Microchip Technology MCP23X17 User’s Guide

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MCP23X17

Evaluation Board

User’s Guide

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8-bit MCUs, KEELOQ

code hopping devices, Serial

MCP23X17 EVALUATION

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

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

1.2 What is the MCP23X17 Evaluation Board? .................................................... 5

1.3 What the MCP23X17 Evaluation Board Kit Includes ...................................... 5

Chapter 2. Installation and Operation

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

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

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

2.4 MCP23X17 Evaluation Board Description ...................................................... 9

2.5 Firmware Description ..................................................................................... 9

Appendix A. Schematic and Layouts

A.1 Introduction .................................................................................................. 11

A.2 Board Schematic (Page 1) ....................................................................... 12

A.3 Board Schematic (Page 2) ....................................................................... 13

A.4 Board Schematic (Page 3) ....................................................................... 14

A.5 Board - Top Layer (with silk screen) ......................................................... 15

A.6 Board - Bottom Layer ............................................................................... 16

Appendix B. Bill Of Materials (BOM)

Worldwide Sales and Service .................................................................................... 18

MCP23X17 Evaluation Board User’s Guide

NOTES:

MCP23X17 EVALUATION

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 MCP23X17 Evaluation 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 MCP23X17 Evaluation Board as a development tool to emulate and debug firmware on a target board. The manual layout is as follows:

• Chapter 1. “Product Overview” – Important information about the MCP23X17 Evaluation Board.

• Chapter 2. “Installation and Operation” – Includes instructions on how to get started with the MCP23X17 Evaluation Board.

• Appendix A. “Schematic and Layouts” – Shows the schematic and layout diagrams for the MCP23X17 Evaluation Board.

• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the MCP23X17 Evaluation Board.

MCP23X17 Evaluation 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® IDE User’s Guide

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

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: { | }

Ellipses... Replaces repeated text var_name [,

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

Represents code supplied by user

format,

“Save project before build”

4‘b0010, 2‘hF1

any valid filename

[options]

errorlevel {0|1}

var_name...]

void main (void) { ... }

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 B (August 2006)

• Add disclaimer to Bill of Materials regarding RoHS-Compliant part numbers.

Revision A (January 2006)

• Initial Release of this Document.

MCP23X17 Evaluation Board User’s Guide

NOTES:

MCP23X17 EVALUATION

BOARD USER’S GUIDE

Chapter 1. Product Overview

1.1 INTRODUCTION

This chapter provides an overview of the MCP23X17 Evaluation Board and covers the following topics:

• What is the MCP23X17 Evaluation Board?

• What the MCP23X17 Evaluation Board kit includes

1.2 WHAT IS THE MCP23X17 EVALUATION BOARD?

The MCP23X17 Evaluation Board allows the system designer to evaluate the operation of the MCP23X17 General Purpose I/O (GPIO) expander. The board demonstrates the MCP23X17 performance in a simple circuit (4 inputs and 12 outputs).

1.3 WHAT THE MCP23X17 EVALUATION BOARD KIT INCLUDES

This MCP23X17 Evaluation Board Kit includes:

• One MCP23X17 Evaluation Board

- MCP23017 GPIO Expander with I

- MCP23S17 GPIO Expander with SPI interface (installed)

• One AIPD Evaluation Board

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

- MCP23X17 Evaluation Board User’s Guide (DS51592)

C™ interface (installed)

MCP23X17 Evaluation Board User’s Guide

NOTES:

Chapter 2. Installation and Operation

2.1 INTRODUCTION

This chapter discusses the setup and operation of the MCP23X17 Evaluation Board.

The MCP23X17 Evaluation Board is designed to demonstrate simple, low-cost input/output expansion using the MCP23X17 devices and a low-cost PICmicro microcontroller.

Four MCP23X17 pins are configured as inputs and connected to four momentary push buttons. The remaining twelve GPIO pins are configured as outputs and connected to LEDs. Each button causes the LEDs to sequence in a predetermined pattern.

The MCP23X17 is provided in small, space-saving 18-lead SSOP packages.

2.2 FEATURES

The MCP23X17 Evaluation Board has the following features:

• Two 16-bit GPIO Expanders

- MCP23017 with I

- MCP23S17 with SPI interface

• Slide switch for selecting between the two GPIO expanders.

• Four momentary buttons and twelve LEDs, each connected to an individual GPIO pin to demonstrate the input/output functionality of the MCP23X17.

• Headers for the MCP23X17 pins to allow evaluation in a user defined application.

• Jumpers (not populated, but shorted by a trace on the bottom of the PCB) to isolate the MCP23X17 from the LEDs and buttons, so they can be evaluated in a custom circuit.

• Header for programming the PIC16F818.

C interface

MCP23X17 EVALUATION

BOARD USER’S GUIDE

MCP23X17 Evaluation Board User’s Guide

2.3 GETTING STARTED

The MCP23X17 Evaluation Board is a fully functional, assembled and tested board for evaluation of the MCP23017 (I

C interface) 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 5V power

supply to the V

and GND test points.

2. The green power LED will illuminate.

3. The device selector slide switch selects between the two devices. Slide the

switch towards the device of choice.

4. On power-up, the LEDs will sequence in a slow scroll pattern.

5. Press a button and the LED sequencing will match the function defined by the

button. For example, pressing the “Blink” button will cause the LEDs to continuously blink.

FIGURE 2-1: BOARD LAYOUT

LEDs

Jumpers: Shorted by default on PCB bottom

GPA/GPB Header

Power LED

VDD

GND

BLINK

Jumpers

Reset

ALT

MUX

Serial and INT

Pins Header

Selector Switch

PIC16F818

SCROLL

MCP23S17MCP23017

Installation and Operation

2.4 MCP23X17 EVALUATION BOARD DESCRIPTION

2.4.1 Major Board Components

1. MCP23017 and MCP23S17 - The two devices under evaluation/demonstration. Both devices are connected to the same inputs and outputs and selector switch is used to select which device the PICmicro controls. A mux is used to route the serial (I

2. LEDs - These are connected to the MCP23X17 GPIO configured as outputs.

3. Momentary Buttons - These are connected to the MCP23X17 configured as inputs.

4. PIC16F818 - Reads the selector switch and controls the MCP23X17 devices.

5. Headers - There are two headers which are connected to the MCP23X17 pins to allow off-board connections.

6. Jumpers - The jumpers are used to isolate the MCP23X17 pins so they can be connected to an off-board circuit. The jumpers are not populated, however, they are shorted by a trace on the bottom of the PCB.

7. Power - The boards can be powered by 9V via the power jack (J2) or by applying 5V directly to the power points (TP1 and TP2).

2.5 FIRMWARE DESCRIPTION

C or SPI) from the PICmicro to the MCP23X17.

See Figure 2-2 for the main firmware flow diagram

1. The firmware first configures the PIC16F818 microcontroller.

2. The firmware configures the MCP23X17 devices (4-inputs, 12-outputs, enable interrupts, etc.).

3. The firmware checks the selector switch to determine which MCP23X17 to communicate with during the main loop.

4. The “other” MCP23X17 is configured to all inputs so that it does not cause contention on LED connections.

5. The MCP23X17 inputs are sampled.

6. The LEDs light up in a pattern as defined by the button which was pressed. If no button is pressed, the LEDs maintain the current sequence.

MCP23X17 Evaluation Board User’s Guide

FIGURE 2-2: MAIN FIRMWARE FLOW

Start

Init_MCU

Init_MCP

Check Device

Selector Switch

Set Serial Mode to

SPI

Configure

MCP23S17 to

inputs so it does

not interfere

Set Serial Mode to

I2C

Set MCP23017

LED I/O to Output

23017

MCP23017 or

MCP23S17?

Read Inputs

Most

Recent Button

Pressed?

23S17

Set Serial Mode to

I2C™

Configure

MCP23017 to

inputs so it does

not interfere

Set Serial Mode to

SPI

Set MCP23S17

LED I/O to Output

Blink Alt Scroll KR

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

This appendix contains the schematic and PCB layout for the MCP23X17 Evaluation Board. Diagrams included:

• Board Schematics (pages 1 thru 3)

• Board - Top Layer (with silk screen)

• Board - Bottom Layer

MCP23X17 EVALUATION

BOARD USER’S GUIDE

MCP23X17 Evaluation Board User’s Guide

A.2 BOARD SCHEMATIC (PAGE 1)

103-00071

C D

NC3

OFF

NO1

OFF

0ON

1ON

IN1/IN3

A B D

A.3 BOARD SCHEMATIC (PAGE 2)

Schematic and Layouts

103-00071

C D

A B D

MCP23X17 Evaluation Board User’s Guide

A.4 BOARD SCHEMATIC (PAGE 3)

103-00071

C D

POWER

A B D

Schematic and Layouts

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

MCP23X17 Evaluation Board User’s Guide

A.6 BOARD - BOTTOM LAYER

MCP23X17 EVALUATION

BOARD USER’S GUIDE

Appendix B. Bill Of Materials (BOM)

TABLE B-1: BILL OF MATERIALS (BOM)

Qty Reference Description Manufacturer Part Number

9 C1,C2,C4,C5,

C6,C7C8,C9, C10

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

1 D1 RECT SCHOTTKY 1A 20V DO-214AA Micro Commercial Co. SMB5817-TP

12 D2 -D13 LED RED 635NM PLCC 120DEG LITE-ON INC. LTST-T670EKT

1 D14 LED GREEN 565NM PLCC 120DEG LITE-ON INC. LTST-T670GKT

16 JMP1- JMP16 Do Not populate — —

1 J1 Do Not populate — —

1 J4 Do Not populate — —

1 J3 Do Not populate — —

1 J2 CONN POWER JACK 2.5MM PCB CIRC CUI Inc. PJ-102B

1 U7 18/20-Pin Enhanced Flash Microcontrol-

12 R11 - R22 RES 475 OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF4750V

6 R4 -R9 RES 0.0 OHM 1/8W 5% 0805 SMD Panasonic - ECG ERJ-6GEY0R00V

3 R1,R28,

R29

4 R24 -R27 RES 100 OHM 1/8W 1% 0805 SMD Panasonic - ECG ERJ-6ENF1000V

1 R23 RES 475 OHM 1/8W 1% 0805 SMD Panasonic - ECG ERJ-6ENF4750V

1 S6 SWITCH,SLD,MIN,SPDT,ON-ON, JAMECO VALUEPRO G4050X

5 S1-S5 SWITCH TACT 6MM SMD MOM 160GF Omron Electronics Inc. B3S-1000

1 TP1 TEST POINT PC MULTI PURPOSE BLK Keystone Electronics 5011

1 TP2 TEST POINT PC MULTI PURPOSE RED Keystone Electronics 5010

1 U1 IC POSITIVE REGULATOR 5V D2PAK STMicroelectronics L7805CD2T-TR

1 U3 IC QUAD BILATERAL SWITCH

1 U4 16 Bit I/O Expander with Serial Interface Microchip Technology

1 U2 16 Bit I/O Expander with Serial Interface Microchip Technology

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

used in manufacturing uses all RoHS-compliant components.

CAP .1UF 16V CERAMIC X7R 0805 Panasonic - ECG ECJ-2VB1C104K

GRM219F51C334ZA01D

North America

Microchip Technology

lers with nanoWatt Technology

RES 10.0K OHM 1/8W 1% 0805 SMD Panasonic - ECG ERJ-6ENF1002V

14TSSOP

Inc.

Texas Instruments CD74HC4066PWR

Inc.

PIC16F818

MCP23S17-E/SS

MCP23017-E/SS

WORLDWIDE SALES AND SERVICE

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

Thailand - Bangkok

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EUROPE

Austria - Wels

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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

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Italy - Milan

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Netherlands - Drunen

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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

07/21/06

Microchip Technology MCP23X17 User’s 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 MCP23X17 EVALUATION BOARD?

1.3 WHAT THE MCP23X17 EVALUATION BOARD KIT INCLUDES

Chapter 2. Installation and Operation

2.1 INTRODUCTION

2.2 FEATURES

2.3 GETTING STARTED

2.4 MCP23X17 EVALUATION BOARD DESCRIPTION

2.5 FIRMWARE DESCRIPTION

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

Appendix B. Bill Of Materials (BOM)

WORLDWIDE SALES AND SERVICE