2.2.3.5 Alternate Front Panel Power/Sleep Led Header - Intel DH77DF Specification

2.2.3.4.2 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.
2.2.3.4.3 Power/Sleep LED Header
Pins 2 and 4 can be connected to a one- or two-color LED. Table 33 shows the
possible states for a one-color LED. Table 34 shows the possible states for a two-color
LED.
Table 33. States for a One-Color Power LED
LED State
Off
Steady Green
Table 34. States for a Two-Color Power LED
LED State
Off
Steady Green
Steady Yellow
NOTE
The colors listed in Table 33 and Table 34 are suggested colors only. Actual LED colors
are chassis-specific.
2.2.3.4.4 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.

2.2.3.5 Alternate Front Panel Power/Sleep LED Header

Pins 1 and 3 of this header duplicate the signals on pins 2 and 4 of the front panel
header.
Table 35. Alternate Front Panel Power/Sleep LED Header
Pin Signal Name
1 POWER_LED_MAIN
2 Key (no pin)
3 POWER_LED_ALT
Description
Power off/sleeping
Running
Description
Power off
Running
Sleeping
Description
[Out] Front panel LED (main color)
[Out] Front panel LED (alt color)
Technical Reference
57