Technical Product Specification
System Power Sub-system Intel® Server System P4000IP and Intel® Workstation System P4000CR Family TPS
Revision 1.2 Intel order number G38159-002
35
Signal Type
Open collector/drain output from power supply. Pull-up to
VSB located in the power supply.
PWOK delay: T
pwok_on
100ms
1000ms
PWOK rise and fall time
100sec
Power down delay: T
pwok_off
1ms
200msec
A recommended implementation of the Power Ok circuits is shown below.
Note: The Power Ok circuits should be compatible with 5V pull up resistor (>10k) and 3.3V pull
up resistor (>6.8k).
2.1.6.3 SMBAlert# Signal
This signal indicates that the power supply is experiencing a problem that the user should
investigate. This shall be asserted due to Critical events or Warning events. The signal shall
activate in the case of critical component temperature reached a warning threshold (see sec.
4.10), general failure, over-current, over-voltage, under-voltage, failed fan. This signal may also
indicate the power supply is reaching its end of life or is operating in an environment exceeding
the specified limits.
This signal is to be asserted in parallel with LED turning solid Amber or blink Amber.
Table 26. SMBAlert# Signal Characteristics
Signal Type (Active Low)
Open collector/drain output from power supply.
Pull-up to VSB located in system.
Alert# = High
OK
Alert# = Low
Power Alert to system
MIN
MAX
Logic level low voltage, Isink=4 mA
0 V
0.4 V
Logic level high voltage, Isink=50 A
3.46 V
Sink current, Alert# = low
4 mA
Sink current, Alert# = high
50 A
Alert# rise and fall time
100 s
2.1.7 Thermal CLST
The power supply shall assert the SMBAlert signal when a temperature sensor crosses a
warning threshold. Refer to the Intel
®
Common Hardware and Firmware Requirements for
CRPS Power Supplier for detailed requirements.
2.1.8 Power Supply Diagnostic “Black Box”
The power supply saves the latest PMBus data and other pertinent data into nonvolatile
memory when a critical event shuts down the power supply. This data is accessible by the
SMBus interface with an external source providing power to the 12Vstby output.
Refer to the Intel
®
Common Hardware and Firmware Requirements for CRPS Power Supplier
for detailed requirements.