Page 1
MCP73855
Evaluation Board
User’s Guide
2004 Microchip Technology Inc. DS51522A
Page 2
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 Digit al Millennium Copyright Act. If suc h a c t s
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and may be superseded by updates.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 M icrochip’s prod ucts as critical co mponents in
life support systems is not authorized except with express
written approval by Microchip. No licenses are conveyed,
implicitly or otherwise, under any Microchip intellectual property
rights.
Trademarks
The Microchip name and logo, the Microchip logo, Accuron,
dsPIC, K
EELOQ, microID, MPLAB, PIC, PICmicro,
PICSTART, PRO MATE, PowerSmart, rfPIC, and
SmartShunt are registered trademarks of Microchip
Technology Incorporated in the U.S.A. and other countries.
AmpLab, FilterLab, MXDEV, MXLAB, PICMASTER, 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, dsPICDEM,
dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR,
FanSense, FlexROM, fuzzyLAB, In-Circuit Serial
Programming, ICSP, ICEPIC, Migratable Memory, MPASM,
MPLIB, MPLINK, MPSIM, PICkit, PICDEM, PICDEM.net,
PICLAB, PICtail, PowerCal, PowerInfo, PowerMate,
PowerTool, rfLAB, rfPICDEM, Select Mode, Sm art Serial,
SmartTel and Total Endurance 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.
© 2004, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received ISO/TS-16949:2002 quality system certification for
its worldwide headquarters, design and wafer fabrication facilities in
Chandler and Tempe, Arizona and Mountain View, California in
October 2003. The Company’s quality system processes and
procedures are for its PICmicro
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.
®
8-bit MCUs, KEELOQ
®
code hopping
DS51522A-page ii 2004 Microchip Technology Inc.
Page 3
MCP73855 EVALUATION
BOARD USER’S GUIDE
Tabl e of Contents
Preface ...........................................................................................................................1
Chapter 1. Product Overview........................................................................................5
1.1 Introduction and Highlights ....................................................................... 5
1.2 What is the MCP73855 Evaluation Board? ..............................................5
1.3 What the MCP73855 Evaluation Board Kit Includes .............................. .. 5
Chapter 2. MCP73855 Evaluation Board Installation..................................................7
2.1 Features ................................................................................................... 7
2.2 Getting Started ......................................................................................... 7
2.3 Detailed Description ................................................................................. 8
Appendix A. Schematic and Layouts ........................................................................11
A.1 Introduction .............................................................................................11
A.2 Board Schematic .................................................................................. 12
A.3 Board - Assemb ly Drawing ............................. .. ........................... .. ....... 13
A.4 Board - Top Layer .................................................................................13
A.5 Board - Bottom Layer ............................................................................14
Appendix B. Bill-Of-Materials (BOM) .........................................................................15
Worldwide Sales and Service ....................................................................................16
2004 Microchip Technology Inc. DS51522A-page iii
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MCP73855 Evaluation Board User’s Guide
NOTES:
DS51522A-page iv 2004 Microchip Technology Inc.
Page 5
MCP73855 EVALUATION
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 dif fer from those in this document. Please refer
to our web site (www.microchip.com) to obt ain 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
on-line help. Select the Help menu, and then Topics to open a list of available on-line
help files.
®
IDE
INTRODUCTION
This chapter contains general information that will be useful to know before using the
MCP73855 Evaluation Board. Items discussed in this chapter include:
• About This Guide
• Recommended Reading
• The Microchip Web Site
• Customer Support
2004 Microchip Technology Inc. DS51522A-page 1
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MCP73855 Evaluation Board User’s Guide
ABOUT THIS GUIDE
Document Layout
This document describes how to use the MCP73855 Evaluation Board. The manual
layout is as follows:
• Chapter 1: Product Overview – important information about the MCP73855
Evaluation Board.
• Chapter 2: MCP73855 Evaluation Board Installation – for users evaluating the
MCP73855, this chapter describes how to use the various features of the
hardware.
• Appendix A: Schematic and Layouts – shows the schematic and layout
diagrams for the MCP73855 Evaluation Board.
• Appendix B: Bill-of-Materials – lists the parts used to build the MCP73855
Evaluation Board.
DS51522A-page 2 2004 Microchip Technology Inc.
Page 7
Preface
Conventions Used in this Guide
This manual uses the following docum entation conventions:
DOCUMENTATION CONVENTIONS
Description Represents Examples
Arial font:
Italic charac ters Referenced books MPLAB
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
‘bnnnn A binary number where n is a
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
0xnnnn A hexadecimal number whe re
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
digit
Filenames autoexec.bat
File paths c:\mcc18\h
Keywords _asm, _endasm, static
Command-line options -Opa+, -Opa-
Bit values 0, 1
n is a hexadecimal digit
Choice of mut ually exclu s ive
arguments; an OR selection
Represents code supplied by
user
“Save project before build”
‘b00100, ‘b10
any valid filename
0xFFFF, 0x007A
[options]
errorlevel {0|1}
var_name...]
void main (void)
{ ...
}
®
IDE User’s Guide
2004 Microchip Technology Inc. DS51522A-page 3
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MCP73855 Evaluation Board User’s Guide
RECOMMENDED READING
This user's guide describes how to use the MCP73855 Evaluation Board. Other useful
documents are listed below. The following Microchip documents are available and
recommended as supplemental reference resources.
MCP73853/55 Data Sheet (DS21915)
This dat a sheet provides detailed information regarding the MCP7385X devices.
THE MICROCH IP 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 (FAQ), 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
• Development Systems Information Line
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
In addition, there is a Development Systems Information Line which lists the latest
versions of Microchip's development systems software products. This line also
provides information on how customers can receive currently available upgrade kits.
The Development Systems Information Line numbers are:
1-800-755-2345 – United States and most of Canada
1-480-792-7302 – Other Internatio nal Loca tio ns
DS51522A-page 4 2004 Microchip Technology Inc.
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MCP73855 EVALUATION
BOARD USER’S GUIDE
Chapter 1. Product Overview
1.1 INTRODUCTION AND HIGHLIGHTS
This chapter provides an overview of the MCP73855 Evaluation Board and covers the
following topics:
• What is the MCP73855 Evaluation Board?
• What the MCP73855 Evaluation Board Kit Includes
1.2 WHAT IS THE MCP73855 EVALUATION BOARD?
The MCP73855 Evaluation Board is an evaluation and demonstration tool for Microchip
Technology’s MCP73855 USB Compatible Li-Ion/Li-Polymer Charge Management
Controller. The design provides for dynamic versatility while being able to handle
accurate measurements.
The MCP73855 Evaluation Board allows for the evaluation of the MCP73855 device in
a variety of applications.
1.3 WHAT THE MCP73855 EVALUATION BOARD KIT INCLUDES
This MCP73855 Evaluation Board Kit includes:
• The MCP73855 Evaluation Board (102-00040)
• MCP73855 Device (Installed)
• MCP73853/55 Data Sheet (DS21915)
• MCP73855 Evaluation Board User’s Guide (DS51522)
2004 Microchip Technology Inc. DS51522A-page 5
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MCP73855 Evaluation Board User’s Guide
NOTES:
DS51522A-page 6 2004 Microchip Technology Inc.
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MCP73855 EVALUATION
BOARD USER’S GUIDE
Chapter 2. MCP73855 Evaluation Board Installation
2.1 FEATURES
The MCP73855 Evaluation Board has the following features:
• Evaluation of the MCP73855 USB Compatible Li-Ion/Li-Polymer Charge
Management Controller in a 3mm x 3mm, 10-Lead DFN Package
• Simple, stand-alone operation or microcontroller-compatible
• Powered from external bench supply, wall cube or USB port
• Surface-mount design
• Fully assembled and tested
2.2 GETTING STARTED
The MCP73855 Evaluation Board is a fully-functional, assembled and tested, surface-mount board used for evaluation of Microchip’s MCP73855 USB Compatible
Li-Ion/Li-Polymer Charge Management Controller. The following steps provide simple,
stand-alone operation. Refer to Figure 2-1 for the setup configuration diagram. The
setup configuration diagram depicts evaluation of the installed MCP73855 for
single-cell applications.
1. Connect an external bench supply, wall cube or USB port to the surface-mount
test points provided. The input voltage source should be in the range of 4.5V to
5.5V. Refer to Section 2.3.1 “Input Source” for details on the input source
requirements.
Note: Observe correct polarity of connection. Positive terminal
connects to J2, V
2. Connect a single-cell Li-Ion or Li-Polymer battery pack to the circuit for
evaluation.
Note: Observe correct polarity of connection. Positive terminal con-
nects to J5, V
3. Turn on the bench supply or plug in the wall cube/USB port.
4. A green LED (D
MCP73853/55 data sheet (DS21915) for details.
) provides status during the charge cycle. Refer to the
1
+; negative terminal connects to J3, VIN-.
IN
+; negative terminal connects to J6, V
BAT
BAT
-.
2004 Microchip Technology Inc. DS51522A-page 7
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MCP73855 Evaluation Board User’s Guide
Regulated
Wall Cube
FIGURE 2-1: Setup Configuration Diagram .
2.3 DETAILED DESCRIPTION
The MCP73855 Evaluation Board is set-up to evaluate simple, stand-alone, linear
charging of single-cell Li-Ion/Li-Polymer battery packs. The reference design provides
constant current charging followed by constant voltage charging with automatic charge
termination. As provided, the MCP73855 Evaluation Board is set for fast charge
constant current levels of 85 mA with J4 (PROG) open and 400 mA with J4 (PROG)
connected to J3 (V
package and is equipped with shutdown control, status indicator and safety timer. Refer
to the MCP73853/55 data sheet (DS21915) for details on individual device features.
–). The MCP73855 is provided in a 3 mm X 3 mm, 10-lead DFN
IN
+
Single
Lithium-Ion
–
Cell
2.3.1 Input Source
The MCP73855 Evaluation Board is designed to provide a fast charge current up to
400 mA, typically. The input source should provide a voltage in the range of 4.5V to
5.5V. The input source should be capable of providing a minimum of 2.5W.
Charge currents between 85 mA and 400 mA can be obtained by adjusting the value
of the charge programming resistors (R
(PROG) to J3 (V
–). Refer to the MCP73853/55 data sheet (DS21915) for details on
IN
) and connecting surface-mount test point J4
2
determining the appropriate programming resistor.
2.3.2 Safety Timer Periods
The MCP73855 Evaluation Board can be used with a variety of battery packs. As
provided, the MCP73855 Evaluation Board is set up to perform well with single-cell,
100 mAh to 500 mAh battery packs. Battery packs with alternative capacities and
various charge currents can be implemented. The safety timer periods may need to be
adjusted in order to ensure a full charge. The safety timer periods can be adjusted by
changing the capacitance of C
. Refer to the MCP73853/55 data sheet (DS21915) for
3
details on determining the appropriate timer capacitance.
2.3.3 Disable Control
The MCP73855 Evaluation Board is designed to provide stand-alone operation. The
installed MCP73855 device is enabled whenever the input source is present. To
disable charging, a jumper can be placed between J1 (EN) and J3 (V
IN
–).
DS51522A-page 8 2004 Microchip Technology Inc.
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MCP73855 Evaluation Board User’s Guide
2.3.4 Battery Headers
Independent battery connections are provided. The battery pack positive terminal
should be connected to J5 (V
connected to J6 (V
Note: Improper connection of the battery may result in damage to the
battery and the possibility of personal injury. It is also important to
avoid shorting the battery terminals together.
BAT
–).
2.3.5 Device Support Options
The MCP73855 Evaluation Board supports the MCP73855 device. The MCP73855
Evaluation Board is provided with one reference design utilizing the MCP73855.
2.3.6 Microcontroller option
Connection points provide easily accessible locations for interface to a host
microcontroller. The host microcontroller can be used to disable the charger, monitor
charge status or terminate a charge.
2.3.7 Output voltage options
+). The battery pack’s negative terminal should be
BAT
The MCP73855 Evaluation Board is provided with a Constant-voltage mode output
voltage of 4.2V. Evaluation with a Constant-voltage mode output voltage of 4.1V can
be achieved by moving resistor R
to R3, or by shorting the R3 pads.
4
2004 Microchip Technology Inc. DS51522A-page 9
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MCP73855 Evaluation Board User’s Guide
NOTES:
DS51522A-page 10 2004 Microchip Technology Inc.
Page 15
Appendix A. Schematic and Layouts
A.1 INTRODUCTION
This appendix contains the following schematics and layout diagrams for the
MCP73855 Evaluation Board.
Diagrams included in this appendix:
• Board Schematic
• Board - Assembly Drawing
• Board - Top Layer
• Board - Bottom Layer
MCP73855 EVALUATION
BOARD USER’S GUIDE
2004 Microchip Technology Inc. DS51522A-page 11
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MCP73855 Evaluation Board User’s Guide
A.2 BOARD SCHEMATIC
1
J5
8
VDD13EN
U1
1
J6
VBAT+
C2
4.7uF
4
7
11
V SS1
V SS2
VBAT29VBAT1
EXPAD
TIMER
STA T 1
VSET
6
1
5
2
10
VBAT-
PR OG
MCP73855/DF N (10)
1
J4
PR OG
R2
0
D1
GRE E N
R4
100k
R5
100k
R1
DNP
C1
4.7uF
1
J2
VIN+
1
J3
R3
DNP
C3
0.1uF
EN
1
J7
TIMER
1
VIN-
J1
DS51522A-page 12 2004 Microchip Technology Inc.
Page 17
A.3 BOARD - ASSEMBLY DRAWING
A.4 BOARD - TOP LAYER
2004 Microchip Technology Inc. DS51522A-page 13
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MCP73855 Evaluation Board User’s Guide
A.5 BOARD - BOTTOM LAYER
DS51522A-page 14 2004 Microchip Technology Inc.
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MCP73855 EVALUATION
BOARD USER’S GUIDE
Appendix B. Bill-Of-Materials (BOM)
TABLE B-1: BILL-OF-MATERIALS (BOM)
Qty
2 C1, C2 4.7 uF, X5R Ceramic, 16V, 0805 Panasonic
1 C3 0.1 uF, X7R Ceramic, 16V, 0805 Panasonic ECJ-2VB1C104K
1 D1 Green LED, 0805 Lumex
7 J1 - J7 Surface Mount Test Point, 5016 Keystone
0 R1, R3 Do Not Populate, 0805 — —
1 R2 0 ohm Jumper, 0805 Panasonic ERJ-6GEY0R00V
2 R4, R5 100 kΩ, 1/10W, Chip Resistor, 0805 Panasonic ERJ-6ENF1003V
1 U1 USB Compatible Charge Controller, 3X3DFN10 Microchip
Reference
Designator
Description Manufacturer Part Number
®
ECJ-2FB1C475K
®
SML-LXT0805GW
5016
Electrionics
Technology Inc.
®
MCP73855-I/MF
2004 Microchip Technology Inc. DS51522A-page 15
Page 20
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
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Fax: 44-118-921-5820
10/20/04
DS51522A-page 16 2004 Microchip Technology Inc.
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