ADLINK Technology LitleBoard 800, Reference Manual

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Chapter 3 Hardware
26 Reference Manual LittleBoard 800
Utility Interfaces
The Utility interfaces consist of three connectors that provide the standard interface signals for the following
devices:
•
Utility 1 (J15)
♦
Keyboard
♦
External battery connection
♦
Reset Switch
♦
Speaker
•
Utility 2 (J13)
♦
PS/2 Mouse
♦
Infrared (IrDA) signals
♦
SMBus signals
♦
USB signals for USB ports 1 and 2
♦
Power button signal
•
Utility 3 (J14)
♦
USB signals for USB ports 3 and 4
Utility 1 Interface
The Utility 1 (J15) interface uses a 16-pin header and provides the various interface signals to an external I/
O board with external connections for the respective connectors such as, keyboard, speaker, etc. Table 3-7
provides the pin signals for the Utility 1 interface, which uses 16 pins, 2 rows, odd/even, (1, 2) with 0.100"
pitch.
•
Keyboard
•
Battery
•
Reset Switch
•
Speaker
•
External voltages (-5V In, -12V In, +3.3V Out to Power On LED)
Keyboard Interface
The signal lines for a PS/2 keyboard are provided through the Utility 1 interface, which is also fully PC/AT
compatible.
External Battery
An external battery input connection is provided through a Utility 1 interface for the Real Time Clock’s
operation in the event the on-board battery is not used.
Reset Switch
The signal lines for a reset switch are provided through the Utility 1 interface.
NOTE To perform the equivalent of a power-on reset, the reset button must be pressed
and held for a minimum of three seconds.