Power Sub-system Intel
®
Entry Server Chassis SC5299-E TPS
Revision 3.1
Intel order number D37594-005
78
Table 94. 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 0V 0.4V
Logic level high voltage, Isource=200 A
2.4V 5.25V
Sink current, PWOK = low 4mA
Source current, PWOK = high 2mA
PWOK delay: T
pwok_on
100ms 1000ms
PWOK rise and fall time
100 sec
Power down delay: T
pwok_off
1ms 200msec
2.4.5.4 SMBAlert#
This signal indicates that the power supply is experiencing a problem that the user should
investigate. The signal may be asserted due to critical events or warning events.
The SMBAlert# signal will be asserted whenever there is at least one event condition in the
power supply or cage.
The SMBAlert# signal will automatically be cleared when the cause of the event is no longer
present.
Table 95. SMBAlert# Signal Characteristics
Signal Type (Active Low)
Open collector/drain output from power supply.
Pull-up to VSB located in system.
Alert# = High OK
Alert# = Low Power Alert to system
MIN MAX
Logic level low voltage, Isink=4 mA 0 V 0.4 V
Logic level high voltage, Isink=50 A 5.25 V
Sink current, Alert# = low 4 mA
Sink current, Alert# = high 50 A
Alert# rise and fall time 100 s
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