SPSH4 Server SystemTechnical Product Specification
Revision 1.11
Intel reference number 10736
35
4.2.6.4
Power supply Failure
In the event of a power supply failure (OVP at any output, UV at any output, fan failure, or other
failure) the power supply failure signal is allowed to go HIGH by the power supply.
Table 29: FAIL Signal Characteristics
Signal Type
Open collector/drain output from power supply. Pull-
up to VSB located system.
FAIL = High
Failed
FAIL = Low
OK
MIN MAX
Logic level low voltage, Isink=4ma
0V 0.4V
Logic level high voltage, Isink=50
µ
A
5.25V
Sink current, FAIL = low
4ma
Sink current, FAIL = high
50
µ
A
FAIL rise and fall time
100
µ
sec
4.2.6.5
Predictive Failure Signal
This signal indicates that the power supply (or power supply fan) is reaching its end of life. The
signal indicates a predictive failure when HIGH.
Table 30: PRFL Signal Characteristics
Signal Type (Active Low)
Open collector/drain output from power supply. Pull-
up to VSB located in system.
PRFL = High
Failing
PRFL = Low
OK
MIN MAX
Logic level low voltage, Isink=4mA
0V 0.4V
Logic level high voltage, Isink=50
µ
A
5.25V
Sink current, FAIL = low
4mA
Sink current, FAIL = high
50
µ
A
PRFL rise and fall time
100
µ
sec
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