MCP6031
Photodiode PICtail™ Plus
Demo Board
User’s Guide
© 2008 Microchip Technology Inc.
DS51763A
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
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Information contained in this publication regarding device
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Trademarks
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PICSTART, rfPIC, SmartShunt and UNI/O are registered
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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, PIC32 logo, PowerCal, PowerInfo,
PowerMate, PowerTool, REAL ICE, rfLAB, Select Mode, Total
Endurance, WiperLock and ZENA are trademarks of
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SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
All other trademarks mentioned herein are property of their
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© 2008, Microchip Technology Incorporated, Printed in the
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Printed on recycled paper.
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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.
DS51763A-page ii
© 2008 Microchip Technology Inc.
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
© 2008 Microchip Technology Inc.
DS51763A-page iii
MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide
NOTES:
DS51763A-page iv
© 2008 Microchip Technology Inc.
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® IDE on-line help.
Select the Help menu, and then Topics to open a list of available on-line help files.
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 Photodiode PICtail™ 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 operation
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 .
© 2008 Microchip Technology Inc.
DS51763A-page 1
MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description
Arial font:
Italic characters
Represents
Referenced books
Emphasized text
A window
A dialog
A menu selection
A field name in a window or
dialog
A menu path
MPLAB® IDE User’s Guide
...is the only compiler...
the Output window
the Settings dialog
select Enable Programmer
“Save project before build”
A dialog button
A tab
A number in verilog format,
where N is the total number of
digits, R is the radix and n is a
digit.
A key on the keyboard
Click OK
Click the Power tab
4‘b0010, 2‘hF1
Italic Courier New
Sample source code
Filenames
File paths
Keywords
Command-line options
Bit values
Constants
A variable argument
Square brackets [ ]
Optional arguments
Curly brackets and pipe
character: { | }
Ellipses...
Choice of mutually exclusive
arguments; an OR selection
Replaces repeated text
#define START
autoexec.bat
c:\mcc18\h
_asm, _endasm, static
-Opa+, -Opa0, 1
0xFF, ‘A’
file.o, where file can be
any valid filename
mcc18 [options] file
[options]
errorlevel {0|1}
Initial caps
Quotes
Underlined, italic text with
right angle bracket
Bold characters
N‘Rnnnn
Text in angle brackets < >
Courier New font:
Plain Courier New
Represents code supplied by
user
DS51763A-page 2
Examples
File>Save
Press <Enter>, <F1>
var_name [,
var_name...]
void main (void)
{ ...
}
© 2008 Microchip Technology Inc.
Preface
RECOMMENDED READING
This user's guide describes how to use MCP6031 Photodiode PICtail™ Plus Demo
Board . Other useful documents are listed below. The following Microchip documents
are available and recommended as supplemental reference resources.
• MCP6031/2/3/4 Data Sheet, “0.9 μA, High Precision Op Amps” (DS22041) This data sheet provides detailed information regarding the MCP603X Op Amps.
• AN951, “Amplifying High-Impedance Sensors - Photodiode Example”
(DS00951) - This application note shows how to condition the current out of a
high-impedance sensor. A photodiode detector illustrates the theory.
• “Signal Chain Design Guide” (DS21825)
• “Explorer 16 Development Board User’s Guide” (DS51589)
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 (September 2008)
• Initial Release of this Document.
© 2008 Microchip Technology Inc.
DS51763A-page 3
MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide
NOTES:
DS51763A-page 4
© 2008 Microchip Technology Inc.
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: MCP6031 Photodiode PICtail™ Plus Demo Board
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 (102-00219)
• 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:
© 2008 Microchip Technology Inc.
MCP6031 Photodiode PICtail™ Plus Demo Board Kit.
DS51763A-page 5
MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide
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 (IS) to voltage. The circuit was not calibrated
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.
The measured voltage (VOUT) and calculated illuminance (L) will be shown on LCD
screen on board. The illuminance (L) will be calculated by the equation:
EQUATION 1-1:
L = illuminance (lx)
= ( V OUT ⁄ R 1 ) ( 10000 l X /70 μ A )
Figure 1-2 shows the block diagram of the MCP6031 Photodiode PICtail™ Plus Demo
Board .
Explorer 16 Development Board
LCD Screen
Vout = ___________ V
L = ____________ lx
PIC24FJ128 Microcontroller
10 Bit ADC Module
VOUT
MCP603x Photodiode
PICtail™ Plus Demo Board
RC Low-Pass
Filter
VDD = VREF
= 3.3V
FIGURE 1-2:
Block Diagram.
DS51763A-page 6
MCP6031
Transimpedance
Amplifier
VREF = 3.3V
IS
+
-
PN334 Photodiode
MCP6031 Photodiode PICtail™ Plus Demo Board Function
© 2008 Microchip Technology Inc.
Product Overview
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. C1 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 photo-current will be VOUT = ISR1, where R1
is the feedback resistor. The op amp will contribute a DC offset voltage, VOS + IBR1, to
the output, where VOS is the op amp’s input offset voltage and IB is the op amp’s input
bias current. Select the value of R1 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 IS is at its extreme
values. The op amp needs to have VOS and IB low enough to not cause a large DC
offset. That is the reason why op amp MCP6031 is selected.
.
C1
unpopulated
R2 10 kΩ
R1 42.2 kΩ
VOUT
+3.3V
D1
PNZ334
U1
MCP6031
C2
C3
33 nF
Low-Pass Filter
0.1 µF
Transimpedance Amplifier
FIGURE 1-4:
Diagram.
© 2008 Microchip Technology Inc.
MCP6031 Photodiode PICtail™ Plus Demo Board Circuit
DS51763A-page 7
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. The last sections of this application note
contain supplemental information.
MCP6031 Photodiode PICtail™ Plus Demo Board has the following features:
•
•
•
•
DS51763A-page 8
Supports Microchip MCP6031 high precision op amp
Uses a transimpedance amplifier as sensor conditioning circuit
Uses a PIN photodiode (PNZ334) as light detector
Test points for connecting lab equipment
© 2008 Microchip Technology Inc.
MCP6031 PHOTODIODE PICtail™
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.
Explorer 16
Development
Board.
MCP6031
Photodiode
PICtail™ Plus
Demo Board
J5
FIGURE 2-1:
MCP6031 Photodiode PICtail™ Plus Demo Board Set-Up.
© 2008 Microchip Technology Inc.
DS51763A-page 9
MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide
2.4
MCP6031 PHOTODIODE PICtail™ PLUS DEMO BOARD OPERATION
Figure 2-2 shows data taken near an incandescent lamp powered by a battery.
Incandescent lamp
LED
FIGURE 2-2:
DS51763A-page 10
MCP6031 Photodiode PICtail™ Plus Demo Board Operation.
© 2008 Microchip Technology Inc.
MCP6031 PHOTODIODE PICtail™
PLUS DEMO BOARD USER’S GUIDE
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
© 2008 Microchip Technology Inc.
DS51763A-page 11
MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide
BOARD - SCHEMATIC
M
A.2
DS51763A-page 12
© 2008 Microchip Technology Inc.
Schematic and Layouts
A.3
BOARD - TOP SILK LAYER
A.4
BOARD - TOP METAL AND TOP SILK LAYERS
© 2008 Microchip Technology Inc.
DS51763A-page 13
MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide
A.5
BOARD - BOTTOM METAL LAYER
DS51763A-page 14
© 2008 Microchip Technology Inc.
MCP6031 PHOTODIODE PICtail™
PLUS DEMO BOARD USER’S GUIDE
Appendix B. Bill of Materials (BOM)
TABLE B-1:
Qty
BILL OF MATERIALS (102-00219)
Reference
Description
Manufacturer
Part Number
®
ECJ-2VB1H333K
1
C2
CAP 33,000PF 50V CERM X7R
0805
Panasonic
2
C3, C4
CAP .1UF 25V CERAMIC X7R
0805
Panasonic®
ECJ-2VB1E104K
1
C5
CAP 1.0UF 16V CERAMIC X7R
0805
Kemet® Electronics Corp.
C0805C105K4RACTU
1
D1
PIN PHOTODIODE
Panasonic®
PNZ334
1
R1
RES 42.2K OHM 1/10W 1% 0805
SMD
Panasonic®
ERJ-6ENF4222V
1
R2
RES 10.0K OHM 1/10W 1% 0805
SMD
Panasonic®
ERJ-6ENF1002V
3
TP1—TP3
TEST POINT PC COMPACT SMT Keystone Electronics
5016
1
U1
MCP6031, SOT-23-5
MCP6031T-E/OT
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.
TABLE B-2:
Qty
1
Note:
Microchip Technology Inc.
BILL OF MATERIALS - UNPOPULATED PARTS
Reference
C1
Description
Not Populated when shipped to
customer
Manufacturer
—
Part Number
—
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.
© 2008 Microchip Technology Inc.
DS51763A-page 15
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01/02/08
DS51763A-page 16
© 2008 Microchip Technology Inc.