SSI

ERP2U Power Supply Design Guide, V2.31

8Control and Indicator Functions

The following sections define the input and output signals from the power supply. Signals that can be defined as low true use the following convention:

signal# = low true

8.1PSON#

STATUS

Required

The PSON# signal is required to remotely turn on/off the power supply. PSON# is an active low signal that turns on the +3.3 V, +5 V, +12 V, and -12 V power rails. When this signal is not pulled low by the system, or left open, the outputs (except the +5 VSB and Vbias) turn off. This signal is pulled to a standby voltage by a pull-up resistor internal to the power supply. Refer to Figure 4 for timing diagram.

 

Table 29: PSON# Signal Characteristic

 

Signal Type

 

Accepts an open collector/drain input from the system.

 

Pull-up to VSB located in power supply.

 

 

 

 

 

 

PSON# = Low

 

ON

 

PSON# = Open or High

OFF

 

 

 

MIN

MAX

Logic level low (power supply ON)

0 V

1.0 V

 

 

Logic level high (power supply OFF)

2.0 V

5.25 V

 

 

Source current, Vpson = low

 

4 mA

 

 

Power up delay:

Tpson_on_delay

5 ms

400 ms

 

 

PWOK delay:

T pson_pwok

 

50 ms

 

 

Disabled

Enabled

Hysteresis ≥ 0.3V and/or other de-bounce method

≤ 1.0 V

≥ 2.0 V

PS is

PS is

enabled

disabled

0V

1.0V

2.0V

5.25V

Figure 5: PSON# Signal Characteristics

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SSI America ERP2U manual Control and Indicator Functions, Pson#, Pson # Signal Characteristic Signal Type, Pwok delay
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