line Sag Transient Performance6.1.2 Optional Processor Power Connector 6 DC Output Specification6.1 Output Connectors 6.1.1 Required Baseboard power connectorTable 9 P9 Floppy Power Connector 6.1.3 Required Peripheral Power Connectors6.1.4 Required Floppy Power Connector Table 8 Peripheral Power Connectors6.1.5 Optional Server Signal Connector 6.2 Grounding6.3 Remote Sense 6.4 Output Power/Currents Table 11 350 W Load RatingsTable 12 480 W Load Ratings 6.4.1 Standby Outputs 6.5 Voltage RegulationTable 15 Transient Load Requirements 6.6 Dynamic Loading6.7 Capacitive Loading 6.8 Ripple / Noise6.9 Redundancy 6.10 Hot Swap RequirementsTable 17 Ripple and Noise DC connect at the same time as the module is inserted into the cage. No damage to the connector contacts shall occur. The module may power on or come up into standby mode 6.11 Timing Requirements Table 18 Output Voltage TimingFigure 2 Output Voltage Timing Table 19 Turn On/Off Timing Figure 3 Turn On/Off Timing 7 Protection Circuits 7.1 Current Limit7.2 240VA Protection Table 22 Over Voltage Limits 7.4 Over Temperature Protection7.3 Over Voltage Protection Table 21 Over Current Protection8.1 PSON# 8 Control and Indicator FunctionsTable 24 PWOK Signal Characteristics 8.2 PWOK Power OK8.3.3 Module FRU Data Format 8.3.1 Field Replacement Unit FRU Signals8.3 SMBus Communication 8.3.2 Module FRU Data8.3.3.2 MultiRecord Area Field Name PS InfoField Information Definition Power Supply LEDs 8.4 LED IndicatorsLED Indicators POWER SUPPLY CONDITION10Agency Requirements 9 MTBF