Chapter 10
Keyboard Interface
Kontron User's Guide PC/104-520
22
10.2
Signal Descriptions
/RESIN
Input on CPU modules
Speaker
Open collector output on modules that drive a piezo electronic speaker
Input on modules that connects a 5V piezo electronic speaker to this pin
An 8 Ohm loudspeaker also can be connected between SPEAKER and GND, but because
of current limitation the volume will be low
Connect only one speaker to this pin. The CPU usually drives this pin. However, other
modules also can use this signal to drive the system speaker
KBDAT (Keyboard Data)
Bidirectional I/O pin on CPU modules
Keyboard data signal
KBCLK (Keyboard Clock)
Bidirectional I/O pin on CPU modules
Keyboard clock signal
BATT (System Battery Connection)
This pin connects a system battery to all modules
The battery voltage has to be higher than 2.4V and lower than 3.6V. A 3V battery is
recommended
A battery is not needed to hold CMOS setup data. Your configurations for hard disks,
floppy drives, and other peripherals are saved in an onboard EEPROM. However, you
need a battery to save the CMOS date and time when power supply is turned off
