Intel DB75EN Technical Product Specification - Page 52
Front Panel Header
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Intel Desktop Board DB75EN Technical Product Specification 2.2.2.4 Front Panel Header This section describes the functions of the front panel header. Table 26 lists the signal names of the front panel header. Figure 12 is a connection diagram for the front panel header. Table 26. Front Panel Header Pin Signal Name Description 1 HDD_POWER_LED Pull-up resistor (750 Ω) to +5V 3 HDD_LED# [Out] Hard disk activity LED 5 GROUND Ground 7 RESET_SWITCH# [In] Reset switch 9 +5V_DC Power Pin Signal Name 2 POWER_LED_MAIN 4 POWER_LED_ALT 6 POWER_SWITCH# 8 GROUND 10 Key Description [Out] Front panel LED (main color) [Out] Front panel LED (alt color) [In] Power switch Ground No pin Figure 12. Connection Diagram for Front Panel Header 2.2.2.4.1 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 a SATA hard drive or optical drive connected to an onboard SATA connector. 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. 52