Microchip Technology PT100 RTD Manual de usuario

PT100 RTD

Evaluation Board

User’s Guide

Information contained in this publication regarding device

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and may be superseded by updates. It is your responsibility to

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PT100 RTD EVALUATION

BOARD USER’S GUIDE

Table of Contents

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

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

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

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

Recommended Reading........................................................................................ 2

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

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

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

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

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

1.2 What is the PT100 RTD Evaluation Board? ................................................... 5

1.3 What the PT100 RTD Evaluation Board Kit Includes ..................................... 5

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

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

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

2.3 Getting Started ............................................................................................... 8

2.4 Functional Description .................................................................................. 10

Appendix A. Schematic and Layouts ........................................................................ 13

A.1 Introduction .................................................................................................. 13

A.2 Board Schematic - Page 1 ........................................................................ 14

A.3 Board Schematic - Page 2 ........................................................................ 15

A.4 Board - Top Silk-Screen Layer ................................................................... 16

A.5 Board - Top Layer ...................................................................................... 16

A.6 Board - Bottom Silk .................................................................................. 17

A.7 Board - Bottom Layer ................................................................................. 17

Appendix B. Bill Of Materials (BOM) ......................................................................... 19

Worldwide Sales and Service .................................................................................... 22

PT100 RTD Evaluation Board User’s Guide

NOTES:

PT100 RTD EVALUATION

BOARD USER’S GUIDE

Preface

INTRODUCTION

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

PT100 RTD 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 PT100 RTD Evaluation Board as a develop-

ment tool. The manual layout is as follows:

•Chapter 1. “Product Overview” – Important information about the PT100 RTD

Evaluation Board.

•Chapter 2. “Installation and Operation” – This chapter includes a detailed

description of each function of the demo board and instructions for how to begin

using the board.

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

diagrams for the PT100 RTD Evaluation Board.

•Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the PT100

RTD 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.

PT100 RTD 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 the PT100 RTD Evaluation Board. The

following Microchip documents are available on our web site (www.microchip.com) and

recommended as supplemental reference resources.

MCP6S26 Data Sheet, “Single-Ended, Rail-toRail I/O, Low Gain PGA“ (DS21117)

This data sheet provides detailed information regarding the MCP6S26 device.

MCP3301 Data Sheet, “13-Bit Differential Input, Low Power A/D Converter w/SPI

Serial Interface” (DS21700)

This data sheet provides detailed information regarding the MCP3301 device.

MCP602X Data Sheet, “Rail-to-Rail Input/Output, 10 MHz Op Amps“ (DS21685)

This data sheet provides detailed information regarding the MCP602X devices.

MCP41010 Data Sheet, “Single/Dual Digital Potentiometer with SPI Interface“

(DS11195)

This data sheet provides detailed information regarding the MCP41XXX devices.

PIC18F2455/2550/4455/4550 Data Sheet, “28/40/44-Pin, High-Performance,

Enhanced Flash, USB Microcontrollers with nanoWatt Technology“ (DS39632)

This data sheet provides detailed information regarding the

PIC18F2455/2550/4455/4550 devices.

TC1070/TC1071/TC1187 Data Sheet, “50mA,100mA,and150mAAdjustable

CMOS LDOs w/Shutdown“ (DS21353)

This data sheet provides detailed information regarding the TC1070/TC1071/TC1187

devices.

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

PT100 RTD Evaluation Board User’s Guide

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

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 (May 2006)

• Initial Release of this Document.

PT100 RTD EVALUATION

BOARD USER’S GUIDE

Chapter 1. Product Overview

1.1 INTRODUCTION

This chapter provides an overview of the PT100 RTD Evaluation Board and covers the

following topics:

• What is the PT100 RTD Evaluation Board?

• What the PT100 RTD Evaluation Board kit includes.

1.2 WHAT IS THE PT100 RTD EVALUATION BOARD?

The PT100 RTD Evaluation Board demonstrates how to bias a Resistive Temperature

Detector (RTD) and accurately measure temperature. Up to two RTDs can be

connected. The RTDs are biased using constant current source and the output voltage

is scaled using a difference amplifier. In addition to the difference amplifier, a multiple

input channel Programmable Gain Amplifier (PGA) MCP6S26 is used to digitally switch

between RTDs and increase the scale up to 32 times.

The output of the difference amplifier is connected to a 12-bit differential

Analog-to-Digital Converter (ADC) MCP3301. The ADC outputs serial data to the

PIC18F2550 using a Serial Peripheral Interface (SPI). The data is transmitted to a PC

using a USB interface.

A Microsoft®Excel®macro is used as a Graphical User Interface (GUI) to acquire the

data. The acquired data is stored in an Excel Worksheet and graphed as a real-time

stripchart display. In addition, the user can select input channels, acquisition interval

and stripchart display buffer size.

1.3 WHAT THE PT100 RTD EVALUATION BOARD KIT INCLUDES

This PT100 RTD Evaluation Board Kit includes:

• The PT100 RTD Evaluation Board (102-00096)

• PIC18F2550 Firmware (USB)

• Microsoft Excel-Based GUI

• PT100 RTD Evaluation Board User’s Guide (DS-51607)

• Mini-USB Cable

PT100 RTD Evaluation Board User’s Guide

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