Connection Diagram For Front Panel Header; Hard Drive Activity Led Header; 2.2.2.4 Front Panel Header - Intel DH77EB Specification

Intel Desktop Board DH77EB Technical Product Specification
For information about
Power supply considerations

2.2.2.4 Front Panel Header

This section describes the functions of the front panel header. Table 31 lists the signal
names of the front panel header. Figure 11 is a connection diagram for the front panel
header.
Table 31. Front Panel Header
Pin Signal Name
1 HDD_POWER_LED
3 HDD_LED#
5 GROUND
7 RESET_SWITCH#
9 +5V_DC
Figure 11. 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.
54
Description Pin
Pull-up resistor (750 2
Ω) to +5V
[Out] Hard disk 4
activity LED
Ground 6
[In] Reset switch 8
Power 10
Refer to
Section 2.5.1 on page 60
Signal Name Description
POWER_LED_MAIN [Out] Front panel LED
(main color)
POWER_LED_ALT [Out] Front panel LED
(alt color)
POWER_SWITCH# [In] Power switch
GROUND Ground
Key No pin