Ampro Corporation Littleboard 550 manual Utility Interfaces, Utility 1 Interface J16

Chapter 3 Hardware

Utility Interfaces

The Utility interfaces consists of three connectors that provide the standard interface signals, which include the:

•Utility 1

♦Keyboard

♦External battery connection

♦Reset Switch

♦PC Speaker

•Utility 2

♦PS/2 Mouse

♦SMBus signals

♦USB signals for USB ports 1 and 2

♦Power button signal

•Utility 3

♦USB signals for USB ports 3 (USB0) and 4 (and USB1)

Utility 1 Interface (J16)

Utility 1 interface consists of a 16-pin connector and is used to interface the various utility signals to an external board with external connections or directly to the respective connector, such as, a keyboard, speaker, etc. Table 3-17 gives the pin outs and interface signals for the Utility 1 interface.

•Keyboard

•Battery

•Reset Switch

•Speaker

Keyboard Interface

The signal lines for the PS/2 keyboard are provided through the Utility 1 interface (J16), which is also fully PC/AT compatible.

External Battery

An external battery input connection is provided through the Utility 1 interface (J16) 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 (hard or soft) are provided through the Utility 1 interface (J16).

NOTE	To perform the equivalent of a power-on reset, the reset button
	must be pressed and held for a minimum of three seconds.

PC Speaker

The signal lines for a speaker port with 0.1-watt drive are provided through a Utility 1 interface (J16).

LittleBoard 550 Reference Manual 47