Q7B300 Qseven Module Development Board
14
Board and Pin Assignments
2.5.2
Front Panel Connector (CN2)
The CN2 is a 2x5-pin connector for front panel interface.
ATX Power Supply ON
Short pin 1 and pin 2, ATX power supply is forcing to turn on state. Otherwise, system
will control ATX power supply state.
Power LED
Pin 4 connects anode(+) of LED and pin 3 connects cathode(-) of LED. The power LED
lights up when the system is powered on.
Power On/Off Button
Pin 5 and 6 connect the power button on front panel to the CPU board, which allows
users to turn on or off power supply.
System Reset Switch
Pin 7 and 8 connect the case-mounted reset switch that reboots your computer without
turning off the power switch. It is a better way to reboot your system for a longer life of
system power supply.
HDD Activity LED
This connection is linked to hard drive activity LED on the control panel. LED flashes
when HDD is being accessed. Pin 9 and 10 connect the hard disk drive to the front panel
HDD LED, pin 9 is assigned as cathode(-) and pin 10 is assigned as anode(+).
2.5.3
SMBus Connector (CN4)
The CN4 is a 5-pin connector for SMBus interface. The SMBus (System Management
Bus) is a simple bus for the purpose of lightweight communication.
Pin
Signal
Pin
Signal
1
GND
2
ATX_PSON#
3
PWRLED-
4
5
PWRSW-
6
PWRSW+
7
HW RST-
8
HW RST+
9
HDDLED-
10
Pin
Signal
1
+3.3V
2
SMB_CLK
3
SMB_DATA
4
SMB_ALERT
5
GND
