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3.2 Remote ON/OFF
The per PSON# signal is required to remotely turn on/off the power supply. PSON# is an active low signal that turns on
the +48VDC power rail. When this signal is not pulled low by the system, or left open, the +48VDC output turns off.
The 5Vsb output remains on. This signal is pulled to a standby voltage by a pull-up resistor internal to the power sup-
ply. The power supply fan(s) shall operate at the lowest speed.
Signal Type
PSON# = Low
PSON# = Open
Logic level low (power supply ON)
Logic level high (power supply OFF)
Source current, Vpson = low
Power up delay: T pson_on_delay
Refer to IPS of HPS3000-9 PN: 41966008950
4. PMBus Communication
The per power supplies can be communicated with computer by our GUI interface hardware and software.
Table 2 PSON# Signal Characteristics
Accepts an open collector/drain input from the system.
Pulled-up to the 3V3sb located inside the power supply.
MIN
0 V
2.40 V
5msec
Embedded Power for
Business-Critical Continuity
ON
OFF
MAX
0.4 V
3.40 V
4 mA
400msec
Rev.06.09.10
HPR12K-00
3 of 6
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