MCP6031 PICtail Plus Demo Board Guide Datasheet by Microchip Technology

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Q MICROCHIP
© 2008 Microchip Technology Inc. DS51763A
MCP6031
Photodiode PICtail™ Plus
Demo Board
Users Guide
QUALITY MANAGEMENT SYSTEM CERTIFIED BY DNV = ISO/TS 1694922002 =
DS51763A-page ii © 2008 Microchip Technology Inc.
Information contained in this publication regarding device
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dsPIC, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,
PICSTART, rfPIC, SmartShunt and UNI/O are registered
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ECONOMONITOR, FanSense, In-Circuit Serial
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© 2008, Microchip Technology Incorporated, Printed in the
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Printed on recycled paper.
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6‘ MICROCHIP
MCP6031 PHOTODIODE PICtail™
PLUS DEMO BOARD USERS GUIDE
© 2008 Microchip Technology Inc. DS51763A-page iii
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
DS51763A-page iv © 2008 Microchip Technology Inc.
NOTES:
6‘ MICROCHIP
MCP6031 PHOTODIODE PICtail™
PLUS DEMO BOARD USERS GUIDE
© 2008 Microchip Technology Inc. DS51763A-page 1
Preface
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 .
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.
MPLABW Hle>Sa vs
MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide
DS51763A-page 2 © 2008 Microchip Technology Inc.
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
© 2008 Microchip Technology Inc. DS51763A-page 3
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.
MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide
DS51763A-page 4 © 2008 Microchip Technology Inc.
NOTES:
Q MICROCHIP
MCP6031 PHOTODIODE PICtail™
PLUS DEMO BOARD USERS GUIDE
© 2008 Microchip Technology Inc. DS51763A-page 5
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: MCP6031 Photodiode PICtail™ Plus Demo Board Kit.
MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide
DS51763A-page 6 © 2008 Microchip Technology Inc.
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.
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:
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.
Note: For high measurement accuracy, an external stand-alone ADC with higher
resolution needs to be used.
VOUT R1
()10000 lX /70
μ
A()
L = illuminance (lx)
=
MCP6031
Explorer 16 Development Board
PN334 Photodiode
+
-
RC Low-Pass
Filter
10 Bit ADC Module VREF = 3.3V
LCD Screen
VDD = VREF
MCP603x Photodiode
PICtail™ Plus Demo Board
Transimpedance
Amplifier
PIC24FJ128 Microcontroller
Vout = ___________ V
L = ____________ lx
VOUT
IS
= 3.3V
Product Overview
© 2008 Microchip Technology Inc. DS51763A-page 7
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.
.
FIGURE 1-4: MCP6031 Photodiode PICtail™ Plus Demo Board Circuit
Diagram.
33 nF
10 kΩ
C1
Transimpedance Amplifier
Low-Pass Filter
unpopulated
U1
D1
R1 42.2 kΩ R2
C2
C3
+3.3V
VOUT
PNZ334 MCP6031 0.1 µF
MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide
DS51763A-page 8 © 2008 Microchip Technology Inc.
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
6‘ MICROCHIP Mumm-
MCP6031 PHOTODIODE PICtail™
PLUS DEMO BOARD USERS GUIDE
© 2008 Microchip Technology Inc. DS51763A-page 9
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
Explorer 16
Development
Board.
J5
MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide
DS51763A-page 10 © 2008 Microchip Technology Inc.
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.
LED
Incandescent lamp
6‘ MICROCHIP
MCP6031 PHOTODIODE PICtail™
PLUS DEMO BOARD USERS GUIDE
© 2008 Microchip Technology Inc. DS51763A-page 11
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
D o < .="" s="" ,="" 1%="" §="" sigmé,="" e:="" 5.2:="" a="" 55="" :3:="" a:="" 55="" er="" e="" n.1uumu__2="" _="" 9="" m="" )»k="" m="" emqus="" :a="" e="" 22="" 3,1="" in="" 393221="" x332="" “e="" 558="" 6:2.="" £3="">3. T243 33%: M H F a 4 mu m n n e H U 7: l4 ., H :2. .. m3 E x L, a u i 50> gmfififlkumfi an? 35:: E .521 o
MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide
DS51763A-page 12 © 2008 Microchip Technology Inc.
A.2 BOARD - SCHEMATIC
M
A®N|®®NA m {Ohmsux vrofioamoam EVE: _u_cm 0230 mg. m_g_4___________; t...
Schematic and Layouts
© 2008 Microchip Technology Inc. DS51763A-page 13
A.3 BOARD - TOP SILK LAYER
A.4 BOARD - TOP METAL AND TOP SILK LAYERS
dsualssmimlm‘
MCP6031 Photodiode PICtail™ Plus Demo Board User’s Guide
DS51763A-page 14 © 2008 Microchip Technology Inc.
A.5 BOARD - BOTTOM METAL LAYER
6‘ MICROCHIP
MCP6031 PHOTODIODE PICtail™
PLUS DEMO BOARD USERS GUIDE
© 2008 Microchip Technology Inc. DS51763A-page 15
Appendix B. Bill of Materials (BOM)
TABLE B-1: BILL OF MATERIALS (102-00219)
TABLE B-2: BILL OF MATERIALS - UNPOPULATED PARTS
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.
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.
Q ‘MICROCHIP
DS51763A-page 16 © 2008 Microchip Technology Inc.
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