Microchip MCP9700 User Manual

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MCP9700 Temperature-to-Voltage

Converter PICtail™ Demo Board

User’s Guide

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8-bit MCUs, KEELOQ

code hopping

MCP9700 TEMPERATURE-TO-VOLTAGE

CONVERTER PICtail™ DEMO BOARD

USER’S GUIDE

Table of Contents

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

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

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

1.2 What is the MCP9700 Temperature-to-Voltage Converter PICtail™ Demo

Board? ...................................................................................................... 5

1.3 What the MCP9700 Temperature-to-Voltage Converter PICtail™ Demo

Board Kit Includes ....................................................................................5

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

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

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

2.3 Getting St a rt ed ................................. ............... ................ ............... ................ 7

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

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

A.2 Board Sche m a t ic .......... .. ................ ............... ................ ............................ . 1 4

A.3 Board – Top La y er ... ............... ............................. ............... ....................... 14

A.4 Board – Silk-screen Layer ..........................................................................15

A.5 Board – Bottom Layer ....... ............................ ............................. ............... . 1 5

Appendix B. Bill-Of-Materials (BOM) ......................................................................... 17

Worldwide Sales and Service ....................................................................................18

MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board User’s Guide

NOTES:

MCP9700 TEMPERATURE-TO-VOLTAGE

CONVERTER PICtail™ DEMO 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 MCP9700 Temperature-to-Volt age Converter PICtail™ Demo 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 MCP9700 T emperature-to-Voltage Converter PICtail™ Demo Board User’s Guide. The manual layout is as follows:

• Chapter 1. “Product Overview” – Important information about the MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board.

• Chapter 2. “Installation and Operation” – This chapter includes instructions on how to get started, with a detailed description of each of the board’s functions.

• Appendix A. “Schematic and Layouts” – Shows the schematic and layout diagrams for the MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board.

• Appendix B. “Bill-Of-Materials (BOM)” – Lists the parts used to build the MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board.

MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board 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 characters Referenced books MPLAB

Emphasized text ...is the only comp ile r...

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

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

Courier font:

Plain Courier Sample source code #define START

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

Square brackets [ ] Optional arguments mpasmwin [options]

Curly brackets and pipe character: { | }

Ellipses... Replaces r epeated text var_name [,

A menu path File>Save

A tab Click the Power tab

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 exclus ive arguments; an OR selection

Represents code supplied by user

“Save project before build”

any valid filename

file [options]

errorlevel {0|1}

var_name...]

void main (void) { ... }

IDE User’s Guide

Chapter 1. Product Overview

1.1 INTRODUCTION

This chapter provides an overview of the MCP9700 T emperature-to-Voltage Converter PICtail™ Demo Board and covers the following topics:

• What is the MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board?

• What the MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board Kit includes

1.2 WHAT IS THE MCP9700 TEMPERA TURE-TO-VOLTAGE CONVERTER PICTAIL™ DEMO BOARD?

The MCP9700 T emperature-to-Voltage Converter PICtail™ Demo Board demonstrates how to interface the MCP9700 to a PICmicro Flash Starter Kit as a platform. A PIC16F676 14-pin, Flash-based, 8-bit CMOS microcontoller device is included with the demo board that can be used with the PICkit™ 1 Flash Starter Kit, along with firmware that provides the interface to the MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board and the voltage-to-temperature conversion routines.

The MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board can also be used as a “stand-alone” module to quickly add thermal sensing capablity to any existing application. This basic sensor functionality is implemented on a small Printed Circuit Board (PCB) and an interface via a standard 100 mil header.

microcontroller using the PICkit™ 1

1.3 WHAT THE MCP9700 TEMPERATURE-TO-VOLTAGE CONVERTER PICTAIL™ DEMO BOARD KIT INCLUDES

This MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board Kit includes:

• The MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board

• MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board User’s Guide, DS51542

• AN981, “Interfacing a MCP9700 Analog Output Temperature Sensor to a PICmicro

• PIC16F676 14-pin, Flash-based, 8-bit CMOS Microcontroller

• PIC16F676 Firmware (00059R1.HEX)

Microcontroller”, DS00981

MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board User’s Guide

NOTES:

Chapter 2. Installation and Operation

2.1 INTRODUCTION

The MCP9700 T emperature-to-Voltage Converter PICtail™ Demo Board demonstrates how to interface the MCP9700 to a microcontroller, for use by the system designer as an example of how to integrate an analog temperature sensor into their system.

2.2 FEATURES

The MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board has the following features:

•Small PCB layout

• Standard 100 mil 14-pin header (P1) for easy interface to PICkit™ 1 Flash Starter Kit or custom application

2.3 GETTING STARTED

MCP9700 TEMPERATURE-TO-VOLTAGE

CONVERTER PICtail™ DEMO BOARD

USER’S GUIDE

This section describes how to quickly set up the MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board and PICkit 1 Flash Starter Kit. A block diagram of the setup is presented in Figure 2-1. Refer to AN981, “Interfacing a MCP9700 Analog Output Temperature Sensor to a PICmicro information on the MCP9700 T emperature-to-Voltage Converter PICtail™ Demo Board and the 00059R1.HEX firmware.

PICkit™ 1 Flash Starter Kit

PICmicro

Flash

MCU

USB

LED Array

ADC

GND

Microcontroller” (DS00981), for detailed

MCP9700

Temperature

Sensor

OUT

+5V

MCP9700 PICtail™

Daughter Board

D4D5D6D7 D0D1D2D3

FIGURE 2-1: MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board Block Diagram.

MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board User’s Guide

2.3.1 Hardware Setup

1. Connect the P1 header of the MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board to the J3 connector on the PICkit 1 Flash Starter Kit board. Refer to Figure 2-2 for proper orientation of the MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board and Figure 2-3 for the simplified board schematic.

2. Insert the PIC16F676 into the Evaluation socket of the PICkit 1 Flash Starter Kit board.

3. Connect the PICkit 1 Flash Starter Kit USB cable from the USB port of the PC to the USB port (J1) on t he PIC kit 1 Fl ash Starter K it boa rd. +5V p ower is suppli ed to the PICkit 1 Flash Starter Kit board via the USB cable. The green POWER LED and the red BUSY LED will turn on, indicating that power is being supplied to the board.

Expansion Header (J3)

USB Cable

LED D7

MCP9700 PICtail™ Daughter Board

LED D0

Insert PIC16F676

PICkit™ 1 Flash Starter Kit

FIGURE 2-2: MCP9700 PICtail™ Daughter Board and PICkit™ 1 Flash Starter Kit.

PICkit™ 1

Flash Starter Kit

+5V

To ADC

RC0

J3 13

MCP9700 PICtail™ Daughter Board

(SC70-5)

OUT

0.1 µF

GND

FIGURE 2-3: Simplified MCP9700 PICtail™ Daughter Board Schematic.

Installation and Operation

2.3.2 Programming the PIC16F676

1. Download and install the PICkit 1 Flash Starter Kit software to your PC.

2. Copy the 00059R1.HEX file, supplied on the CD that came with this kit, to your

PC.

3. Once the PICkit 1 Flash Starter Kit is started, the main window will be displayed

on the PC, as indicated in Figure 2-4.

FIGURE 2-4: PICkit™ 1 Flash Starter Kit GUI Window on the PC.

4. Toggle device power to off by unchecking the Device Power box under Board

Controls in the PICkit 1 Flash Starter Kit window (Figure 2-4). The BUSY LED

on the PICkit 1 Flash Starter Kit board will turn off once the device power is turned off.

5. Click on the Erase button in the window to ensure that the PIC16F676 device has

been erased.

6. From the File pull down menu, select Import HEX. A file window will appear.

Select and open “00059R1.HEX”.

7. Click on the Write Device button in the PICkit 1 Flash Starter Kit window. The

PIC16F676 device will be written to with the 00059R1.HEX firmware. When completed, the status bar at the bottom of the window will indicate Write Successful.

8. Toggle the device power on by checking the Device Power box under Board

Controls in the PICkit 1 Flash Starter Kit window . The BUSY LED on the PICkit 1 Flash Starter Kit board will turn on once the device power is turned on. Some of the red LEDs (D7-D0) will turn on as well.

MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board User’s Guide

At this point, the PIC16F676 is reading the temperature data from the MCP9700 and displaying the temperature on the eight red LEDs (D7-D0) on the PICkit 1 Flash Starter Kit board. The ten’s digit of the temperature data is represented by bits D7-D4, with D7 being defined as the Most Significant bit (MSb). The one’s digit is defined by bits D3-D0, with D3 serving as the MSb.

The temperature can be displayed in degrees Celsius or Fahrenheit. The board defaults to the temperature being displayed in Celsius. To display the temperature in Fahrenheit, press the SW1 push button switch on the PICkit 1 Flash Starter Kit board. The display will change back to Celsius once the SW1 push button switch is released.

Table 2-1 provides a list of the LED patterns that correspond to the BCD coding representation of the temperature measurement.

TABLE 2-1: BCD CODE REPRESENTATION ON PICkit™ 1 FLASH STARTER

KIT LEDS

Binary

0000 0 OFF OFF OFF OFF 0001 1 OFF OFF OFF ON 0010 2 OFF OFF ON OFF 0011 3OFFOFFONON 0100 4 OFF ON OFF OFF 0101 5 OFF ON OFF ON 0110 6 OFF ON ON OFF 0111 7 OFF ON ON ON 1000 8ONOFFOFFOFF 1001 9ONOFFOFFON

BCD

Number

For example, a temperature reading of 75

D7 D3

D6 D2

F will be displayed by turning on LEDs D6,

D5 D1

D4 D0

D5, D4, D2 and D0 (LEDs D7, D3 and D1 will be turned off), as indicated in Figure 2-5.

Installation and Operation

MCP9700 Temp Sensor

Demo Board

Temperature

Displayed in

BCD

D7 D6 D5 D4

D3 D2 D1 D0

BUSY

PICkit™ Flash

Starter Kit Board

POWER

FIGURE 2-5: PICkit™ 1 Flash Starter Kit LED Display of 75°F.

The temperature display will change when the temperature of the MCP9700 is varied. A simple example of this can be seen by pressing your finger on the MCP9700 device (U1) mounted on the MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board. More dramatic changes can be seen by applying heat to the MCP9700 with a hair dryer, hot air gun or by cooling the device down.

Refer to the MCP9700 data sheet, “Low-Power Voltage Output Temperature Sensor” (DS21942), for more information on the MCP9700 and AN981, “Interfacing a MCP9700 Analog Output Temperature Sensor to a PICmicro information on the MCP9700 T emperature-to-Voltage Converter PICtail™ Demo Board and 00059R1.HEX firmware.

Microcontroller”, for more

MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board User’s Guide

NOTES:

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

This appendix contains the following schematics and layouts for the MCP9700 Temperature-to-Voltage Converter PICtail Demo Board:

• Board Sc hematic

• Board – Top Layer

• Board – Silk-screen Layer

• Board – Bottom Layer

MCP9700 TEMPERATURE-TO-VOLTAGE

CONVERTER PICtail™ DEMO BOARD

USER’S GUIDE

MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board User’s Guide

A.2 BOARD SCHEMATIC

P1 P2 P3

HDR1X14

VOUT

GND

VOUT

VDD

MCP9700_SC70

RA5

RA4

RA3

RC5

RC4

RC3

RA0

RA1

RA2

RC0

RC1

RC2

+5V

GND

TP3

HDR1X14

+5V

0.1 μF C1

TP1

VOUT

+5V

TP2

PICkit™ 1 Flash Starter Kit Expansion Header J3

HDR1X14

A.3 BOARD – TOP LAYER

A.4 BOARD – SILK-SCREEN LAYER

Schematic and Layouts

A.5 BOARD – BOTTOM LAYER

MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board User’s Guide

NOTES:

MCP9700 TEMPERATURE-TO-VOLTAGE

CONVERTER PICtail™ DEMO BOARD

Appendix B. Bill-Of-Materials (BOM)

TABLE B-1: BILL-OF-MATERIALS (BOM)

Reference

Designator

C1 1 Cap., 0.1 µF, 25V, Ceramic, X7R 0805 Panasonic P1 1 Conn Hdr Brkway .100 40pos RT/A AMP/

U1 1 MCP9700 Tiny Analog Temperature Sensor Microchip

Quantity Description Manufacturer

USER’S GUIDE

-ECG ECJ-2VB1E104K

Tyco™

Electronics

Technology Inc.

Manufacturer

Part Number

4-103765-0

MCP9700T-E/LT

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03/01/05

Microchip MCP9700 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

Chapter 1. Product Overview

1.1 INTRODUCTION

1.2 WHAT IS THE MCP9700 TEMPERA TURE-TO-VOLTAGE CONVERTER PICTAIL™ DEMO BOARD?

1.3 WHAT THE MCP9700 TEMPERATURE-TO-VOLTAGE CONVERTER PICTAIL™ DEMO BOARD KIT INCLUDES

Chapter 2. Installation and Operation

2.1 INTRODUCTION

2.2 FEATURES

2.3 GETTING STARTED

FIGURE 2-1: MCP9700 Temperature-to-Voltage Converter PICtail™ Demo Board Block Diagram.

FIGURE 2-2: MCP9700 PICtail™ Daughter Board and PICkit™ 1 Flash Starter Kit.

FIGURE 2-3: Simplified MCP9700 PICtail™ Daughter Board Schematic.

FIGURE 2-4: PICkit™ 1 Flash Starter Kit GUI Window on the PC.

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

Appendix B. Bill-Of-Materials (BOM)

TABLE B-1: BILL-OF-MATERIALS (BOM)