Datasheet

Power Supply Specification Guidelines Intel® Server Board S2600CW Family TPS
134 Revision1.11
Table 60. PWOK Signal Characteristics
Signal Type Open collector/drain output from power supply.
Pull-up to VSB located in the power supply.
PWOK = High Power OK
PWOK = Low Power Not OK
MIN MAX
Logic level low voltage, Isink=400uA 0V 0.4V
Logic level high voltage, Isource=200A
2.4V 3.46V
Sink current, PWOK = low 400uA
Source current, PWOK = high 2mA
PWOK delay: T
pwok_on
100ms 1000ms
PWOK rise and fall time
100sec
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).
10.2.6.3 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 be
activated in case the critical component temperature reaches a warning threshold, general
failure, over-current, over-voltage, under-voltage, or fan failure. 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 61. 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