Intel SC5650BCDP User Manual

3.1.7.3 

PSON# Input Signal 

The PSON

#

 signal is required to remotely turn on/off the power supply. PSON

#

 is an active low 

signal that turns on the +3.3V, +5V, +12V, and -12V power rails. When this signal is not pulled 
low by the system, or left open, the outputs (except the +5VSB) turn off. This signal is pulled to 
a standby voltage by a pull-up resistor internal to the power supply. Refer to the following table 
and figure for PSON# signal characteristics. 

Signal Type 

Accepts an open collector/drain input from the system.  
Pull-up to 5V located in power supply. 

PSON

#

 = Low  

ON 

PSON

#

 = High or Open 

OFF 

 

Logic level low (power supply ON) 

0V 

1.0V 

Logic level high (power supply OFF) 

2.1V 

5.25V 

Source current, Vpson = low 

 

4mA 

Power up delay:        T

pson_on_delay

 5msec 

400msec 

PWOK delay:             T 

pson_pwok

  

50msec 

 
 
 
 
 
 
 
 
 
 
 

 

3.1.7.4 

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 the 
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. 

 

 

 

≤ 1.0 V 

PS is 

enabled 

≥ 2.0 V 

PS is 

disabled 

 
1.0V 

2.0V 

5.25V 

0V