Pson; Pwok (Power Ok) Output Signal; Figure 38. Pson# Required Signal Characteristic - Intel SR1425BK1 - Entry Server Platform Technical Specifications

Intel® Server Chassis SC1400UP / Intel® Server Platform SR1425BK1-E
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6.37 PSON

Input Signal
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The PSON signal is required to remotely turn on/off the power supply. PSON
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 Figure 37. Turn
On/Off Timing for timing diagram.
Signal Type
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PSON = Low
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PSON = High or Open
Logic level low (power supply ON)
Logic level high (power supply OFF)
Source current, Vpson = low
Power up delay:
PWOK delay:
0.3V ≤ Hysteresis ≤ 1.0V
in 1.0-2.0V input voltage range is required
Disabled
Enabled
0V

6.38 PWOK (Power OK) Output Signal

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
Revision 1.0
Table 41. PSON
T
pson_on_delay
T
pson_pwok
≤ 1.0 V PS is
enabled
1.0V

Figure 38. PSON# Required Signal Characteristic.

#
Signal Characteristic
Accepts an open collector/drain input from the system.
Pull-up to VSB located in power supply.
ON
OFF
MIN
0V
2.0V
5msec
≥ 2.0 V PS is
disabled
2.0V
#
is an active low
MAX
1.0V
5.25V
4mA
400msec
50msec
5.25V
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