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DS2900 Datasheet(PDF) 2 Page - Emerson Network Power |
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DS2900 Datasheet(HTML) 2 Page - Emerson Network Power |
2 / 4 page Rev. 11.9.09_44 DS2900 2 of 4 Embedded Power for Business-Critical Continuity Logic Control Remote ON/OFF (PSON#) The PSON# signal is required to remotely turn on/off the power supply. PSON# is an active low signal that turns on the +12VDC power rail. When this signal is not pulled low by the system, or left open, the +12VDC output turns off. The 3.30Vsb output remains on. This signal is pulled to a stanby voltage by a pull-up resistor internal to the power supply. The power supply fan(s) shall operate at the lowest speed Table 1 PSON# Signal Characteristics Power Good (PWOK#) PWOK# is a power good signal and will be pulled LOW by the power supply to indicate that both the outputs are above the regulation limits of the power supply. When an 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 de-asserted to a HIGH state. The start of the PWOK# delay time shall be inhibited as long as the +12VDC output is in current limit or the 3.30VSB output is below the regulation limit. Table 2 PWOK# Signal Characteristics Power Supply Present Indicator (PRESENT#) The PRESENT# signal is primarily used to provide a mechanism by which the host system can sense the number of power supplies physically present (operational or not). This pin is connected to ground in the power supply. AC Input Present Indicator (ACOK#) The AC OK# signal is used to indicate presence of AC input to the power supply. This signal shall be connected to 3.3 Vsb through a resistor on the host system side. A logic “Low” level on this signal shall indicate AC input to the power supply is present. A Logic “HIgh” on this signal shall indiciate a loss of AC input to the power supply. Table 3 ACOK# Signal Characteristics Signal Type Accepts an open collector/drain input from the system. Pulled-up to the 3.30Vsb located in the power supply PSON# = Low ON PSON# = Open OFF MIN MAX Logic level low (power supply ON) 0 V 0.8 V Logic level high (power supply OFF) 2.0 V 4.125 V Source Current, Vpson = low 4 mA Power up delay: Tpson on delay 5 msec 400 msec Signal Type: Open collector/drain output from power supply. Pull-up to 3.30Vsb external to the power supply PWOK = High Power not good PWOK = Low Power Good MIN MAX Logic level low voltage, Isink = 4 mA 0 V 0.8 V Logic level high voltage, Isource = 200 A 2.0 V 4.125 V Sink current, PWOK = low 4 mA Source current, PWOK = high 2 mA PWOK delay: Tpwok on 100 ms 1000 ms PWOK rise and fall time 100 sec Power down delay: Tpwok off 1 ms 1000 msec Signal Type Pull-up to 3.30Vsb through a resitor in the host system PRESENT# = Low Present PRESENT# = High Not Present |
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