Technical Product Specification
Intel® Server System P4000IP and Intel® Workstation System P4000CR Family TPS System Power Sub-system
48 Intel order number G38159-002 Revision 1.2
Table 44. PWOK Signal Characteristics
Signal Type
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=200A
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
100sec
Power down delay: T
pwok_off
1ms
200msec
Q2
2N4401
PWOK out
PWOK in
Q1
2N4401
12V
3.3VSB
R2
20
R4
820
R3
10k
R1
10k
Figure 23. PWOK Circuit Requirement
2.2.6.3 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
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.