Microchip Technology GPIODM-KPLCD User guide

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GPIO Expander Keypad and LCD

Demo Board

User’s Guide

Note the following details of the code protection feature on Microchip devices:

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• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

• Microchip is willing to work with the customer who is concerned about the integrity of their code.

• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer’s risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.

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EELOQ, microID, MPLAB, PIC, PICmicro, PICSTART,

PRO MATE, PowerSmart, rfPIC and SmartShunt are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

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Analog-for-the-Digital Age, Application Maestro, CodeGuard, dsPICDEM, dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, Linear Active Thermistor, Mindi, MiWi, MPASM, MPLIB, MPLINK, PICkit, PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB, rfPICDEM, Select Mode, Smart Serial, SmartTel, Total Endurance, UNI/O, WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

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All other trademarks mentioned herein are property of their respective companies.

Printed on recycled paper.

Microchip received ISO/TS-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona, Gresham, Oregon and Mountain View, California. The Company’s quality system processes and procedures are for its PIC 8-bit MCUs, KEELOQ microperipherals, no nvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified.

code hopping devices, Serial EEPROMs,

GPIO EXPANDER KEYPAD

AND LCD DEMO BOARD

USER’S GUIDE

Table of Contents

Preface ........................................................................................................................... 1

Introduction............................................................................................................ 1

Document Layout .................................................................................................. 1

Conventions Used in this Guide ............................................................................ 2

Recommended Reading........................................................................................ 2

The Microchip Web Site ........................................................................................ 3

Customer Support ................................................................................................. 3

Document Revision History ................................................................................... 3

Chapter 1. Product Overview ....................................................................................... 5

1.1 Introduction ..................................................................................................... 5

1.2 What is the GPIO Expander Keypad and LCD Demo Board? ....................... 5

1.3 What The GPIO Expander Keypad and LCD Demo Board Kit Includes ........ 5

Chapter 2. Installation and Operation ......................................................................... 7

2.1 Introduction ..................................................................................................... 7

2.2 Features ......................................................................................................... 7

2.3 Getting Started ............................................................................................... 8

2.4 GPIO Expander Keypad and LCD Demo Board Description ......................... 9

2.5 Firmware Description ................................................................................... 10

Appendix A. Schematics and Board Layouts ........................................................... 15

A.1 Introduction .................................................................................................. 15

A.2 Board Schematic - Page 1 ......................................................................... 16

A.3 Board Schematic - Page 2 ......................................................................... 17

A.4 Board Schematic - Page 3 ......................................................................... 18

A.5 Board - Top Layer (with Silk screen) .......................................................... 19

A.6 Board - Bottom Layer ................................................................................. 19

Appendix B. Bill Of Materials (BOM) ......................................................................... 21

Worldwide Sales and Service .................................................................................... 24

GPIO Expander Keypad and LCD Demo Board User’s Guide

NOTES:

GPIO EXPANDER KEYPAD

AND LCD DEMO BOARD

USER’S GUIDE

Preface

NOTICE TO CUSTOMERS

All documentation becomes dated, and this manual is no exception. Microchip tools and documentation are constantly evolving to meet customer needs, so some actual dialogs and/or tool descriptions may differ from those in this document. Please refer to our web site (www.microchip.com) to obtain the latest documentation available.

Documents are identified with a “DS” number. This number is located on the bottom of each page, in front of the page number. The numbering convention for the DS number is “DSXXXXXA”, where “XXXXX” is the document number and “A” is the revision level of the document.

INTRODUCTION

This chapter contains general information that will be useful to know before using the GPIO Expander Keypad and LCD Demo Board. Items discussed in this chapter include:

• Document Layout

• Conventions Used in this Guide

• Recommended Reading

• The Microchip Web Site

• Customer Support

• Document Revision History

DOCUMENT LAYOUT

This document describes how to use the GPIO Expander Keypad and LCD Demo Board as a development tool. The manual layout is as follows:

• Chapter 1. “Product Overview” – Important information about the GPIO Expander Keypad and LCD Demo Board.

• Chapter 2. “Installation and Operation” – Includes instructions on how to get started with this evaluation board.

• Appendix A. “Schematics and Board Layouts” – Shows the schematic and layout diagrams for the GPIO Expander Keypad and LCD Demo Board.

• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the GPIO Expander Keypad and LCD Demo Board.

GPIO Expander Keypad and LCD Demo Board User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic characters Referenced books MPLAB

Emphasized text ...is the only compiler...

Initial caps A window the Output window

A dialog the Settings dialog A menu selection select Enable Programmer

Quotes A field name in a window or

dialog

Underlined, italic text with right angle bracket

Bold characters A dialog button Click OK

N‘Rnnnn A number in verilog format,

Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>

Courier New font:

Plain Courier New Sample source code #define START

Italic Courier New A variable argument file.o, where file can be

Square brackets [ ] Optional arguments mcc18 [options] file

Curly brackets and pipe character: { | }

A menu path File>Save

A tab Click the Power tab

where N is the total number of digits, R is the radix and n is a digit.

Filenames autoexec.bat File paths c:\mcc18\h Keywords _asm, _endasm, static Command-line options -Opa+, -Opa- Bit values 0, 1 Constants 0xFF, ‘A’

Choice of mutually exclusive arguments; an OR selection

“Save project before build”

4‘b0010, 2‘hF1

any valid filename

[options] errorlevel {0|1}

IDE User’s Guide

THE MICROCHIP WEB SITE

Microchip provides online support via our web site at www.microchip.com. This web site is used as a means to make files and information easily available to customers. Accessible by using your favorite Internet browser, the web site contains the following information:

• Product Support – Data sheets and errata, application notes and sample programs, design resources, user’s guides and hardware support documents, latest software releases and archived software

• General Technical Support – Frequently Asked Questions (FAQs), technical support requests, online discussion groups, Microchip consultant program member listing

• Business of Microchip – Product selector and ordering guides, latest Microchip press releases, listing of seminars and events, listings of Microchip sales offices, distributors and factory representatives

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative

• Local Sales Office

• Field Application Engineer (FAE)

• Technical Support

• Development Systems Information Line

Customers should contact their distributor, representative or field application engineer for support. Local sales offices are also available to help customers. A listing of sales offices and locations is included in the back of this document.

Technical support is available through the web site at: http://support.microchip.com

Preface

DOCUMENT REVISION HISTORY

Revision A (October 2006)

• Initial Release of this Document.

GPIO Expander Keypad and LCD Demo Board User’s Guide

NOTES:

GPIO EXPANDER KEYPAD

AND LCD DEMO BOARD

USER’S GUIDE

Chapter 1. Product Overview

1.1 INTRODUCTION

This chapter provides an overview of the GPIO Expander Keypad and LCD Demo Board and covers the following topics:

• What is the GPIO Expander Keypad and LCD Demo Board?

• What the GPIO Expander Keypad and LCD Demo Board Kit includes

1.2 WHAT IS THE GPIO EXPANDER KEYPAD AND LCD DEMO BOARD?

The GPIO Expander Keypad and LCD Demo Board allows the system designer to evaluate the operation of the MCP23X17 and MCP23X08 General Purpose I/O (GPIO) Expanders. The board demonstrates the GPIO Expanders’ performance in a keypad and LCD example.

1.3 WHAT THE GPIO EXPANDER KEYPAD AND LCD DEMO BOARD KIT INCLUDES

This GPIO Expander Keypad and LCD Demo Board Kit includes:

• One GPIO Expander Keypad and LCD Demo Board (102-00116)

- MCP23008 GPIO Expander with I

- MCP23S08 GPIO Expander with SPI interface (installed)

- MCP23017 GPIO Expander with I

- MCP23S17 GPIO Expander with SPI interface (installed)

• Analog and Interface Products Demonstration Boards CD-ROM (DS21912)

- GPIO Expander Keypad and LCD Demo Board User’s Guide (DS51636)

-PIC

-PCB Gerber Files

Microcontroller Firmware

C™ interface (installed)

GPIO Expander Keypad and LCD Demo Board User’s Guide

NOTES:

Chapter 2. Installation and Operation

2.1 INTRODUCTION

This chapter discusses the setup and operation of the GPIO Expander Keypad and LCD Demo Board.

The GPIO Expander Keypad and LCD Demo Board is designed to demonstrate using GPIO expanders in a keypad and LCD example. The MCP23X17 interfaces to a 2x16 LCD module and the MCP23X08 interfaces to a 4x4 keyed matrix.

Both the I interfaces.

2.2 FEATURES

The GPIO Expander Keypad and LCD Demo Board has the following features:

• Two (2) 8-bit GPIO Expanders

- MCP23008 with I

- MCP23S08 with SPI interface

• Two (2) 16-bit GPIO Expanders

- MCP23017 with I

- MCP23S17 with SPI interface

• 4X4 keypad layout (16 momentary buttons)

- Numbers 0 - 9

- Six special function buttons

• A 2X16 LCD module

• Headers for the MCP23X08 and MCP23X17 pins

• Header for programming the PIC18F4550

GPIO EXPANDER KEYPAD

AND LCD DEMO BOARD

USER’S GUIDE

C™ and SPI versions are included on the board to demonstrate both serial

C™ interface

GPIO Expander Keypad and LCD Demo Board User’s Guide

2.3 GETTING STARTED

The GPIO Expander Keypad and LCD Demo Board is a fully functional, assembled and tested board for demonstrating the MCP23008 and MCP23017 (I

C interface) and MCP23S08 and MCP23S17 (SPI interface) general purpose I/O expanders. The following describes the basic setup and operation (see Figure 2-1):

1. Either connect a 9V power supply into the power jack (J2) or connect a 5 V power

supply to the V

and GND test points.

2. The green power LED will illuminate.

3. The LCD will display the startup splash screen.

4. The appropriate LEDs (I

C or SPI) will illuminate to indicate the current serial

mode.

5. Pressing buttons:

- 0 - 9, #, *: will be reflected on the LCD

- M: switches modes (I

C and SPI) to communicate with the MCP23X17 and MCP23X08; B: backspace; R: carriage return, and screen clear (2nd press); S: space

FIGURE 2-1: BOARD LAYOUT

2 X 16 LCD

Not Populated

USB

EXT

+5V

Keypad/LCD Demo

GND

16-bit HEADER

MCP23017

LED

7 8 9 M

GPIO Expander

4 5 6 B

1 2 3 R

* 0 # S

PIC18F2550

MCP23008

8-bit HEADER

MCP23S17

LED

I2C/SPI

ICSP

MCP23S08

Installation and Operation

2.4 GPIO EXPANDER KEYPAD AND LCD DEMO BOARD DESCRIPTION

2.4.1 Major Board Components

The functional block diagram is shown in Figure 2-2.

FIGURE 2-2: FUNCTIONAL BLOCK DIAGRAM

Header

Input Output

GPIO

OUTIN

2 X 16 LCD

Control

Power

Programming

1. The GPIO BLOCK contains the MCP23X17 and MCP23X08 GPIO Expanders. Two (2) MCP23X17 devices are connected to the LCD module and two (2) MCP23X08 devices are connected to the keypad matrix. A button on the keypad toggles between I

C and SPI mode. When in I2C mode, the MCP23017 and MCP23008 are controlled by the PIC MCU. When in SPI mode, the MCP23S17 and MCP23S08 are controlled. Only one (1) MCP23X08 and one (1) MCP23X17 is on the bus at a time.

2. The CONTROL BLOCK contains the PIC18F4550 and is the main intelligence in the system.

3. The INPUT BLOCK contains the 4x4 keypad matrix. The MCP23X08 devices are used to scan the keys.

4. The OUTPUT BLOCK contains the 2x16 LCD. The MCP23X17 devices control the display.

5. The MCP23X17 and MCP23X08 I/O and serial lines are routed to the HEADER BLOCK to allow the pins to be probed.

6. The PROGRAMMING BLOCK contains the ICSP™ header for programming/debugging the PIC18F4550.

7. The POWER BLOCK contains the MCP1702 5V voltage regulator. The board can be powered by a 9V supply (connected through the power jack) or by applying 5V directly to the power points.

GPIO Expander Keypad and LCD Demo Board User’s Guide

2.5 FIRMWARE DESCRIPTION

See Figure 2-3 for the main firmware flow diagram.

Main Function:

1. The firmware first configures the PIC MCU.

2. The MCP23X08 and MCP23X17 devices are configured. I selected first by default. The SPI devices I/O are held in reset.

3. The LCD splash screen is shown.

4. Wait for an interrupt from the MCP23X08. An interrupt will occur when a button is pressed. Four (4) inputs are configured to interrupt on falling edge. These inputs are for the “columns” of the keypad matrix.

5. After the interrupt occurs, the firmware calls the Scan_Buttons routine.

6. Then the Update_LCD routine.

Scan_Buttons Function:

1. Read INTCAP register. This register contains a snapshot of the port condition when the interrupt occurred.

2. Swap inputs and outputs so the rows can be read.

3. Read GPIO register and merge with variable containing INTCAP value.

4. The pressed key is determined by looking up the result in a lookup table.

C Devices are

Update_LCD Function:

1. The LCD is updated based on which button was pressed.

Installation and Operation

FIGURE 2-3: MAIN FIRMWARE FLOW

Start

Init_MCU

Init_MCP

Splash

GPIO INT Flag

Set?

YES

Scan_Buttons

Update_LCD

The MCP23X08 is configured to interrupt on falling edge for the columns (4 inputs)

After the interrupt, the column location of the button is known and is contained in INTCAP. Need to read GPIO to get the Row location.

Buttons: 0-9, #, * : Copied to the LCD

M: Toggle mode (SPI and I B: Backspace R: Carriage Return S: Space

C™)

GPIO Expander Keypad and LCD Demo Board User’s Guide

FIGURE 2-4: KEYPAD SCAN

Scan_Buttons

One nibble is set to input and the other nibble is output (to read the columns) (already configured before entering function).

Read INTCAP

Swap inputs and

outputs

Read INTCAP and place in a variable.

To read the rows.

Merge with variable containing INTCAP value.

The result can be looked up in a table (switch statement) to determine which key was pressed.

Read GPIO

Determine key

press from lookup

table

Set I/O back to

default so it is

correct the next

time the function is

called

END

FIGURE 2-5: LCD UPDATE

Installation and Operation

Update_LCD

The pressed button result comes from the variable in the Scan_Buttons function

1 - 9

Toggle Serial

Mode

(I2C or SPI)

Button Press?

Backspace Space

Carriage Return Display *

Display #Display

END

GPIO Expander Keypad and LCD Demo Board User’s Guide

NOTES:

Appendix A. Schematics and Board Layouts

A.1 INTRODUCTION

This appendix contains the schematic and PCB layout for the GPIO Expander Keypad and LCD Demo Board. Diagrams included:

• Board Schematics - Pages 1 - 3.

• Board - Top Layer (with silk screen)

• Board - Bottom Layer

GPIO EXPANDER KEYPAD

AND LCD DEMO BOARD

USER’S GUIDE

GPIO Expander Keypad and LCD Demo Board User’s Guide

A.2 BOARD SCHEMATIC - PAGE 1

Schematics and Board Layouts

A.3 BOARD SCHEMATIC - PAGE 2

GPIO Expander Keypad and LCD Demo Board User’s Guide

A.4 BOARD SCHEMATIC - PAGE 3

Schematics and Board Layouts

A.5 BOARD - TOP LAYER (WITH SILK SCREEN)

A.6 BOARD - BOTTOM LAYER

GPIO Expander Keypad and LCD Demo Board User’s Guide

NOTES:

GPIO EXPANDER KEYPAD

AND LCD DEMO BOARD

USER’S GUIDE

Appendix B. Bill Of Materials (BOM)

TABLE B-1: BILL OF MATERIALS

Qty

23 C1, C5, C6

1 C3 CAP CER .33UF 16V Y5V 0805 Murata Electronics

2 C16, C17 CAP 22PF 50V CERM CHIP 0805 SMD

1 C18 CAP .22UF 16V CERAMIC X7R 0805 Panasonic - ECG ECJ-2VB1C224K

4 D1, D2, D3, D4 LED 636NM SUPER RED 0805 SMD LITE-ON INC SML-LX0805SIC-TR

2 D5, D6 DIODE SCHOTTKY 20V 0.5A SOD123 ON Semiconductor

2 D7, D8 LED THIN 565NM GRN DIFF 0805

1 D9 RECT SCHOTTKY 1A 20V DO-214AA Micro Commercial Co. SMB5817-TP

4 EA Corner BUMPON X-TALL TAPER SQ

1 J1 *Do Not Populate* — —

1 J2 CONN POWER JACK 2.5MM PCB

1 J3 *Do Not Populate* — —

1 J4 *Do Not Populate* — —

2 J5, J10 *Do Not Populate* — —

1 J9 CONN USB RTANG FEMALE TYPE B

1 LCD1 LCD_2x16 Fema CG1626-SGR1

6 R1, R2, R3,

2 R4, R5 RES 270 OHM 1/8W 5% 0805 SMD Panasonic - ECG ERJ-6GEYJ271V

1 R6 RES 523 OHM 1/8W 1% 0805 SMD Yageo

2 R7, R54 RES 4.70K OHM 1/8W 1% 0805 SMD Yageo Corporation RC0805FR-074K7L

3 R24, R25, R35 RES 1.00K OHM 1/10W 1% 0805 SMD Panasonic - ECG ERJ-6ENF1001V

2 R29, R30 RES 0.0 OHM 1/8W 5% 0805 SMD Panasonic - ECG ERJ-6GEY0R00V

Note 1: The components listed in this Bill of Materials are representative of the PCB assembly. The released BOM

Reference

Designator

CAP 1UF 16V CERAMIC Y5V 0805 Panasonic C15, C25, C30, C31, C32, C33, C34, C35, C36, C37, C38, C39, C40, C41, C42, C43, C44, C45, C 4 6 , C 4 7 , C48

*Do Not Populate*

SMD

.81X.30BK

CIRC

PCB *Do Not Populate*

RES 10.0K OHM 1/10W 1% 0805 SMD Panasonic - ECG ERJ-6ENF1002V R8, R9, R53

used in manufacturing uses all RoHS-compliant components.

Description Manufacturer Part Number

- ECG ECJ-2VF1C105Z

GRM219F51C334ZA01D

North America

Panasonic - ECG ECJ-2VC1H220J

MBR0520LT1G

Optoelectronics SML-LXT0805GW-TR

3M/ESM SJ-5523 (BLACK)

CUI Inc PJ-102B

Assmann Electronics Inc

Corporation RC0805FR-07523RL

AU-Y1007-R

GPIO Expander Keypad and LCD Demo Board User’s Guide

TABLE B-1: BILL OF MATERIALS (CONTINUED)

Qty

16 R32, R33, R34,

1 R49 RES 33.2K OHM 1/8W 1% 0805 SMD Yageo

2 R50, R52 RES 475 OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF4750V

1 R51 RES 100K OHM 1/8W 5% 0805 SMD Panasonic - ECG ERJ-6GEYJ104V

17 S11, S12, S13,

1 TP1 TEST POINT PC MULTI PURPOSE

1 TP2 TEST POINT PC MULTI PURPOSE

1 U1 16 Bit I/O Expander with Serial Interface Microchip Technology

1 U2 8-Bit I/O Expander with SPI Interface Microchip Technology

1 U3 16 Bit I/O Expander with Serial Interface Microchip Technology

1 U4 8-Bit I/O Expander with I

1 U5 44-Pin, High-Performance, Enhanced

1U6 2 μA Low Dropout Positive Voltage

1 U7 MOSFET P-CH 20V 850MA SSOT3 Fairchild

1 Y1 CRYSTAL 20.0000 MHZ SERIES RES

Note 1: The components listed in this Bill of Materials are representative of the PCB assembly. The released BOM

Reference

Designator

Description Manufacturer Part Number

RES 100 OHM 1/10W 3900PPM

R36, R37, R38,

5%0805 R39, R40, R41, R42, R43, R44, R45, R46, R47, R48

SWITCH TACT 6MM SMD MOM 160GF Omron Electronics Inc B3S-1000 S14, S15, S16, S17, S18, S19, S20, S21, S22, S23, S24, S25, S26, S27

BLK

RED

C Interface Microchip Technology

Flash, USB Microcontroller

Regulator

*Do Not Populate*

used in manufacturing uses all RoHS-compliant components.

Panasonic - ECG ERA-S39J101V

Corporation RC0805FR-0733K2L

Keystone Electronics

5011

Keystone Electronics 5010

MCP23S17-E/SS

Inc

MCP23S08-E/SS

Inc

MCP23017-E/SS

Inc

MCP23008-E/SS

Inc

Microchip Technology

PIC18F4550

Inc

Microchip Technology

MCP1702T-5002I/CB

Inc

NDS352P

ATS200

Semiconductor

CTS-Frequency

Controls

NOTES:

Bill Of Materials (BOM)

WORLDWIDE SALES AND SERVICE

AMERICAS

Corporate Office

2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: http://support.microchip.com Web Address: www.microchip.com

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Boston

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Kokomo

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Santa Clara

Santa Clara, CA Tel: 408-961-6444 Fax: 408-961-6445

Toronto

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ASIA/PACIFIC

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Suites 3707-14, 37th Floor Tower 6, The Gateway Habour City, Kowloon Hong Kong Tel: 852-2401-1200 Fax: 852-2401-3431

Australia - Sydney

Tel: 61-2-9868-6733 Fax: 61-2-9868-6755

China - Beijing

Tel: 86-10-8528-2100 Fax: 86-10-8528-2104

China - Chengdu

Tel: 86-28-8665-5511 Fax: 86-28-8665-7889

China - Fuzhou

Tel: 86-591-8750-3506 Fax: 86-591-8750-3521

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Tel: 852-2401-1200 Fax: 852-2401-3431

China - Qingdao

Tel: 86-532-8502-7355 Fax: 86-532-8502-7205

China - Shanghai

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Tel: 86-27-5980-5300 Fax: 86-27-5980-5118

China - Xian

Tel: 86-29-8833-7250 Fax: 86-29-8833-7256

ASIA/PACIFIC

India - Bangalore

Tel: 91-80-4182-8400 Fax: 91-80-4182-8422

India - New Delhi

Tel: 91-11-4160-8631 Fax: 91-11-4160-8632

India - Pune

Tel: 91-20-2566-1512 Fax: 91-20-2566-1513

Japan - Yokohama

Tel: 81-45-471- 6166 Fax: 81-45-471-6122

Korea - Gumi

Tel: 82-54-473-4301 Fax: 82-54-473-4302

Korea - Seoul

Tel: 82-2-554-7200 Fax: 82-2-558-5932 or 82-2-558-5934

Malaysia - Penang

Tel: 60-4-646-8870 Fax: 60-4-646-5086

Philippines - Manila

Tel: 63-2-634-9065 Fax: 63-2-634-9069

Singapore

Tel: 65-6334-8870 Fax: 65-6334-8850

Taiwan - Hsin Chu

Tel: 886-3-572-9526 Fax: 886-3-572-6459

Taiwan - Kaohsiung

Tel: 886-7-536-4818 Fax: 886-7-536-4803

Taiwan - Taipei

Tel: 886-2-2500-6610 Fax: 886-2-2508-0102

Thailand - Bangkok

Tel: 66-2-694-1351 Fax: 66-2-694-1350

EUROPE

Austria - Wels

Tel: 43-7242-2244-39 Fax: 43-7242-2244-393

Denmark - Copenhagen

Tel: 45-4450-2828 Fax: 45-4485-2829

France - Paris

Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79

Germany - Munich

Tel: 49-89-627-144-0 Fax: 49-89-627-144-44

Italy - Milan

Tel: 39-0331-742611 Fax: 39-0331-466781

Netherlands - Drunen

Tel: 31-416-690399 Fax: 31-416-690340

Spain - Madrid

Tel: 34-91-708-08-90 Fax: 34-91-708-08-91

UK - Wokingham

Tel: 44-118-921-5869 Fax: 44-118-921-5820

10/19/06

Microchip Technology GPIODM-KPLCD User guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

INTRODUCTION

DOCUMENT LAYOUT

CONVENTIONS USED IN THIS GUIDE

RECOMMENDED READING

THE MICROCHIP WEB SITE

CUSTOMER SUPPORT

DOCUMENT REVISION HISTORY

Chapter 1. Product Overview

1.1 INTRODUCTION

1.2 WHAT IS THE GPIO EXPANDER KEYPAD AND LCD DEMO BOARD?

1.3 WHAT THE GPIO EXPANDER KEYPAD AND LCD DEMO BOARD KIT INCLUDES

Chapter 2. Installation and Operation

2.1 INTRODUCTION

2.2 FEATURES

2.3 GETTING STARTED

2.4 GPIO EXPANDER KEYPAD AND LCD DEMO BOARD DESCRIPTION

2.4.1 Major Board Components

2.5 FIRMWARE DESCRIPTION

Appendix A. Schematics and Board Layouts

A.1 INTRODUCTION

Appendix B. Bill Of Materials (BOM)

WORLDWIDE SALES AND SERVICE