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Multifunction Connector, CN5
The Multifunction connector on CN5 implements the following functions:
• Speaker output
• AT keyboard
• System reset input
• Watchdog Timer output
• Battery Input
• Programming voltage 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 two pins 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.
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 ’DIN’ connector. The following table lists the
relationship between the Multifunction connector pins and a standard ’DIN’ keyboard connector.
Multifunction Connector, CN5
Pin Signal Function in/out
1 SPKR+ Speaker output out
2 SPKR- Speaker output out
3 RESET External reset in
4 WD Watchdog output out
5 KBD Keyboard Data in
6 KBC Keyboard Clock out
7 GND Ground --
8 KBP Keyboard Power out
9 BAT Battery input in
10 Vpp Vpp for programming in
9 7 5 3 1
BAT GND KBD RESET SPKR+
Vpp KBP KBC WD SPKR-
10 8 6 4 2