Intel DH77DF Technical Product Specification - Page 56

Front Panel Header

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Intel Desktop Board DH77DF Technical Product Specification 2.2.3.4 Front Panel Header This section describes the functions of the front panel header. Table 32 lists the signal names of the front panel header. Figure 13 is a connection diagram for the front panel header. Table 32. 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 13. Connection Diagram for Front Panel Header 2.2.3.4.1 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. 56

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Intel Desktop Board DH77DF Technical Product Specification
56
2.2.3.4
Front Panel Header
This section describes the functions of the front panel header.
Table 32 lists the signal
names of the front panel header.
Figure 13 is a connection diagram for the front panel
header.
Table 32.
Front Panel Header
Pin
Signal Name
Description
Pin
Signal Name
Description
1
HDD_POWER_LED
Pull-up resistor
(750
Ω
) to +5V
2
POWER_LED_MAIN
[Out] Front panel LED
(main color)
3
HDD_LED#
[Out] Hard disk
activity LED
4
POWER_LED_ALT
[Out] Front panel LED
(alt color)
5
GROUND
Ground
6
POWER_SWITCH#
[In] Power switch
7
RESET_SWITCH#
[In] Reset switch
8
GROUND
Ground
9
+5V_DC
Power
10
Key
No pin
Figure 13.
Connection Diagram for Front Panel Header
2.2.3.4.1
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.