DP35DP datasheet(49/84 Pages) INTEL

49 / 84 page

Technical Reference

2.2.2.5.1

Hard Drive Activity LED Header

Pins 1 and 3 can be connected to an LED to provide a visual indicator that data is

being read from or written to a hard drive. Proper LED function requires one of the

following:

•

A Serial ATA hard drive connected to an onboard Serial ATA connector

•

A Parallel ATA IDE hard drive connected to an onboard Parallel ATA IDE connector

2.2.2.5.2

Reset Switch Header

Pins 5 and 7 can be connected to a momentary single pole, single throw (SPST) type

switch that is normally open. When the switch is closed, the board resets and runs the

POST.

2.2.2.5.3

Power/Sleep LED Header

Pins 2 and 4 can be connected to a one- or two-color LED. Table 22 shows the

possible states for a one-color LED. Table 23 shows the possible states for a two-color

LED.

Table 22. States for a One-Color Power LED

LED State

Description

Off

Power off/sleeping

Steady Green

Running

Table 23. States for a Two-Color Power LED

LED State

Description

Off

Power off

Steady Green

Running

Steady Yellow

Sleeping

NOTE

The colors listed in Table 22 and Table 23 are suggested colors only. Actual LED

colors are chassis-specific.

2.2.2.5.4

Power Switch Header

Pins 6 and 8 can be connected to a front panel momentary-contact power switch. The

switch must pull the SW_ON# pin to ground for at least 50 ms to signal the power

supply to switch on or off. (The time requirement is due to internal debounce circuitry

on the board.) At least two seconds must pass before the power supply will recognize

another on/off signal.

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