16-button keypads have a clever method of encoding their data into 8 pins. Pins are mapped to four rows and four columns on the keypad. A user reads the keypad by bringing each row up to logic: HIGH, ...

Designed a state machine to scan and debounce 16 key Keypad. Implemented RTL coding of a sequential state machine to implement a keypad scanner. Displayed number of keystrokes and the key value of the ...

Using eight digital inputs, this circuit simplifies decoding of the common membrane 4x4 keypad matrix and eliminates the traditional requirement of scanning rows or columns. Any X-Y switch matrix, ...

Asahi Kasei Microdevices’ AK4184A is a 12-bit A/D converter with 4-wire resistive Touch Screen Controller (TSC). The device supports SPI interface for communication to a host controller and is very ...