Technical Product Specification

Chassis Power Sub-system Intel
®
Server Chassis P4000S Family TPS
Intel order number G22850-006 Revision 1.5
28
Table 22. Over Voltage Protection (OVP) Limits
Output Voltage
MAX (V)
+3.3V
4.5
+5V
6.5
+12V1,2
14.5
+5VSB
6.5
2.1.7.3 Over Temperature Protection (OTP)
The power supply will be protected against over temperature conditions caused by loss of fan
cooling or excessive ambient temperature. In an OTP condition the PSU will shutdown.
2.1.8 Control 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
2.1.8.1 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, +12V1, +12V2 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
Figure 21 for the timing diagram.
Table 23. 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
#
= High or Open
OFF
MIN
MAX
Logic level low (power supply ON)
0V
1.0V
Logic level high (power supply OFF)
2.0V
5.25V
Source current, Vpson = low
4mA
Power up delay: T
pson_on_delay
5msec
400msec
PWOK delay: T
pson_pwok
50msec