Technical Product Specification

Intel® Server System SR1695WB TPS Power Sub-System
Revision 1.4 17
Intel order number: E92079-005
3.4.3 PWOK (power good)
PWOK is a power good signal and shall be pulled HIGH by the power supply to indicate that
all outputs are above their respective lower regulation limits. See Table 17.
Table 17. PWOK Signal Characteristics
Signal Types
Open Collector/Drain Output From Power Supply.
Pull-up To VSB Located Power Supply
PWOK=High Power Good
PWOK=Low Power Not Good
Min Max
Logic level lowvoltage, Isink=4mA 0V 0.4V
Logic level high voltage, Isource=200uA 2.4V 5.25V
Sink current, PWOK=Low 4mA
Source current, PWOK=High 2mA
3.4.4 B/P Fail function
The pin senses the backplane fail signal, when the backplane outputs causes OCP, OVP, or
any other fail, the B/P fail signal pin goes HIGH, the module will shut down and the LED will
indicate “red”.
3.4.5 LED indicators
These will be a bi-color LED to indicate power supply status, Refer to the tables below for
AC power supply module and DC power supply modules.
Table 18. Power Supply Module LED Indicator
Power Supply Condition Power Supply LED
No AC power to all PSU OFF
No AC power to this PSU only Flashing RED*
AC present/only standby output on Flashing GREEN*
Power supply DC output ON and OK GREEN
Power supply failure RED
Power supply warning Flashing RED/GREEN*
Note: *Flashing frequency: 1 sec on/ 1 sec off
Table 19. DC Power Supply Module LED Indicator.
Power Supply Condition Power Supply LED
No DC power to all PSU OFF
No DC power to this PSU only Flashing RED*
DC present/only standby output on Flashing BlUE*
Power supply DC output ON and OK BLUE
Power supply failure RED
Power supply warning Flashing RED/BLUE*
Note: *Flashing frequency: 1 sec on/ 1 sec off