Intel ERP2U manual Pwok Power OK, Pwok Signal Characteristics

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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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Contents SSI Disclaimer Contents Agency Requirements TablesConceptual Overview PurposeRequired Definitions/Terms/AcronymsRequired Optional Mechanical OverviewRecommended Optional Chassis Mounting FeaturesAirflow Requirements OptionalRedundant AC Inlets Temperature RequirementsAC Inlet Connector AC Input RequirementsAC Input Rating AC Input Voltage SpecificationOutput Minimum Power Efficiency EfficiencyAC Line Dropout AC Line FuseAC Inrush AC Line Surge Transient Performance AC Line Transient SpecificationAC Line Fast Transient Specification AC Line Sag Transient PerformanceOptional Processor Power Connector DC Output SpecificationOutput Connectors Required Baseboard power connectorP9 Floppy Power Connector Required Peripheral Power ConnectorsRequired Floppy Power Connector Peripheral Power ConnectorsRemote Sense Optional Server Signal ConnectorServer Signal Connector Grounding480 W Load Ratings Output Power/Currents350 W Load Ratings Voltage Minimum Continuous Maximum Continuous PeakVoltage Regulation Standby OutputsVoltage Regulation Limits Transient Load Requirements Dynamic LoadingCapacitive Loading Ripple / Noise+3.3 +12 +5 VSB RedundancyHot Swap Requirements Ripple and NoiseSSI Timing Requirements Output Voltage TimingDescription Recommended Description Turn On/Off TimingTurn On/Off Timing Over Current Protection Protection CircuitsCurrent Limit 240VA ProtectionOutput Voltage Over Temperature ProtectionOver Voltage Protection Over Voltage LimitsPSON# Control and Indicator FunctionsPson # Signal Characteristic Signal Type Pwok delayPwok Signal Characteristics Pwok Power OKProduct Info Area Field Replacement Unit FRU SignalsSMBus Communication Module FRU Data Module FRU Data FormatField Name PS Info Field Information Definition MultiRecord AreaLED Indicators LED IndicatorsPower Supply LEDs 10Agency Requirements Mtbf