Intel
®
Entry Server Chassis SC5299-E TPS Power Sub-system
Revision 3.1
Intel order number D37594-005
103
2.5.9.3 Over-temperature Protection (OTP)
The power supply is protected against over-temperature conditions caused by loss of fan
cooling or excessive ambient temperature. In an OTP condition the power supply will shut down.
When the power supply temperature drops to within specified limits, the power supply will
restore power automatically, while the 5VSB remains always on. The OTP circuit has a built-in
hysteresis such that the power supply will not oscillate on and off due to a temperature
recovering condition. The OTP trip level has a minimum of 4 degrees C of ambient temperature
hysteresis.
2.5.10 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
2.5.10.1 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, +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 127. 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) 2.1V 5.25V
Source current, Vpson = low 4mA
Power up delay: T
pson_on_delay
5msec 400msec
PWOK delay: T
pson_pwok
50msec
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