Electronic Design

Basic Circuit Eliminates Numeric Keypad Polling

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, ...
Business Wire

Programmable Low-power GPIO/Keypad Controllers Simplify Interconnect Circuits for Large QWERTY Keypads

NORWOOD, Mass.--(BUSINESS WIRE)--Analog Devices, Inc. (ADI), a global leader in high-performance semiconductors for signal processing applications, introduced today the ADP5585 and ADP5589 GPIO ...
Hackaday

Simple Keypad Scanning With SPI And Some Hardware

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, ...
EDN

Camera serializer/deserializer chip set reduces wire count for keypad

Many systems that require a user to manually enter data feature a keyboard similar to that in Figure 1. Although early keypads comprised arrays of individually wired switches, a typical modern keypad ...
Electronic Design

Basic Circuit Eliminates Numeric Keypad Polling (.PDF Download)

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, ...