Microchip Technology PICtail Manuel utilisateur

2004 Microchip Technology Inc. DS51523A

Mixed Signal

PICtail™ Demo Board

User’s Guide

DS51523A-page ii 2004 Microchip Technology Inc.

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and may be superseded by updates.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.

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FanSense, FlexROM, fuzzyLAB, In-Circuit Serial

Programming, ICSP, ICEPIC, MPASM, MPLIB, MPLINK,

MPSIM, PICkit, PICDEM, PICDEM.net, PICLAB, PICtail,

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

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• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the

intended manner and under normal conditions.

• 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

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• 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

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Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our

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analog products. In addition, Microchip’s quality system for the design

and manufacture of development systems is ISO 9001:2000 certified.

Mixed Signal PICtail™ Demo

Board User’s Guide

2004 Microchip Technology Inc. DS51523A-page iii

Table of Contents

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

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

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

1.2 Purpose and Utility of the Mixed Signal PICtail™ Demo Board ..................... 5

1.3 Contents of the Mixed Signal PICtail™ Demo Board Kit ................................ 5

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

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

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

2.3 Getting Started ............................................................................................... 7

2.4 Running the demos ...................................................................................... 13

Appendix A. Schematics and Layouts ...................................................................... 17

A.1 Introduction .................................................................................................. 17

Appendix B. Bill-Of-Materials (BOM) ......................................................................... 25

Appendix C. MixedSignal_V100.asm Description .................................................... 27

Appendix D. DAC_dtmf.asm Source Code ............................................................... 29

Appendix E. MixedSignal_16f767i.lkr Source Code ................................................. 39

Appendix F. DTMF Scope Captures .......................................................................... 41

Appendix G. Scope Probe Noise Captures ............................................................... 43

Appendix H. Sine Wave and Filtered DTMF Scope Captures ................................. 45

Appendix I. MPLAB®IDE Screen Capture ................................................................ 47

Worldwide Sales and Service .................................................................................... 48

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page iv 2004 Microchip Technology Inc.

NOTES:

Mixed Signal PICtail™ Demo

Board User’s Guide

2004 Microchip Technology Inc. DS51523A-page 1

Preface

INTRODUCTION

This chapter contains general information that will be useful to know before using the

Mixed Signal PICtail™ Demo Board. Items discussed in this chapter include:

• About This Guide

• Conventions Used in this Guide

• Recommended Reading

• The Microchip Web Site

• Customer Support

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®IDE

on-line help. Select the Help menu, and then Topics to open a list of available on-line

help files.

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 2 2004 Microchip Technology Inc.

ABOUT THIS GUIDE

Document Layout

This document describes how to use the Mixed Signal PICtail™ Demo Board. The

manual layout is as follows:

•Chapter 1. Product Overview – Important information about the Mixed Signal

PICtail™ Demo Board.

•Chapter 2. Installation and Operation – Includes instructions on how to get

started with this demo board and a detailed description of each function of the

demo board.

•Appendix A. Schematics and Layouts – Shows the schematic and layout

diagrams for the Mixed Signal PICtail™ Demo Board.

•Appendix B. Bill-Of-Materials (BOM) – Lists the parts used to build the Mixed

Signal PICtail™ Demo Board.

•Appendix C. MixedSignal_V100.asm Description – Example “Main” assembly

firmware for the PIC16F767-I/SS microcontroller used to demonstrate the various

features of the supported analog products.

•Appendix D. DAC_dtmf.asm Source Code – Example assembly source

firmware used to generate Dual Tone Multiple Frequency (DTMF) signals. This

firmware is utilized by the “Main” firmware, MixedSignal_v100.ASM.

•Appendix E. MixedSignal_16f767i.lkr Source Code – Linker script file used to

build the example PIC16F767 firmware.

•Appendix F. DTMF Scope Captures – Oscilloscope screen captures of the

various DTMF tones displaying their FFT to illustrate the quality of the DTMF

tones.

•Appendix G. Scope Probe Noise Captures – Isolating scope probe noise is

challenging. These scope captures illustrate the difference between using a

standard scope probe and using coaxial cable directly from the board into the

scope.

•Appendix H. Sine Wave and Filtered DTMF Scope Captures – Oscilloscope

screen capture of the 32-step sine wave routine and the DTMF waveform. The

DTMF waveform illustrates the non-filtered DAC output and a simple RC-filtered

output.

•Appendix I. MPLAB® IDE Screen Capture – MPLAB IDE 6.3x was used to gen-

erate the example source firmware. This screen capture illustrates the tool, the

project files and the included Watch windows.

Preface

2004 Microchip Technology Inc. DS51523A-page 3

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

“Save project before build”

Underlined, italic text with

right angle bracket

A menu path File>Save

Bold characters A dialog button Click OK

A tab Click the Power tab

‘bnnnn A binary number where nis a

digit

‘b00100, ‘b10

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

Courier font:

Plain Courier Sample source code #define START

Filenames autoexec.bat

File paths c:\mcc18\h

Keywords _asm, _endasm, static

Command-line options -Opa+, -Opa-

Bit values 0, 1

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

any valid filename

0xnnnn A hexadecimal number where

nis a hexadecimal digit

0xFFFF, 0x007A

Square brackets [ ] Optional arguments mcc18 [options] file

[options]

Curly brackets and pipe

character: { | }

Choice of mutually exclusive

arguments; an OR selection

errorlevel {0|1}

Ellipses... Replaces repeated text var_name [,

var_name...]

Represents code supplied by

user

void main (void)

{ ...

}

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 4 2004 Microchip Technology Inc.

RECOMMENDED READING

This user's guide describes how to use the Mixed Signal PICtail™ Demo Board. Other

useful documents are listed below. The following Microchip documents are available

and recommended as supplemental reference resources.

MCP4921/22, “12-Bit DAC with SPI™ Interface” Data Sheet (DS21897)

Provides detailed information regarding the MCP492X devices.

TC1320, “8-Bit Digital-to-Analog Converter with Two-Wire Interface” Data Sheet

(DS21386)

Provides detailed information regarding the TC1320 device.

TC1321, “10-Bit Digital-to-Analog Converter with Two-Wire Interface” Data Sheet

(DS21387)

Provides detailed information regarding the TC1321 device.

MCP3302/3304, “13-Bit Plus Sign Differential Input 2.7V Low-Power A/D

Converter with SPI™ Serial Interface” Data Sheet (DS21697)

Provides detailed information regarding the MCP3302 and MCP3304 devices.

MCP3204/3208, “2.7V 12-Bit A/D Converters with SPI™ Serial Interface” Data

Sheet (DS21298)

Provides detailed information regarding the MCP3204 and MCP3208 devices.

MCP1525/1541, “2.5V and 4.096V Voltage Reference” Data Sheet (DS21653)

Provides detailed information regarding the MCP1525 and MCP1541 devices.

TC55, “1 µA Low-Dropout Positive Voltage Regulator” Data Sheet (DS21653)

Provides detailed information regarding the TC55 device.

MCP1700, “Low-Quiescent Current LDO” Data Sheet (DS21826)

Provides detailed information regarding the MCP1700 device.

MCP616/617/618/619, “2.3V to 5.5V Micropower Bi-CMOS Op Amps” Data Sheet

(DS21613)

Provides detailed information regarding the MCP616, MCP617, MCP618 and MCP619

devices.

PIC16F737, PIC16F747, PIC16F767, PIC16F777, “PIC16F7X7 Data Sheet”

(DS30498)

Provides detailed information regarding the PIC16F737, PIC16F747, PIC16F767 and

PIC16F777 devices.

Preface

2004 Microchip Technology Inc. DS51523A-page 5

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 (FAQ), technical

support requests, online discussion groups and 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

(FAE) 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

In addition, there is a Development Systems Information Line which lists the latest

versions of Microchip's development systems software products. This line also

provides information on how customers can receive currently available upgrade kits.

The Development Systems Information Line numbers are:

1-800-755-2345 – United States and most of Canada

1-480-792-7302 – Other International Locations

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 6 2004 Microchip Technology Inc.

NOTES:

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