Microchip Technology MCP3903 User guide

MCP3903

ADC Evaluation Board

for 16-Bit MCUs

User’s Guide

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 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.

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EELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART,

PIC

logo, rfPIC and UNI/O are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

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Printed on recycled paper.

ISBN: 978-1-61341-426-2

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MCUs and dsPIC® DSCs, KEELOQ

code hopping

MCP3903 ADC EVALUATION BOARD

FOR 16-BIT MCUs USER’S GUIDE

Table of Contents

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

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

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

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

Recommended Reading.............................................................. .. ........................3

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

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

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

Chapter 1. Hardware Description

1.1 Overview ............. ........................................................................................... 5

1.2 PIM Module / MCP3903 Connection and Peripheral Usage Overview ..........7

1.3 Analog Input Structure ......................................... ...........................................9

1.4 USB to Serial Converter ................................................................................. 9

Chapter 2. Code Example

2.1 dsPIC3 3 Examp le D e sc ription . .. .................................................................. . 11

Appendix A. Schematics and Layouts

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

A.2 Schematic - Analog .. .. .. .......................... ... .. ................................................. 16

A.3 Schematic - LCD and UART .......................................................................17

A.4 Schematic - USB and Memory .....................................................................18

A.5 Schematic - Microcontro lle r (MCU) .. .. ........................... .. .. ........................... 19

A.6 Schematic - PIM Module ..............................................................................20

A.7 Schematic - Power ... .. .................................................................................. 2 1

A.8 Board - Top Trace and Top Silk .............................. .......................... ...........22

A.9 Board - Bottom Trace and Bottom Silk ........................................................22

A.10 Board - Lay e r # 2 VD D ......... .......................... .. ... ........................................ 23

A.11 Board - Lay e r # 3 GN D ........ ....................................................................... 23

A.12 Board - Top SILK and PADS ........................................... .. .. ......................24

A.13 Board - Bot to m S IL K a n d PA D S ................................................................ 24

Appendix B. Bill of Materials (BOM)

Worldwide Sales and Service ....................................................................................28

MCP3903 ADC Evaluation Board for 16-Bit MCUs User’s Guide

MCP3903 ADC EVALUATION BOARD

FOR 16-BIT MCUs 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 p age 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 MCP3903 ADC Evaluation Board for 16-Bit MCUs. 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 MCP3903 ADC Evaluation Board for 16-Bit MCUs as a development tool to emulate and debug firmware on a target board. The manual layout is as follows:

• Chapter 1. “Hardwa re Desc ript ion ”– Provides important information about the hardware.

• Chapter 2. “Code example ”– Describes the firmware.

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

• Appendix B. “Bill of Materials (BOM)” – Lists the parts used to build the MCP3903 ADC Evaluation Board for 16-Bit MCUs.

MCP3903 ADC Evaluation Board for 16-Bit MCUs User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following docum entat io n conven tion s:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic chara c ters 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 brac kets < > 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 r epeated text var_name [,

A menu path File>Save

A tab Click the Power tab

where N is the tota l number of digits, R is th e radi x 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 mut ually exclus ive arguments; an OR selection

Represents code supplied by user

“Save project before build”

4‘b0010, 2‘hF1

any valid filename

[options] errorlevel {0|1}

var_name...] void main (void)

{ ... }

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

Preface

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative

• Local Sales Office

• Field Application Engineer (FAE)

• Technical Support

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.

DOCUMENT REVISION HISTORY

Revision A (July 2011)

• Initial Release of this Document.

MCP3903 ADC Evaluation Board for 16-Bit MCUs User’s Guide

NOTES:

1.1 OVERVIEW

The MCP3903 ADC Evaluation Board for 16-Bit MCUs system lets users evaluate the performance of the MCP3903 six-channel ADC. It also provides a development platform for 16-bit PIC compatible with the Explorer-16 and other high pincount PIC demo boards. The system comes with programmed PIC24FJ128GA010 PIM modules that communicate with the LabView GUI for data exchange and ADC setup.

1.1.1 Feature Highlights

• Six-channel ADC MCP3903 output display using serial communication to the

• Simultaneous 4 ksps at 91 dB Signal-to-Noise and Distortion Ratio (SINAD)

• System and ADC performance analysis through graphical PC tools showing Time

• Robust hardware design with analog grounding and analog/digital separation,

• Pigtail Plus connectors for Explorer-16 daughter board compatibility.

MCP3903 ADC EVALUATION BOARD

FOR 16-BIT MCUs USER’S GUIDE

Chapter 1. Hardware Description

MCU-based applications, using existing 100-pin PIM systems,

PC Software Interface and LCD

performance. The ADC can run up to 64 ksps.

domain scope plot, Frequency Domain (FFT), and statistical numerical analysis.

allowing low noise evaluation of the MCP3903 devices. Separate power supplies and power planes - 4 layer board.

MCP3903 ADC Evaluation Board for 16-Bit MCUs User’s Guide

FIGURE 1-1: MCP3903 ADC Evaluation Board for 16-Bit MCUs.

+ 22 hidden pages

Microchip Technology MCP3903 User guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Trademarks

Preface

INTRODUCTION

DOCUMENT LAYOUT

CONVENTIONS USED IN THIS GUIDE

RECOMMENDED READING

THE MICROCHIP WEB SITE

CUSTOMER SUPPORT

DOCUMENT REVISION HISTORY

1.1 OVERVIEW

Chapter 1. Hardware Description