Intel DH57DD Product Specification - Page 49

Alternate Front Panel Power LED Header

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Technical Reference 2.2.2.4.2 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. 2.2.2.4.3 Power LED Header Pins 2 and 4 can be connected to a one- or two-color LED. Table 29 shows the default states for this LED. More options are available through BIOS setup. Table 29. States for a One-Color Power LED LED State Description Off Power off/sleeping Steady Lit Running Blink Standby 2.2.2.4.4 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. 2.2.2.5 Alternate Front Panel Power LED Header Pins 1 and 3 of this header duplicate the signals on pins 2 and 4 of the front panel header. Table 30. Alternate Front Panel Power LED Header Pin Signal Name In/Out Description 1 FP_LED+ Out 2 Not connected 3 FP_LED− Out FP_LED+ FP_LED− 49

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Technical Reference
49
2.2.2.4.2
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.
2.2.2.4.3
Power LED Header
Pins 2 and 4 can be connected to a one- or two-color LED.
Table 29 shows the default
states for this LED.
More options are available through BIOS setup.
Table 29.
States for a One-Color Power LED
LED State
Description
Off
Power off/sleeping
Steady Lit
Running
Blink
Standby
2.2.2.4.4
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.
2.2.2.5
Alternate Front Panel Power LED Header
Pins 1 and 3 of this header duplicate the signals on pins 2 and 4 of the front panel
header.
Table 30.
Alternate Front Panel Power LED Header
Pin
Signal Name
In/Out
Description
1
FP_LED+
Out
FP_LED+
2
Not connected
3
FP_LED
−
Out
FP_LED
−