
3.5"-SBC-WLU - User Guide, Rev. 1.8
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7.8.
Front Panel Pin Header (FP1 & FP2)
The 8-pin 2.54 mm pitch front panel pin header FP1 supplies signals for the reset button, storage LED and system
warning speaker.
The 10-pin 2.54 mm pitch front panel pin header FP2 supplies signals for the power button, power LED, and SM Bus.
Figure 18: Front Panel 1 Pin Header FP1
Table 24: Pin Assignment FP1
Pin
Signal
Description
Note
1
Reset
System reset button (+)
2
S
External system warning speaker (+)
3
Reset Button -
System reset button (-)
4
-
No connection
5
HDD LED +
HDD activity LED (+). The LED lights up or flashes when data is
ready from or written to the HDD.
6
Internal Speaker - Internal system warning speaker (-)
7
HDD LED -
HDD activity LED (-).
8
Speaker -
External system warning speaker (-)
Connector Type
B2W, 2x4-pin, 2.54 mm pitch
Mating Connector
Vendor
Housing Model No.
Terminal Model No.
PINREX
741-75-204B01
741-70-FT0001
Internal Buzzer is enabled when Pin6-8 is shorted.
Figure 19: Front Panel 2 Pin Header FP2
Table 25: Pin Assignment FP2
Pin
Signal
Description
Note
1
Power LED +
System Power LED (+). The LED lights up when users turn on the
-
+
SPKR
+
7
8
HLED
2
1
-
+
RSTBTN
-
-
SM_DATA
SM_ALERT#
GND
BAT_LOW#
1
10
9
+
2
PLED
PWRBTN
-
+
SM_CLK