Specifications

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.