Datasheet

Intel Desktop Board D875PBZ Technical Product Specification

2.8.3.1.2 Reset Switch Connector

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 Desktop Board D875PBZ resets and runs the

POST.

2.8.3.1.3 Power/Sleep/Message Waiting LED Connector

Pins 2 and 4 can be connected to a one- or two-color LED. Table 34 shows the possible states for

a one-color LED. Table 35 shows the possible states for a two-color LED.

Table 34. States for a One-Color Power LED

LED State Description

Off Power off/sleeping

Steady Green Running

Blinking Green Running/message waiting

Table 35. States for a Two-Color Power LED

LED State Description

Off Power off

Steady Green Running

Blinking Green Running/message waiting

Steady Yellow Sleeping

Blinking Yellow Sleeping/message waiting

✏ NOTE

To use the message waiting function, ACPI must be enabled in the operating system and a

message-capturing application must be invoked.

2.8.3.1.4 Power Switch Connector

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 Desktop Board D875PBZ.) At

least two seconds must pass before the power supply will recognize another on/off signal.

2.8.3.2 Auxiliary Front Panel Power/Sleep/Message-Waiting LED Connector

Pins 1 and 3 of this connector duplicate the signals on pins 2 and 4 of the front panel connector.

Table 36. Auxiliary Front Panel Power/Sleep/Message-Waiting LED Connector

Pin Signal Name In/Out Description

1 HDR_BLNK_GRN Out Front panel green LED

2 Not connected

3 HDR_BLNK_YEL Out Front panel yellow LED