Technical Product Specification

Power Sub-system Intel® Workstation System SC5650SCWS TPS
Revision 1.2
Intel order number: E81822-002
80
Table 47. PWOK Signal Characteristics
Signal Type Open collector/drain output from power supply. Pull-up to
VSB located in system.
PWOK = High Power OK
PWOK = Low Power Not OK
MIN MAX
Logic level low voltage, Isink=4mA 0V 0.4V
Logic level high voltage, Isource=200μA 2.4V 5.25V
Sink current, PWOK = low 4mA
Source current, PWOK = high 2mA
PWOK delay: Tpwok_on 100ms 1000ms
PWOK rise and fall time 100μsec
Power down delay: T pwok_off 1ms 200msec
4.1.9.3 LED
There is a single bi-color LED to indicate power supply status. LED operation is defined in the
following table.
Table 48. LED Indicators
Power Supply Condition LED
No AC power to all power supplies Off
Power supply critical event causing a shutdown: failure, OCP,
OVP, fan fail
Amber
AC present / Only 5VSB on (power supply off) 1-Hz blink Green
Output ON and OK Green
The LED is visible on the power supply’s exterior face. The LED’s location meets ESD
requirements. The LED is securely mounted in such a way that incidental pressure on the LED
will not cause it to be displaced.