AN1809 Datasheet, PDF (1/8 Pages) STMicroelectronics – STR71x ADC DRIVING AN ANALOG KEYBOARD

AN1809
APPLICATION NOTE
STR71x ADC
DRIVING AN ANALOG KEYBOARD
INTRODUCTION
This application note gives an example of how to use the STR71x Analog to Digital Converter
(ADC) to read input from an analog keyboard. The purpose is to decode a number of keys
through only one analog I/O port pin, this has the advantage of reducing the number of pins
used compared to a traditional matrix keyboard which requires a large number of I/O port pins.
AN1809/0205
Rev. 2
1/8
1