Eurotech Appliances CPU-1461 The Eurotech Multifunction Adapter, ƒ System reset, ƒ Speaker

16 PC/104-Plus – CPU-1461 Module

ƒSystem reset

The connection of the multifunction connector pin 9 to ground performs a hardware reset of the module. It is possible to use an external push-button (normally open) to manually reset the system. The reset signal is “de-bounced” on the board.

ƒExternal Battery

Pin 7 of the multifunction connector allows the connection of an external backup battery. If you connect a battery, then the voltage must be between 3.0V and 3.9V.

This battery is used when the system is powered down to preserve the Real Time Clock data. The typical battery consumption with the module off is 7uA.

ƒSpeaker

A transistor that supplies 0.1W to an external speaker controls these outputs. A transistor amplifier buffers the speaker signal. Use a small general-purpose 2” or 3” permanent magnet speaker with an 8Ω voice coil. The audio output is based on two signals: one come from the output of Timer 2, and the other come from I/O port 61h compliant with the AT Standard.

The Eurotech Multifunction Adapter

The Eurotech Multifunction Adapter simplifies the connection of mouse and keyboard with two PS/2 connectors, a speaker, battery and a reset pushbutton.

Speaker

Battery

J6 J1 J5

J4

To Multif. Conn.
	Not
Of CPU Board
	used
(Mouse sign.)

To Multif. Conn.

of CPU Board

J3	J2	S1
Mouse	Keyboard	Reset
		Pushbutton

Power Led

Spkr Led

Figure 5. Multifunction Adapter (both sides)