Intel® Server Chassis SR1475 / Intel® Server System SR1475NH1-E
Revision 1.0
- 68 -
6.35 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 power supply will shutdown.
When the power supply temperature drops to within specified limits, the power supply shall
restore power automatically, while the 5VSB remains always on. The OTP circuit must have
built in hysteresis such that the power supply will not oscillate on and off due to temperature
recovering condition. The OTP trip level shall have a minimum of 4
°
C of ambient temperature
hysteresis.
6.36 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.
6.37 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.
Table 43. 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
Summary of Contents for SR1475
Page 87: ......
