SSI America ERP2U Control and Indicator Functions, Pson#, Pson # = Low Pson # = Open or High

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SSI

ERP2U Power Supply Design Guide, V2.31

8Control and Indicator Functions

The following sections define the input and output signals from the power supply. Signals that can be defined as low true use the following convention:

signal# = low true

8.1PSON#

STATUS

Required

The PSON# signal is required to remotely turn on/off the power supply. PSON# is an active low signal that turns on the +3.3 V, +5 V, +12 V, and -12 V power rails. When this signal is not pulled low by the system, or left open, the outputs (except the +5 VSB and Vbias) turn off. This signal is pulled to a standby voltage by a pull-up resistor internal to the power supply. Refer to Figure 4 for timing diagram.

 

Table 29: PSON# Signal Characteristic

 

Signal Type

 

Accepts an open collector/drain input from the system.

 

Pull-up to VSB located in power supply.

 

 

 

 

 

 

PSON# = Low

 

ON

 

PSON# = Open or High

OFF

 

 

 

MIN

MAX

Logic level low (power supply ON)

0 V

1.0 V

 

 

Logic level high (power supply OFF)

2.0 V

5.25 V

 

 

Source current, Vpson = low

 

4 mA

 

 

Power up delay:

Tpson_on_delay

5 ms

400 ms

 

 

PWOK delay:

T pson_pwok

 

50 ms

 

 

Disabled

Enabled

Hysteresis ≥ 0.3V and/or other de-bounce method

≤ 1.0 V

≥ 2.0 V

PS is

PS is

enabled

disabled

0V

1.0V

2.0V

5.25V

Figure 5: PSON# Signal Characteristics

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Contents SSI ERP2U Power Supply Design Guide Disclaimer Contents Error! Bookmark not defined TablesFRU Device Product Information Area Purpose Conceptual OverviewDefinitions/Terms/Acronyms RequiredMechanical Overview Required OptionalAcoustic Requirements Temperature RequirementsRecommended Acoustic Sound Power Levels Airflow RequirementsAC Input Requirements AC Inlet ConnectorAC Input Voltage Specification Redundant AC InletsAC Line Dropout Input Under VoltageEfficiency AC Input RatingAC Inrush AC Line Transient SpecificationAC Line Fuse AC Line Sag Transient PerformanceAC Line Fast Transient Specification AC Line Surge Transient PerformanceAC Line Surge Required Baseboard power connector DC Output SpecificationOutput Connectors P1 Baseboard Power ConnectorRequired Floppy Power Connector 2 +12V4 Baseboard Power ConnectorRequired Peripheral Power Connectors Peripheral Power ConnectorsFloppy Power Connector Serial ATA Power ConnectorServer Signal Connector Server Signal ConnectorRemote Sense Output Power/CurrentsGrounding 550 W Load Ratings600 W Load Ratings 650 W Load Ratings700 W Load Ratings 750 W Load RatingsStandby Outputs Fan operation in standby modeVoltage Regulation 800 W Load RatingsVoltage Regulation Limits Dynamic LoadingCapacitive Loading Transient Load RequirementsRipple / Noise Capacitve Loading ConditionsRipple and Noise Redundancy Hot Swap RequirementsTiming Requirements Output Voltage TimingDescription Turn On/Off Timing Recommended DescriptionTurn On/Off Timing 240VA Protection Protection CircuitsCurrent Limit Over Current ProtectionOver Voltage Limits Over Temperature ProtectionOver Voltage Protection Output VoltagePwok delay Control and Indicator FunctionsPson # Signal Characteristic Signal Type PSON#Pwok Signal Characteristics Pwok Power OKPower Supply Management Interface SMBus CommunicationProduct Info Area Field Replacement Unit FRU SignalsModule FRU Data Module FRU Data Format FRU Device InformationLED Indicators MultiRecord AreaField Name PS Info Field Information Definition LED Indicators Power Supply LEDsMtbf 10Agency Requirements

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