MICROCHIP MCP6031 Photodiode PICtail Plus Demo Board User Guide
- June 8, 2024
- MICROCHIP
Table of Contents
- MCP6031 Photodiode PICtail Plus Demo Board
- Preface
- INTRODUCTION
- DOCUMENT LAYOUT
- Chapter 1. Product Overview
- Chapter 2. Installation and Operation
- Appendix A. Schematic and Layouts
- Appendix B. Bill of Materials (BOM)
- WORLDWIDE SALES AND SERVICE
- References
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)
MCP6031 Photodiode PICtail Plus Demo Board
User Guide
MCP6031
Photodiode PICtail™ Plus
Demo Board User’s Guide
Downloaded from Arrow.com.
© 2008 Microchip Technology Inc.
DS51763A
MCP6031 Photodiode PICtail Plus Demo Board
Note the following details of the code protection feature on Microchip devices:
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- 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
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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
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under that Act.
Information contained in this publication regarding device applications and
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32 logo, PowerCal, PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB, Select
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All other trademarks mentioned herein are property of their respective
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© 2008, Microchip Technology Incorporated, Printed in the
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** Printed on recycled paper.
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Company’s quality system processes and procedures are for its PIC® MCUs and
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nonvolatile memory and analog products. In addition, Microchip’s quality
system for the design and manufacture of development systems is ISO 9001:2000
certified.
MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide NOTES:**
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 .
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description | Represents | Examples |
---|
Arial font:
Italic characters| Referenced books| MPLAftw 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.| 41:10010, 2’hF1
Text in angle brackets < >| A key on the keyboard| Press
Courier New font:
Plain Courier New| Sample source code| !define START
Filenames| autoexec.bat
File paths| c: \mccle \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 (01 1)
Ellipses…| Replaces repeated text| var_name [,
var_name…]
Represents code supplied by user| void main (void)
{ …
}
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.
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
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: ![MICROCHIP MCP6031 Photodiode PICtail Plus Demo Board
- fig 2](https://manuals.plus/wp-content/uploads/2023/01/MICROCHIP-MCP6031 -Photodiode-PICtail-Plus-Demo-Board-fig-2.png)Figure 1-3 shows the top view of the 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.
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:
- 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
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. 2.4 MCP6031 PHOTODIODE
PICtail™ PLUS DEMO BOARD OPERATION
Figure 2-2 shows data taken near an incandescent lamp powered by a
battery.
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
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)
TABLE B-1: BILL OF MATERIALS (102-00219)
Qty| Reference| Description| Manufacturer| Part
Number
---|---|---|---|---
1| C2| CAP 33,000PF 50V CERM X7R 0805| Panasonic®| ECJ-2VB1H333K
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| Microchip Technology Inc.| 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: 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.
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© 2008 Microchip Technology Inc.
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