Power Distribution Board

Intel® Server Platform SR6850HW4 TPS

+3.3V_AUX

+3.3V_AUX

Adobe Systems

LATCH DIP PLUG

Figure 26. Mainboard Connector Signals

6.2.1Remote On/Off (-PS_ON)

The power supply DC outputs are enabled when this signal is pulled low, below 0.8V. In the low state the input will not source more than 1mA of current. The DC outputs are disabled when the input is driven higher than 2.4V, or open circuited.

Provisions for de-bouncing are included in the –PS_ON circuitry. This prevents the power supply from oscillating on and off at startup.

6.2.2Power Good Signal (POK or P_GOOD)

A power good signal is asserted or driven high by the power supply to indicate that all outputs are valid. If any of the outputs fails, this output is driven low.

If AC main power is lost, or if a fan has failed, this signal must be driven low at least 1ms before any of the outputs go out of regulation.

The output is an open collector/drain. It is capable of driving the output below 0.4V with a load

of 4mA. The output has an internal pull-up resistor of 1KΩ between the output and +3.3Vstby. The pull-up is connected to the anode side of the +3.3Vstby OR’ing diode.

This output also goes to I2C port P5.

6.2.3VIN_GOOD

This signal is asserted, driven high, by the power supply to indicate that the input voltage meets the minimum requirements of the input voltage range. Within 12ms after falling outside the input voltage requirements, the output must be driven low.

The output is an open collector/drain. It is capable of driving the output below 0.4V with a load

of 4mA. The output has an internal pull-up resistor of 1KΩ between the output and +3.3Vstby. The pull-up is connected to the anode side of the +3.3Vstby OR’ing diode.

This output also goes to I2C port P4.

66

Revision 1.0

 

Intel order number D23151-001