Microchip Technology MCP6031 Photodiode PICtail Plus Demo Board User guide

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MCP6031

Photodiode PICtail™ Plus

Demo Board

User’s Guide

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.

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in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates.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.

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

EELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,

PICSTART, rfPIC, SmartShunt and UNI/O are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

FilterLab, Linear Active Thermistor, MXDEV, MXLAB, SEEVAL, SmartSensor 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, CodeGuard, dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN, ECONOMONITOR, FanSense, In-Circuit Serial Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB Certified logo, MPLIB, MPLINK, mTouch, PICkit, PICDEM, PICDEM.net, PICtail, PIC

logo, PowerCal, PowerInfo, PowerMate, PowerT ool, REAL ICE, rfLAB, Select Mode, Total Endurance, 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.

Microchip received ISO/TS-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and T empe, Arizona; Gresham, Oregon and design centers in California and India. The Company’s quality system processes and procedures are for its PIC devices, Serial EEPROMs, microperipherals, nonvolatile memo ry and analog products. In addition, Microchip’s quality system for the desig n and manufacture of development systems is ISO 9001:2000 certified.

MCUs and dsPIC® DSCs, KEELOQ

code hopping

MCP6031 PHOTODIODE PICtail™

PLUS DEMO 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. Product Overview

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

1.2 MCP6031 Photodiode PICtail™ Plus Demo Board Kit Contents ................... 5

1.3 MCP6031 Photodiode PICtail™ Plus Demo Board Description .................... 6

Chapter 2. Installation and Operation

2.1 Introduction .....................................................................................................9

2.2 Required Tool .................................................................................................9

2.3 MCP6031 Photodiode PICtail™ Plus Demo Board Set-up ........................... 9

2.4 MCP6031 Photodiode PICtail™ Plus Demo Board Operation ....................10

Appendix A. Schematic and Layouts

A.1 Introduction ..................................................................................................11

A.2 Board - Schematic .......................................................................................12

A.3 Board - Top Silk Layer ................................................................................ 13

A.4 Board - Top Metal And Top Silk Layers ....................................................... 13

A.5 Board - Bottom Metal Layer .........................................................................14

Appendix B. Bill of Materials (BOM)

Worldwide Sales and Service ....................................................................................16

MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide

NOTES:

MCP6031 PHOTODIODE PICtail™

PLUS 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 MCP6031 Photodiode PICtail™ Plus 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 MCP6031 Pho to diod e P ICtail™ Plus Demo Board as a development tool to emulate and debug firmware on a target board. The manual layout is as follows:

• Chapter 1. “Product Overview” – Provides the important information about the MCP6031 Photodiode PICtail™ Plus Demo Board .

• Chapter 2. “Installation and Operation” – Covers the installation and operatio n of the MCP6031 Photodiode PICtail™ Plus Demo Board .

• Appendix A. “Schematic and Layouts” – Shows the schematic and board layouts for the MCP6031 Photodiode PICtail™ Plus Demo Board .

• Appendix B. “Bill of Materials (BOM)” – Lists the parts used to build the MCP6031 Photodiode PICtail™ Plus Demo Board .

MCP6031 Photodiode PICtail™ Plus Demo 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

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. Lo cal 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 (September 2008)

• Initial Release of this Document.

MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide

NOTES:

MCP6031 PHOTODIODE PICtail™

PLUS DEMO BOARD USER’S GUIDE

Chapter 1. Product Overview

1.1 INTRODUCTION

The MCP6031 Photodiode PICtail™ Plus Demo Board is described by the following:

• Assembly # : 114-00219

• Order # : MCP6031DM-PCTL

• Name: MCP6 03 1 Pho to d iod e PICtail™ Plus Demo Boar d

Items discussed in this chapter include:

• MCP6031 Photodiode PICtail™ Plus Demo Board Kit Contents

• MCP6031 Photodiode PICtail™ Plus Demo Board Description

1.2 MCP6031 PHOTODIODE PICtail™ PLUS DEMO BOARD KIT CONTENTS

• MCP6031 Photodiode PICtail™ Plus Demo Board (102-0021 9)

• Important Information “Read First”

• Analog and Interface Products Demonstration Boards CD-ROM (DS21912). It contains:

- MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide (DS51763)

- Firmware files

- Gerber files

FIGURE 1-1: MCP6031 Photodiode PICtail™ Plus Demo Board Kit.

MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide

OUTR1

⁄

()10000 lX /70 μA()

L = illuminance (l

)

MCP6031

Explorer 16 Development Board

PN334 Photodiode

RC Low-Pass Filter

10 Bit ADC Module V

REF

= 3.3V

LCD Screen

= V

REF

MCP603x Photodiode PICtail™ Plus Demo Board

Transimpedance Amplifier

PIC24FJ128 Microcontroller

Vout = ___________ V L = ____________ lx

OUT

= 3.3V

1.3 MCP6031 PHOTODIODE PICtail™ PLUS DEMO BOARD DESCRIPTION

The MCP6031 Photodiode PICtail™ Plus Demo Board demonstrates how to use a transimpedance amplifier, which consists of MCP6031 high precision op amp and external resistors, to convert photo-current (I for absolute accuracy.

The RC low-pass filter that is implemented in this circuit can remove the high frequency noise and interference from the signal path prior to the analog-to-digital (A/D) conversion.

The PICmicro

on the Explorer 16 Development Board communicates with the MCP6031 Photodiode PICtail™ Plus Demo Board and completes the analog-to-digital conversion.

Note: For high measurement accuracy, an external stand-alone ADC with higher

resolution needs to be used.

) to voltage. The circuit was not calibrated

The measured voltage (V

) and calculated illuminance (L) will be shown on LCD

OUT

screen on board. The illuminance (L) will be calculated by the equation:

EQUATION 1-1:

Figure 1-2 shows the block diagram of the MCP6031 Photodiode PICtail™ Plus Demo Board .

FIGURE 1-2: MCP6031 Photodiode PICtail™ Plus Demo Board Function Block Diagram.

Product Overview

33 nF

10 kΩ

Transimpedance Amplifier

Low-Pass Filter

unpopulated

R1 42.2 kΩ

+3.3V

OUT

PNZ334

MCP6031

0.1 µF

Figure 1-3 shows the top view of the MCP6031 Photodiode PICtail™ Plus Demo Board.

FIGURE 1-3: Top view of MCP6031 Photodiode PICtail™ Plus Demo Board

Figure 1-4 shows the circuit diagram of MCP6031 Photodiode PICtail™ Plus Demo Board. C

is for compensation purpose and no need for the board. It may be needed

when MCP6031 is replaced by the other Microchip’s op amp. The DC output voltage due to the source pho to-curre nt will be V

is the feedback resistor. The op amp will contribute a DC offset volt age, V the output, where V bias current. Select the value of R

is the op amp’s input of fset vo ltag e and IB is the op amp’s input

to give a high gain to IS. Usually , this gain is high

enough to use most of the op amp’s output voltage swing when I values. The op amp needs to have V

and IB low enough to not cause a large DC

= ISR1, where R1

OUT

is at its extreme

+ IBR1, to

offset. That is the reason why op amp MCP6031 is selected.

FIGURE 1-4: MCP6031 Photodiode PICtail™ Plus Demo Board Circuit Diagram.

MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide

For the design approach of this board, please refer to AN951, “Amplifying High-Impedance Sensors - Photodiode Example” (DS00951) as reference

resource. This application note discusses the analog conditioning circuit used for high-impedance sensors that act like current sensors. The design approach illustrated in this application note, using op amps, is broken down into three design steps: DC, stability compensation, closed-loop gain and noise reduction. A design using a PIN photodiode (light detector) illustrates the principles discussed. Measurement results are provided to support the theory presented. Th e last sections of this application note contain supplemental information.

MCP6031 Photodiode PICtail™ Plus Demo Board has the following features:

• Supports Microchip MCP6031 high precision op am p

• Uses a transimpedance amplifier as sensor conditioning circuit

• Uses a PIN photodiode (PNZ334) as light detector

• Test points for connecting lab equipment

MCP6031 PHOTODIODE PICtail™

MCP6031 Photodiode PICtail™ Plus Demo Board

Explorer 16 Development Board.

PLUS DEMO BOARD USER’S GUIDE

Chapter 2. Installation and Operation

2.1 INTRODUCTION

This chapter shows how to set up the MCP6031 Photodiode PICtail™ Plus Demo Board and explore the operation of a light sensing application.

Items discussed in this chapter include:

• Required Tools

• MCP6031 Photodiode PICtail™ Plus Demo Board Set-Up

• MCP6031 Photodiode PICtail™ Plus Demo Board Operation

2.2 REQUIRED TOOL

• Explorer 16 Development Board

2.3 MCP6031 PHOTODIODE PICtail™ PLUS DEMO BOARD SET-UP

Insert the MCP6031 Photodiode PICtail™ Plus Demo Board into the Explorer 16 Development Board as shown in Figure 2-1. An exploded view is shown in the Figure 2-2.

FIGURE 2-1: MCP6031 Photodiode PICtail™ Plus Demo Board Set-Up.

MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide

LED

Incandescent lamp

2.4 MCP6031 PHOTODIODE PICtail™ PLUS DEMO BOARD OPERATION

Figure 2-2 shows data taken near an incandescent lamp powered by a battery.

FIGURE 2-2: MCP6031 Photodiode PICtail™ Plus Demo Board Operation.

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

This appendix contains the following schematics and layouts for the MCP6031 Photodiode PICtail™ Plus Demo Board :

• Board – Schematic

• Board – Top Silk Layer

• Board - Top Metal And Top Silk Layers

• Board – Bottom Metal Layer

MCP6031 PHOTODIODE PICtail™

PLUS DEMO BOARD USER’S GUIDE

MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide

A.2 BOARD - SCHEMATIC

A.3 BOARD - TOP SILK LAYER

Schematic and Layouts

A.4 BOARD - TOP METAL AND TOP SILK LAYERS

MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide

A.5 BOARD - BOTTOM METAL LAYER

MCP6031 PHOTODIODE PICtail™

PLUS DEMO BOARD USER’S GUIDE

Appendix B. Bill of Materials (BOM)

TABLE B-1: BILL OF MATERIALS (102-00219)

Qty Reference Description Manufacturer Part Number

1 C2 CAP 33,000PF 50V CERM X7R

0805

2 C3, C4 CAP .1UF 25V CERAMIC X7R

0805

1 C5 CAP 1.0UF 16V CERAMIC X7R

0805 1 D1 PIN PHOTODIODE Panasonic 1 R1 RES 42.2K OHM 1/10W 1% 0805

SMD 1 R2 RES 10.0K OHM 1/10W 1% 0805

SMD 3 TP1—TP3 TEST POINT PC COMPACT SMT Keystone Electronics 5016 1 U1 MCP6031, SOT-23-5 Microchip Technology Inc. MCP6031T-E/OT

Panasonic

Kemet

Panasonic

Note: The components listed in this Bill of Materials are representative of the PCB assembly. The

released BOM used in manufacturing uses all RoHS-compliant components.

Electronics Corp. C0805C105K4RACTU

® ®

ECJ-2VB1H333K

ECJ-2VB1E104K

PNZ334 ERJ-6ENF4222V

ERJ-6ENF1002V

TABLE B-2: BILL OF MATERIALS - UNPOPULATED PARTS

Qty Reference Description Manufacturer Part Number

1 C1 Not Populated when shipped to

customer

——

Note: The components listed in this Bill of Materials are representative of the PCB assembly. The

released BOM used in manufacturing uses all RoHS-compliant components.

WORLDWIDE SALES AND SERVICE

AMERICAS

Corporate Office

2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: http://support.microchip.com Web Address: www.microchip.com

Atlanta

Duluth, GA Tel: 678-957-9614 Fax: 678-957-1455

Boston

Westborough, MA Tel: 774-760-0087 Fax: 774-760-0088

Chicago

Itasca, IL Tel: 630-285-0071 Fax: 630-285-0075

Dallas

Addison, TX Tel: 972-818-7423 Fax: 972-818-2924

Detroit

Farmington Hills, MI Tel: 248-538-2250 Fax: 248-538-2260

Kokomo

Kokomo, IN Tel: 765-864-8360 Fax: 765-864-8387

Los Angeles

Mission Viejo, CA Tel: 949-462-9523 Fax: 949-462-9608

Santa Clara

Santa Clara, CA Tel: 408-961-6444 Fax: 408-961-6445

Toronto

Mississauga, Ontario, Canada Tel: 905-673-0699 Fax: 905-673-6509

ASIA/PACIFIC

Asia Pacific Office

Suites 3707-14, 37th Floor Tower 6, The Gateway Harbour City, Kowloon Hong Kong Tel: 852-2401-1200 Fax: 852-2401-3431

Australia - Sydney

Tel: 61-2-9868-6733 Fax: 61-2-9868-6755

China - Beijing

Tel: 86-10-8528-2100 Fax: 86-10-8528-2104

China - Chengdu

Tel: 86-28-8665-5511 Fax: 86-28-8665-7889

China - Hong Kong SAR

Tel: 852-2401-1200 Fax: 852-2401-3431

China - Nanjing

Tel: 86-25-8473-2460 Fax: 86-25-8473-2470

China - Qingdao

Tel: 86-532-8502-7355 Fax: 86-532-8502-7205

China - Shanghai

Tel: 86-21-5407-5533 Fax: 86-21-5407-5066

China - Shenyang

Tel: 86-24-2334-2829 Fax: 86-24-2334-2393

China - Shenzhen

Tel: 86-755-8203-2660 Fax: 86-755-8203-1760

China - Wuhan

Tel: 86-27-5980-5300 Fax: 86-27-5980-5118

China - Xiamen

Tel: 86-592-2388138 Fax: 86-592-2388130

China - Xian

Tel: 86-29-8833-7252 Fax: 86-29-8833-7256

China - Zhuhai

Tel: 86-756-3210040 Fax: 86-756-3210049

ASIA/PACIFIC

India - Bangalore

Tel: 91-80-4182-8400 Fax: 91-80-4182-8422

India - New Delhi

Tel: 91-11-4160-8631 Fax: 91-11-4160-8632

India - Pune

Tel: 91-20-2566-1512 Fax: 91-20-2566-1513

Japan - Yokohama

Tel: 81-45-471- 6166 Fax: 81-45-471-6122

Korea - Daegu

Tel: 82-53-744-4301 Fax: 82-53-744-4302

Korea - Seoul

Tel: 82-2-554-7200 Fax: 82-2-558-5932 or 82-2-558-5934

Malaysia - Kuala Lumpur

Tel: 60-3-6201-9857 Fax: 60-3-6201-9859

Malaysia - Penang

Tel: 60-4-227-8870 Fax: 60-4-227-4068

Philippines - Manila

Tel: 63-2-634-9065 Fax: 63-2-634-9069

Singapore

Tel: 65-6334-8870 Fax: 65-6334-8850

Taiwan - Hsin Chu

Tel: 886-3-572-9526 Fax: 886-3-572-6459

Taiwan - Kaohsiung

Tel: 886-7-536-4818 Fax: 886-7-536-4803

Taiwan - Taipei

Tel: 886-2-2500-6610 Fax: 886-2-2508-0102

Thailand - Bangkok

Tel: 66-2-694-1351 Fax: 66-2-694-1350

EUROPE

Austria - Wels

Tel: 43-7242-2244-39 Fax: 43-7242-2244-393

Denmark - Copenhagen

Tel: 45-4450-2828 Fax: 45-4485-2829

France - Paris

Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79

Germany - Munich

Tel: 49-89-627-144-0 Fax: 49-89-627-144-44

Italy - Milan

Tel: 39-0331-742611 Fax: 39-0331-466781

Netherlands - Drunen

Tel: 31-416-690399 Fax: 31-416-690340

Spain - Madrid

Tel: 34-91-708-08-90 Fax: 34-91-708-08-91

UK - Wokingham

Tel: 44-118-921-5869 Fax: 44-118-921-5820

01/02/08

Microchip Technology MCP6031 Photodiode PICtail Plus Demo Board User guide

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. Product Overview

1.1 INTRODUCTION

1.2 MCP6031 PHOTODIODE PICtail™ PLUS DEMO BOARD KIT CONTENTS

1.3 MCP6031 PHOTODIODE PICtail™ PLUS DEMO BOARD DESCRIPTION

Chapter 2. Installation and Operation

2.1 INTRODUCTION

2.2 REQUIRED TOOL

2.3 MCP6031 PHOTODIODE PICtail™ PLUS DEMO BOARD SET-UP

2.4 MCP6031 PHOTODIODE PICtail™ PLUS DEMO BOARD OPERATION

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

A.2 BOARD - SCHEMATIC

A.3 BOARD - TOP SILK LAYER

A.4 BOARD - TOP METAL AND TOP SILK LAYERS

A.5 BOARD - BOTTOM METAL LAYER

Appendix B. Bill of Materials (BOM)

WORLDWIDE SALES AND SERVICE