Technical Product Specification

Power Sub-system Intel® Server System SC5650HCBRP TPS
Revision 1.2
Intel order number E81443-002
90
4.2.4.2 PSKILL
The purpose of the PSKill pin is to allow for hot swapping of the power supply. The mating pin of
this signal on the cage input connector is tied to ground, and its resistance is less than 5 ohms.
4.2.4.3 PWOK (Power OK) Input and Output Signals
PWOK is a power OK signal and will be 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 within current limit.
Table 54. 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=200μA 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 100μsec
Power down delay: T
pwok_off
1ms 200msec
4.2.4.4 SMBAlert#
The SMBAlert# 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 55. 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 μA 5.25 V
Sink current, Alert# = low 4 mA