Microchip Technology MCP3903 Manual de usuario

MCP3903

ADC Evaluation Board

for 16-Bit MCUs

User’s Guide

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and may be superseded by updates.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.

Trademarks

The Microchip name and logo, the Microchip logo, dsPIC,

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

PIC32 logo, rfPIC and UNI/O are registered trademarks of

Microchip Technology Incorporated in the U.S.A. and other

countries.

FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor,

MXDEV, MXLAB, SEEVAL and The Embedded Control

Solutions Company are registered trademarks of Microchip

Technology Incorporated in the U.S.A.

Analog-for-the-Digital Age, Application Maestro, chipKIT,

chipKIT logo, CodeGuard, dsPICDEM, dsPICDEM.net,

dsPICworks, dsSPEAK, ECAN, ECONOMONITOR,

FanSense, HI-TIDE, In-Circuit Serial Programming, ICSP,

Mindi, MiWi, MPASM, MPLAB Certified logo, MPLIB,

MPLINK, mTouch, Omniscient Code Generation, PICC,

PICC-18, PICDEM, PICDEM.net, PICkit, PICtail, REAL ICE,

rfLAB, Select Mode, Total Endurance, TSHARC,

UniWinDriver, WiperLock and ZENA are trademarks of

Microchip Technology Incorporated in the U.S.A. and other

countries.

SQTP is a service mark of Microchip Technology Incorporated

in the U.S.A.

All other trademarks mentioned herein are property of their

respective companies.

Printed on recycled paper.

ISBN: 978-1-61341-426-2

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

• Microchip products meet the specification contained in their particular Microchip Data Sheet.

• 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.

• 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.

Microchip received ISO/TS-16949:2009 certification for its worldwide

headquarters, design and wafer fabrication facilities in Chandler and

Tempe, Arizona; Gresham, Oregon and design centers in California

and India. The Company’s quality system processes and procedures

are for its PIC®MCUs and dsPIC®DSCs, KEELOQ®code hopping

devices, Serial EEPROMs, microperipherals, nonvolatile memory and

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

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

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 dsPIC33 Example Description ...................................................................... 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 - Microcontroller (MCU) ..............................................................19

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

A.7 Schematic - Power .......................................................................................21

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

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

A.10 Board - Layer #2 VDD ................................................................................ 23

A.11 Board - Layer #3 GND ............................................................................... 23

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

A.13 Board - Bottom SILK and PADS ................................................................ 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

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. “Hardware Description”– 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.

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.

MCP3903 ADC Evaluation Board for 16-Bit MCUs 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 “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

N‘Rnnnn A number in verilog format,

where N isthe total number of

digits, R is the radix and n is a

digit.

4‘b0010, 2‘hF1

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

Courier New font:

Plain Courier New 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

Constants 0xFF, ‘A’

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

any valid filename

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)

{ ...

}

Preface

RECOMMENDED READING

This User's Guide describes how to use MCP3903 ADC Evaluation Board for 16-Bit

MCUs. Other useful documents are listed below. The following Microchip document is

available and recommended as a supplemental reference resource:

• MCP3903 Data Sheet - “Six Channel Delta Sigma A/D Converter”

(DS25048B)

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

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:

MCP3903 ADC EVALUATION BOARD

FOR 16-BIT MCUs USER’S GUIDE

Chapter 1. Hardware Description

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

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

PC Software Interface and LCD

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

performance. The ADC can run up to 64 ksps.

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

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

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

allowing low noise evaluation of the MCP3903 devices. Separate power supplies

and power planes - 4 layer board.

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

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

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

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