Rev. 7.10.09_81

HPS3000 Series

6 of 7

Embedded Power for

Business-Critical Continuity

PWOK#(PowerGood)

PWOK#isapowergoodsignalandwillbepulledLOWbythepowersupplytoindicatethatboththe

outputsareabovetheregulationlimitsofthepowersupply.Whenanyoutputvoltagefallsbelow

regulationlimitsorwhenACpowerhasbeenremovedforatimesufficientlylongsothatpowersupply

operationisnolongerguaranteed,PWOKwillbede-assertedtoaHIGHstate.ThestartofthePWOK#

delaytimeshallbeinhibitedaslongasthe48Voutputisincurrentlimitorthe5Vsboutputisbelow

theregulationlimit.

PowerSupplyPresentIndicator(PRESENT#)

ThePRESENT#signalisprimarilyusedtoprovideamechanismbywhichthehostsystemcansensethe

numberofpowersuppliesphysicallypresent(operationalornot).Thispinisconnectedtogroundinthe

power supply.

ACINPUTPresentIndicator(ACOK#)

TheACOK#signalisusedtoindicatepresenceofACinputtothepowersupply.Thissignalshallbe

connectedto5Vsbthrougharesistoronthehostsystemside.Alogic“Low”levelonthissignalshall

indicateACinputtothepowersupplyispresent.ALogic“High”onthissignalshallindicatealossofAC

inputtothepowersupply.

Table12

ACOK#SignalCharacteristics

SignalType

Pull-upto5Vsbthrougharesistorinthehost

system.

PRESENT#=Low

Present

PRESENT#=High

Notpresent

MIN

MAX

Logiclevellowvoltage,Ising=4mA

0V

0.8V

Logiclevelhighvoltage,Isink=50µA

2.0V

4.80V

Sinkcurrent,PRESENT#=Low

4mA

Sourcecurrent,PRESENT#=High

50µA

PSON#SignalCharacteristic

SignalType

Opencollector/drainoutputfrompower

supply.Pullupto5Vsbexternaltothepower

supply.

PWOK=High

ON

PWOK=LOW

OFF

MIN

MAX

Logiclevellowvoltage,Isink=4mA

0V

0.8V

Logiclevelhighvoltage,Isource=200µA

2.0V

4.80V

Sinkcurrent,PWOK=low

4mA

Sourcecurrent,PWOK=high

2mA

100msec

1000msec

PWOKriseandfalltime

100µsec

1msec

1000msec