KeyPad 4x4

This 16-button keypad provides a useful human interface component for microcontroller projects. Convenient adhesive backing provides a simple way to mount the keypad in a variety of applications. The Keypad 4x4 features a total of 16 buttons in Matrix form. This is a membrane keypad with no moving parts. It has a nice overlay depicating a telephone type keypad with additional four functional buttons. A female 8-pin berg connector is provided for interfacing it with your mirocontroller circuits.  

Features

• Ultra-thin design
• Adhesive backing
• Excellent price/performance ratio
• Easy interface to any microcontroller

Application Ideas

• Security systems
• Menu selection
• Data entry for embedded systems

Key Specifications

• Maximum Rating: 24 VDC, 30 mA
• Interface: 8-pin access to 4x4 matrix
• Operating temperature: 32 to 122 °F (0 to 50°C)
• Dimensions: Keypad, 2.7 x 3.0 in (6.9 x 7.6 cm)

Spefications

• Cable Length: 3-1/3" or 85mm (include connector)
• Weight: 8g
• Connector: Dupont 8 pins, 0.1" (2.54mm) Pitch
• Mount Style: Self-Adherence
• Max. Circuit Rating: 24VDC, 30mA 
• Insulation Spec.: 100M Ohm, 100V
• Dielectric Withstand: 250VRms (60Hz, 1min)
• Contact Bounce: <=5ms
• Life Expectancy: 1 million closures
• Operation Temperature: -20 to +40 °C

How it Works
Matrix keypads use a combination of four rows and four columns to provide button states to the host device, typically a microcontroller. Underneath each key is a pushbutton, with one end connected to one row, and the other end connected to one column. These connections are shown below.