Microchip Technology MCP2030 Bidirectional Communication Demo Kit User guide

MCP2030

Bidirectional Communication

Demo Kit

User’s Guide

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code hopping devices, Serial EEPROMs,

MCP2030 BIDIRECTIONAL

COMMUNICATION DEMO KIT

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 ................................................................................... 4

Chapter 1. Quick Start .................................................................................................. 5

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

Chapter 2. System Overview ........................................................................................ 7

2.1 Overview ........................................................................................................ 7

2.2 Operational Overview ..................................................................................... 8

2.3 Features ....................................................................................................... 10

Chapter 3. Hardware and Firmware Overview .......................................................... 11

3.1 Introduction ................................................................................................... 11

3.2 MCP2030 Base Station Demo Board ........................................................... 11

3.3 MCP2030 Transponder Demo Board ........................................................... 14

Appendix A. Schematic and Layouts ........................................................................ 19

A.1 Introduction .................................................................................................. 19

A.2 Transponder Demo Board - Schematic ...................................................... 20

A.3 Transponder Demo Board - Top Layer and Silk Screen ............................ 21

A.4 Transponder Demo Board - Bottom Layer ................................................. 21

A.5 Base Station Demo Board - Schematic (Page 1) ..................................... 22

A.6 Base Station Demo Board - Schematic (Page 2) ..................................... 23

A.7 Base Station Demo Board - Top Layer and Silk Screen .......................... 24

A.8 Base Station Demo Board - Bottom Layer ............................................... 24

Appendix B. Bill of Materials (BOM) .......................................................................... 25

B.1 Introduction .................................................................................................. 25

Worldwide Sales and Service .................................................................................... 30

MCP2030 Bidirectional Communication Demo Kit User’s Guide

NOTES:

MCP2030 BIDIRECTIONAL

COMMUNICATION DEMO KIT

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.

For the most up-to-date information on development tools, see the MPLAB Select the Help menu, and then Topics to open a list of available on-line help files.

IDE on-line help.

INTRODUCTION

This chapter contains general information that will be useful to know before using the MCP2030 Bidirectional Communication Demo Kit. Items discussed in this chapter include:

• Document Layout

• Conventions Used in this Guide

• Recommended Reading

• The Microchip Web Site

• Customer Support

DOCUMENT LAYOUT

This document describes the MCP2030 Bidirectional Communication Demo Kit. The manual layout is as follows:

• Chapter 1. “Quick Start” – Describes the MCP2030 Bidirectional

Communication Demo Kit set-up instructions.

• Chapter 2. “System Overview” – A system overview of the MCP2030

Bidirectional Communication Demo Kit is discussed.

• Chapter 3. “Hardware and Firmware Overview” – Describes the MCP2030

Bidirectional Communication Demo Kit hardware and firmware.

• Appendix A. “Schematic and Layouts” – Shows the schematic and board

layouts for the MCP2030 Bidirectional Communication Demo Kit.

• Appendix B. “Bill of Materials (BOM)” - Lists the parts used to build the demo

boards that make up MCP2030 Bidirectional Communication Demo Kit.

MCP2030 Bidirectional Communication Demo Kit User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Code (Courier font):

Plain characters Sample code

Filenames and paths

Angle brackets: < > Variables <label>, <exp>

Square brackets [ ] Optional arguments MPASMWIN [main.asm]

Curly brackets and pipe character: { | }

Lowercase characters in quotes

Ellipses... Used to imply (but not show) addi-

0xnnn A hexadecimal number where n is a

Italic characters A variable argument; it can be either a

Interface (Arial font):

Underlined, italic text with right arrow

Bold characters A window or dialog button to click OK, Cancel

Characters in angle brackets < >

Documents (Arial font):

Italic characters Referenced books MPLAB

Choice of mutually exclusive arguments; An OR selection

Type of data

tional text that is not relevant to the example

hexadecimal digit

type of data (in lowercase characters) or a specific example (in uppercase characters).

A menu selection from the menu bar File > Save

A key on the keyboard <Tab>, <Ctrl-C>

#define START c:\autoexec.bat

errorlevel {0|1}

“filename”

list [“list_option...,

“list_option”]

0xFFFF, 0x007A

char isascii (char, ch);

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 Guide, 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

MCP2030 Bidirectional Communication Demo Kit User’s Guide

DOCUMENT REVISION HISTORY

Revision A (December 2006)

• Initial Release of this Document.

1.1 INTRODUCTION

This section provides the user a quick step-by-step instruction guide on how to set-up the MCP2030 Bidirectional Communication Demo Kit.

1.1.1 Transponder Unit

Connect power to the Transponder unit by inserting a 3V NiHM (CR2032) battery to the battery holder in the bottom side of the Transponder. When the Transponder is powered on, it is waiting for a 125 kHz low frequency (LF) command from the Base Station unit. On the PCB, there are three LF antenna coils: One large air-core coil on the bottom side and two ferrite-core coils on the top side. These three coils detect 125 kHz low frequency (LF) signals from x, y, and z directions. The Transponder also has a SAW (Surface Acoustic Wave) based UHF transmitter. A rectangular loop trace on the PCB is the UHF antenna. The Transponder has two LED diodes. A green LED (D6) will blink when the Transponder receives a valid LF command, and a red LED (D7) will blink when it transmitting an UHF response.

MCP2030 BIDIRECTIONAL

COMMUNICATION DEMO KIT

USER’S GUIDE

Chapter 1. Quick Start

Top Sid e

UHF

Antenna

125 kHz

Air Core

Antenna Coil

PICkit™ 2 Debug Express

Bottom Side

3V Lithium Battery

MCP2030 Bidirectional Communication Demo Kit User’s Guide

1.1.2 Base Station Unit:

Supply power to the Base Station unit with a 9V - 18V power supply. As soon as the power is supplied, the LED D2 will light on, and the unit starts transmitting an LF command.The unit also waits for the responses from the Transponder at any time, except during the transmission of the LF command. When the unit receives a valid response from the Transponder, the LED D3 will blink and the received Transponder ID and RSSI (Received Signal Strength Indicator) value will be displayed on the LCD.

MPLAB® ICD 2

Programming Jack

9V Power Supply

UHF Antenna

UHF Receiver Module

125 kHz LF

Antenna

1.1.3 When both the Base Station and Transponder units are powered-on:

When the two units are powered-on, they will communicate by themselves. The Base Station sends a 125 kHz LF command and the Transponder responds to the command. When the Transponder is placed within about 2 meters to the Base Station unit, the two units may have a successful communication with each other and the Base Station unit will display the received Transponder ID and RSSI value on the LCD. This is called a bidirectional communication. User can test the RSSI by moving the Transponder within the Base Station’s LF field. The RSSI value will increase as the Transponder comes closer to the Base Station antenna and decrease as moves away from it. The two units are communicating with each other as long as the boards are powered. You can also test one directional communication from the Transponder to the Base Station unit by pressing button switch (SW3 or SW4) on the Transponder. The range of the one directional communication is about 20 meters.

This MCP2030 Bidirectional Communication Demo Kit shows you how to create a smart hands-free bidirectional communication system using the stand-alone MCP2030 and microcontroller. All MCU firmware used for both the Transponder and Base Station units are included in the CD ROM provided with the MCP2030 Bidirectional Communication Demo Kit. The user can easily modify the firmware for their own applications.

2.1 OVERVIEW

This section describes how to use the MCP2030 Bidirectional Communication Demo Kit.

The MCP2030 Bidirectional Communication Demo Kit consists of two Transponders and a Base Station unit. The Transponder consists of an MCP2030 (stand-alone three-axis analog front-end device), a PIC16F636, and an MCP3421(18-bit delta-sigma analog-to-digital converter). Unlike the existing PKE Reference Design System (P/N: APGRD001) from Microchip Technology Inc., this Transponder uses stand-alone devices for the bidirectional passive keyless entry (PKE) operation. This system also demonstrates the received signal strength indicator (RSSI) function using the MCP3421 delta-sigma ADC. When the Transponder receives a Base Station command, it transmits its ID and sampled RSSI value. By monitoring or mapping the RSSI values, the user can estimate location or motion of the transponder with respect to the Base Station unit. For example, for the automotive passive keyless entry (PKE) applications, the Base Station mounted inside the vehicle can determine whether the transponder is located inside or outside of the vehicle, or in the front or back seat in the vehicle.

The Base Station unit consists of a PIC18F4680, a low frequency (LF) power amplifier, an LF receiver section, a 434 MHz UHF receiver module, an LCD display, and CAN/LIN transceiver sections. The components in the LF receiver section and the CAN/LIN transceiver sections are populated on the PCB for future use, but their functions are not utilized for this demo version. Any user who needs these features can contact Microchip Technology Inc. for further information.

The MCP2030 Bidirectional Communication Demo Kit has been designed for easy modification by customers. The firmware of both the Transponder and Base Station units can be easily modified using the MPLAB

MCP2030 BIDIRECTIONAL

COMMUNICATION DEMO KIT

Chapter 2. System Overview

in-circuit serial programmers.

USER’S GUIDE

Response

LCD

434 MHz AM

Receiver

(PIC18F4680)

Microcontroller

Base Station Transponder

Transmitter/

Receiver

LED

125 kHz LC Series Resonant Circuit

LF Command

(125 kHz)

(UHF)

Ant. X

Ant. Y

Ant. Z

125 kHz LC Parallel Resonant Circuit

434 MHz

Transmitter

(PIC16F636)

(MCP2030)

Analog Front-End

LED

Button

MCU

ADC

(MCP3421)

FIGURE 2-1: MCP2030 Bidirectional Communication System Block Diagram.

+ 23 hidden pages

Microchip Technology MCP2030 Bidirectional Communication Demo Kit 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

1.1 INTRODUCTION

Chapter 1. Quick Start

Chapter 2. System Overview