Intel DH77KC Technical Product Specification - Page 56

Alternate Front Panel Power/Sleep LED Header

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Intel Desktop Board DH77KC Technical Product Specification 2.2.2.4.3 Power/Sleep LED Header Pins 2 and 4 can be connected to a one- or two-color LED. Table 32 shows the possible states for a one-color LED. Table 33 shows the possible states for a two-color LED. Table 32. States for a One-Color Power LED LED State Description Off Power off/sleeping Steady Green Running Table 33. 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 32 and Table 33 are suggested colors only. Actual LED colors are chassis-specific. 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/Sleep LED Header Pins 1 and 3 of this header duplicate the signals on pins 2 and 4 of the front panel header. Table 34. Alternate Front Panel Power/Sleep LED Header Pin Signal Name 1 POWER_LED_MAIN 2 Key (no pin) 3 POWER_LED_ALT Description [Out] Front panel LED (main color) [Out] Front panel LED (alt color) 56

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Intel Desktop Board DH77KC Technical Product Specification
56
2.2.2.4.3
Power/Sleep LED Header
Pins 2 and 4 can be connected to a one- or two-color LED.
Table 32 shows the
possible states for a one-color LED.
Table 33 shows the possible states for a two-color
LED.
Table 32.
States for a One-Color Power LED
LED State
Description
Off
Power off/sleeping
Steady Green
Running
Table 33.
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 32 and Table 33 are suggested colors only.
Actual LED colors
are chassis-specific.
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/Sleep LED Header
Pins 1 and 3 of this header duplicate the signals on pins 2 and 4 of the front panel
header.
Table 34.
Alternate Front Panel Power/Sleep LED Header
Pin
Signal Name
Description
1
POWER_LED_MAIN
[Out] Front panel LED (main color)
2
Key (no pin)
3
POWER_LED_ALT
[Out] Front panel LED (alt color)