Datasheet

1300 Henley Court

Pullman, WA 99163

509.334.6306

www.digilentinc.com

PmodKYPD™ Reference Manual

Revised April 8, 2016

This manual applies to the PmodKYPD rev. B

DOC#: 502-195

Other product and company names mentioned may be trademarks of their respective owners.

Page 1 of 2

Overview

The Digilent PmodKYPD is a 16 button keypad, providing users with immense configurability.

1 Functional Description

The PmodKYPD utilizes 4 rows and columns to create an array of 16 momentary pushbuttons. By driving the

column lines to a logic level low voltage one at a time, users may read the corresponding logic level voltage on

each of the rows to determine which button, if any, is currently being pressed. Simultaneous button presses can

also be recorded, although it is still required to step through each row and column separately in order to ensure

that the pressed buttons do not interfere with each measurement.

2 Interfacing with the Pmod

The PmodKYPD communicates with the host board via the GPIO protocol. Each button is placed within a

simple voltage divider circuit. When a button is not pressed, a large pull-up resistor maintains a logic level high

voltage on each of the row pins. When a column pin is driven to a logic level low voltage and a corresponding

The PmodKYPD.

 16 momentary push-buttons

 Can detect simultaneous button presses

 Isolated rows and columns

 Small PCB size for flexible designs 3.4“ × 2.7” (8.6 cm

× 6.9 cm)

 12-pin Pmod port with GPIO interface

 Follows Digilent Pmod Interface Specification Type 1

 Library and example code available in resource

center

Features include:

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300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com PmodKYPD™ Reference Manual Revised April 8, 2016 This manual applies to the PmodKYPD rev. B Overview The Digilent PmodKYPD is a 16 button keypad, providing users with immense configurability. Features include:        16 momentary push-buttons Can detect simultaneous button presses Isolated rows and columns Small PCB size for flexible designs 3.4“ × 2.7” (8.6 cm × 6.
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PmodKYPD™ Reference Manual button is pressed, completing the voltage divider circuit, the row pin will then read a logic level low voltage instead. Pin 1 2 3 4 5 6 Signal COL4 COL3 COL2 COL1 GND VCC Header J1 Description Pin Column 4 7 Column 3 8 Column 2 9 Column 1 10 Power Supply Ground 11 Power Supply (3.3V/5V) 12 Signal ROW4 ROW3 ROW2 ROW1 GND VCC Description Row 4 Row 3 Row 2 Row 1 Power Supply Ground Power Supply (3.3V/5V) Table 1. Pinout description table.