Microchip Technology MCP3423 Manuel utilisateur

MCP3423

Evaluation Board

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and may be superseded by updates.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

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ECONOMONITOR, FanSense, In-Circuit Serial

Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB

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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.

• 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.

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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.

MCP3423 EVALUATION BOARD

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. Quick Start Instructions

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

1.2 Description of the MCP3423 Evaluation Board .............................................. 5

1.3 Getting Started with PICkit Serial Analyzer .................................................... 6

1.4 Experiment for CH2 ...................................................................................... 22

Appendix A. Schematic and Layouts

A.1 Introduction .................................................................................................. 23

A.2 Board – Schematic ....................................................................................... 24

A.3 Board – Top Laer ......................................................................................... 25

A.4 Board – Top Metal Layer ............................................................................. 26

A.5 Board – Bottom Layer .................................................................................. 27

A.6 Board – Bottom Metal Layer ........................................................................ 28

Appendix B. Bill of Materials (BOM)

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

MCP3423 Evaluation Board User’s Guide

NOTES:

MCP3423 EVALUATION BOARD

USER’S GUIDE

Preface

INTRODUCTION

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

MCP3423 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 MCP3423 Evaluation Board as a

development tool to emulate and debug firmware on a target board. The manual layout

is as follows:

•Chapter 1. “Quick Start Instructions” – this chapter provides an overview of the

MCP3423 Evaluation Board and instructions on how to use the MCP3423

Evaluation Board with the PICkit Serial Analyzer.

•Appendix A. “Schematic and Layouts” – shows the schematic and layout

diagrams for the MCP3423 Evaluation Board.

•Appendix B. “Bill of Materials (BOM)” – lists the parts used to build the

MCP3423 Evaluation Board.

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.

MCP3423 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

“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 is the 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 MCP3423 Evaluation Board. Other useful

documents are listed below. The following Microchip document is available and

recommended as supplemental reference resources:

PICkit™ Serial Analyzer User’s Guide (DS51647)

Consult this document for instructions on how to use the PICkit Serial Analyzer

hardware and software.

MCP3422/3/4 Data Sheet, “18-Bits, Multi-Channel Delta-Sigma Analog-to-Digital

Converter with I2C Interface and On-Board Reference” (DS22088)

This data sheet provides detailed information regarding the MCP3423 product family.

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 (November 2008)

• Initial Release of this Document.

MCP3423 Evaluation Board User’s Guide

NOTES:

MCP3423 EVALUATION BOARD

USER’S GUIDE

Chapter 1. Quick Start Instructions

1.1 INTRODUCTION

The following sections provide an overview of the MCP3423 Evaluation Board and

demonstrate how to use it with the PICkit™ Serial Analyzer (P/N: DV164122).

The following topics are covered:

• Description of the MCP3423 Evaluation Board

• How to use MCP3423 Evaluation Board with the PICkit Serial Analyzer

1.2 DESCRIPTION OF THE MCP3423 EVALUATION BOARD

The MCP3423 Evaluation Board (P/N MCP3423EV) contains a MCP3423 18-Bit ΔΣ

Analog-to-Digital Converter (ADC). The MCP3423 is a 2-channel 18 bit delta-sigma

ADC device with various configuration options. The board has analog input connection

pads and various test pads.

The user can connect inputs and test the conversion results using the PICkit Serial

Analyzer and its PC graphic user interface (GUI). The MCP3423 Evaluation Board has

the following interfaces:

• PICkit Serial Analyzer (P/N: DV164122) for writing configuration register bits and

reading the conversion data.

The board has test points for SDL, SDA, and analog inputs. By connecting an

oscilloscope to these test points, the user can examine the data communications

through the I2C™bus line and observe the resulting conversion output. Refer to

Appendix A. “Schematic and Layouts”.

1.2.1 I2C Address Bits and A0 Address Bit Selection

The I2C device code and address bits of the MCP3423 device are:

• Device Code: ‘1101’

• A2, A1, A0 Address Bits: determined by the JP2 (Adr1 pin) and JP3 (Adr0 pin).

• See Table 1-1 for the I2C Device Address bits and JP2 and JP3 connections.

Note: The user can use this board without the PICkit Serial Analyzer as long as

the VDD, SCL, and SDA are provided through J1 connector. This Evaluation

Board does not include MCU.

MCP3423 Evaluation Board User’s Guide

FIGURE 1-1: Front View of the MCP3423 Evaluation Board.

1.3 GETTING STARTED WITH PICKIT SERIAL ANALYZER

Figure 1-1 shows the MCP3423 Evaluation Board, and Figure 1-2 shows the

MCP3423 and PICkit Serial Analyzer.

The following describes how to use them together:

1. Connect the MCP3423 Evaluation Board’s 6-pin socket to the PICkit Serial

Analyzer as shown in Figure 1-2.

2. Connect the oscilloscope probes to the SCL and SDA test pins (optional).

3. VDD Selection: You can use the VDD from the PICkit Serial Analyzer or use your

own external VDD. The JP1 connector selects the VDD path.

(a) Connect JP1, if using VDD from PICkit Serial Analyzer.

(b) Disconnect JP1 and apply VDD at VDD1 pin, if you are using an external VDD.

4. Address bit selection using JP2 and JP3 connectors.

The I2C device code and address bits of the MCP3423 device are:

• MCP3423 I2C device code: ‘1101’

• A2, A1, A0 Address Bits: determined by the JP2 (Adr1 pin) and JP3 (Adr0 pin)

• The JP2 and JP3 connectors are external address bit selections. Connect these

pins to VSS, VDD, float, or connect any arbitrary voltage

• See Table 1-1 for the I2C Device Address bits and JP2 and JP3 connections

5. Connecting VDD:LED D1 turns on when VDD is applied. The PICkit Serial

Analyzer will provide VDD automatically, if it is connected to the PC. Make sure

LED D1 turns on, when you execute the command using the PICkit Serial

Analyzer.

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