Power Sub-system Intel
®
Entry Server Chassis SC5299-E TPS
Revision 3.1
Intel order number D37594-005
60
Table 68. PSKILL Signal Characteristics
Signal Type (Input Signal to Supply)
Accepts a ground input from the system. Pull-up to VSB
located in the power supply.
PSKILL = Low, PSON
#
= Low ON
PSKILL = Open, PSON
#
= Low or Open OFF
PSKILL = Low, PSON
#
= Open OFF
MIN MAX
Logic level low (power supply ON) 0V 1.0V
Logic level high (power supply OFF) 2.0V 5.25V
Source current, Vpskill = low 4mA
Delay from PSKILL=High to power supply
turned off (T
PSKill
)1
100 s
a. T
PSKill
is the time from the PSKill signal de-asserting HIGH to the power supply’s output inductor discharging.
2.3.5.3 PWOK (Power OK) Output Signal
PWOK is a power OK signal and is 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 de-asserted to a LOW state. The start
of the PWOK delay time is inhibited as long as any power supply output is in current limit.
Table 69. PWOK Signal Characteristics
Signal Type
Open collector/drain output from power supply. Pull-up
to VSB located in system.
PWOK = High Power OK
PWOK = Low Power Not OK
MIN MAX
Logic level low voltage, Isink=4mA 0 V 0.4 V
Logic level high voltage, Isource=200 A
2.4 V 5.25 V
Sink current, PWOK = low 4 mA
Source current, PWOK = high 2 mA
PWOK delay: T
pwok_on
100 ms 1000 ms
PWOK rise and fall time
100 s
Power down delay: T
pwok_off
1 ms 200 ms
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