Technical Product Specification

Intel® Server Chassis SC5650 TPS Power Sub-system
Revision 1.2
Intel order number E39531-004
29
2.1.7.3 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.
Table 23. PSON# Signal Characteristics
Signal Type Accepts an open collector/drain input from the system. Pull-up
to 5 V located in power supply.
PSON
#
= Low ON
PSON
#
= High or Open OFF
MIN MAX
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
5 msec 400 msec
PWOK delay: T
pson_pwok
50 msec
Figure 10. PSON# Required Signal Characteristics
2.1.7.4 PWOK (Power OK) Output Signal
PWOK is a power OK signal and is pulled HIGH by the power supply to indicate all the outputs
are within the regulation limits of the power supply. When any output voltage falls below
regulation limits or when AC power is removed for a time sufficiently long so the power supply
operation is no longer guaranteed, PWOK is 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
1.
Enabled
Disabled
0.3V Hysterisis 1.0V
In 1.0-2.0V input voltages range is required
2.
.25V
3.
V