Microchip Technology MCP3423 User Manual

MCP3423

Evaluation Board

User’s Guide

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

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MCUs and dsPIC® DSCs, KEELOQ

code hopping

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

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 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.

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

Underlined, italic text with right angle bracket

Bold characters A dialog button Click OK

N‘Rnnnn A number in verilog format,

Text in angle brackets < > 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 repeated text var_name [,

A menu path File>Save

A tab Click the Power tab

where N is the total number of digits, R is the radix 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 mutually exclusive 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)

{ ... }

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

C Interface and On-Board Reference” (DS22088)

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 (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.

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

the V Board does not include MCU.

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 I

Appendix A. “Schematic and Layouts”.

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

2C™

bus line and observe the resulting conversion output. Refer to

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 I

C Device Address bits and JP2 and JP3 connections.

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. V

4. Address bit selection using JP2 and JP3 connectors.

The I

• MCP3423 I

• 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

• See Table 1-1 for the I

5. Connecting V

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

own external V

(a) Connect JP1, if using V

(b) Disconnect JP1 and apply V

C device code and address bits of the MCP3423 device are:

C device code: ‘1101’

pins to V

, VDD, float, or connect any arbitrary voltage

Analyzer will provide V

. The JP1 connector selects the VDD path.

from PICkit Serial Analyzer.

at VDD1 pin, if you are using an external VDD.

C Device Address bits and JP2 and JP3 connections

: LED D1 turns on when V

automatically, if it is connected to the PC. Make sure

is applied. The PICkit Serial

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

Quick Start Instructions

6. Connecting the analog inputs: If you need to measure a single-ended input,

connect the unused pin (example, CHx-) to V

• Connecting the inputs: The MCP3423 Evaluation Board has input pads for two

analog input channels. You can connect all inputs at the same time and multiplex the input channel using configuration register settings. You can also leave the unused channel inputs floating.

7. Use the PICkit Serial Analyzer PC GUI to send I

CAUTION

Each analog input pin has an ESD diode. Certain input conditions can damage the device. Please use the following conditions:

(a) Do not apply an input greater than the input range specified by the MCP3423 Data

Sheet.

(b)Apply the input signal after V

TABLE 1-1: I

C ADDRESS BITS VS. JP2 AND JP3 CONNECTORS

is powered-up.

C write and read commands.

I2C Device Address

Bits

110 1 000 W

/R Connected to V

110 1 001 W/R Connected to V 110 1 010 W

/R Connected to V 110 1 100 W/R Connected to V 110 1 101 W/R Connected to V 110 1 110 W

/R Connected to V 110 1 011 W/R Float Connected to V 110 1 111 W/R Float Connected to V

JP2 (Adr1 Pin) JP3 (Adr0 Pin)

Connected to V

Float

Connected to V

Float

Connected to V

110 1 000 W/R Float Float Note 1: W

/R bit = “0” for writing, “1” for reading.

2: Float: (a) Leave pin without connecting to anything, or (b) apply Addr_Float voltage.

See MCP3423 Data Sheet for more details.

+ 23 hidden pages

Microchip Technology MCP3423 User Manual

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

Chapter 1. Quick Start Instructions

1.1 INTRODUCTION

1.2 DESCRIPTION OF THE MCP3423 EVALUATION BOARD

1.3 GETTING STARTED WITH PICKIT SERIAL ANALYZER