Intel SC5299UP SC5299UPNA Manual De Usuario

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. 

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