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CML47786HX
RTD Embedded Technologies, Inc.
35
Multifunction Connector, CN5
The Multifunction connector implements the following functions:
•
Speaker output
•
AT keyboard
•
System reset input
•
Battery Input
The following table gives the pinout of the Multifunction connector.
Facing the connector pins, the pinout is:
Speaker
A speaker output is available on pins 1 and 2 of the Multifunction connector. These outputs are con-
trolled by a transistor to supply 0.1 watt of power to an external speaker. The external speaker should
have 8 ohm impedance and be connected between pins 1 and 2.
Keyboard
An AT compatible keyboard can be connected to the Multifunction connector. Usually PC key-
boards come with a cable ending with a 5-pin male PS/2 connector. The following table lists the re-
lationship between the Multifunction connector pins and a standard PS/2 keyboard connector.
Table 14: Multifunction Connector CN5
Pin
Signal Function
in/out
1
SPKR+
Speaker output (open collec-
tor)
out
2
SPKR-
Speaker output (+5 volts)
out
3
RESET#
Manual push button reset
in
4
PWRSW#
Power / Standby Switch
--
5
KBD
Keyboard Data
in
6
KBC
Keyboard Clock
out
7
GND
Ground
--
8
KBP
Keyboard Power (+5 volts)
out
9
BAT
Battery input
in
10
--
Not Connected
--
9
7
5
3
1
BAT
GND
KBD
RESET
SPKR+
KBP
KBC
SPKR-
10
8
6
4
2
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