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MCP7381X

Low-Cost Li-Ion Battery

Charger Evaluation Board

User’s Guide

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and may be superseded by updates.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.

Trademarks

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

dsPIC, KEE EELOQ, K LOQ logo, MPLAB, PIC, PICmicro,

PICSTART, PRO MATE, rfPIC and SmartShunt 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, PIC32 logo, PowerCal, PowerInfo,

PowerMate, PowerTool, REAL ICE, rfLAB, Select Mode, Total

Endurance, UNI/O, 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.

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.

Microchip received ISO/TS-16949:2002 certification for its worldwide

headquarters, design and wafer fabrication facilities in Chandler and

Tempe, Arizona; Gresham, Oregon and design centers in California

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.

MCP7381X LI-ION BATTERY CHARGER

EVALUATION BOARD USER’S GUIDE

Table of Contents

Preface ........................................................................................................................... 1

Introduction............................................................................................................ 1

Document Layout .................................................................................................. 1

Conventions Used in this Guide ............................................................................ 2

Recommended Reading........................................................................................ 2

The Microchip Web Site ........................................................................................ 3

Customer Support ................................................................................................. 3

Document Revision History ................................................................................... 3

Chapter 1. Product Overview

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

1.2 What is the MCP7381X Li-Ion Battery Charger Evaluation Board? ............... 7

1.3 What the MCP7381X Li-Ion Battery Charger Evaluation Board Kit Includes . 7

Chapter 2. Installation and Operation

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

2.2 Features ......................................................................................................... 9

2.3 Getting Started ............................................................................................. 10

Appendix A. Schematic and Layouts

A.1 Introduction .................................................................................................. 13

A.2 Board – Schematic ....................................................................................... 14

A.3 Board – Top Layer ....................................................................................... 15

A.4 Board – Top Metal Layer ............................................................................. 15

A.5 Board – Bottom Layer ................................................................................. 16

Appendix B. Bill Of Materials (BOM)

Worldwide Sales and Service .................................................................................... 18

MCP7381X Li-Ion Battery Charger Evaluation Board User’s Guide

NOTES:

MCP7381X LI-ION BATTERY CHARGER

EVALUATION BOARD USER’S GUIDE

Preface

INTRODUCTION

This chapter contains general information that will be useful to know before using the

MCP7381X Li-Ion Battery Charger Evaluation 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 MCP7381X Li-Ion Battery Charger Evaluation

Board as a development tool to emulate and debug firmware on a target board. The

manual layout is as follows:

•Chapter 1. “Product Overview” – Important information about the MCP7381X

Li-Ion Battery Charger Evaluation Board.

•Chapter 2. “Installation and Operation” – Includes instructions on how to get

started with this user’s guide and a description of the user’s guide.

•Appendix A. “Schematic and Layouts” – Shows the schematic and layout

diagrams for the MCP7381X Li-Ion Battery Charger Evaluation Board.

•Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the

MCP7381X Li-Ion Battery Charger Evaluation 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.

MCP7381X Li-Ion Battery Charger Evaluation Board User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

RECOMMENDED READING

This user's guide describes how to use MCP7381X Li-Ion Battery Charger Evaluation

Board. The following Microchip documents are available and recommended as

supplemental reference resources.

MCP73811/2 Data Sheet, “Simple, Miniature Single-Cell, Fully Integrated Li-Ion /

Li-Polymer Charge Management Controllers”, DS22036

This data sheet provides detailed information regarding the MCP73811/2 product

family.

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

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 (April 2008)

• Initial Release of this Document.

MCP7381X Li-Ion Battery Charger Evaluation Board User’s Guide

NOTES:

MCP7381X LI-ION BATTERY CHARGER

EVALUATION BOARD USER’S GUIDE

Chapter 1. Product Overview

1.1 INTRODUCTION

The MCP7381X Li-Ion Battery Charger Evaluation Board demonstrates the features

and abilities for Microchip’s MCP7381X Li-Ion Battery Charger Evaluation Board Sim-

ple, Miniature Single-Cell, Fully Integrated Li-Ion / Li-Polymer Charge Management

Controllers. The MCP73811/2 are standalone highly integrated linear Li-Ion battery

chargers that employ a constant current/constant voltage (CCCV) charge algorithm for

cost sensitive and space limited applications.

The MCP7381X Li-Ion Battery Charger Evaluation Board has two independent circuits

that are available to evaluate an USB port powered Li-Ion / Li-Polymer battery charger

and an ac-dc wall adapter powered Li-Ion / Li-Polymer battery charger. For an ac-dc

wall adapter powered battery charger, an external resistor (RPROG) sets the magnitude

of the charge current up to 500 mA. When the USB port provides power to the battery

charger, the MCP73811 specifically adheres to the current limits governed by the USB

specification. The PROG pin selects two preset charge current rates of typical 85 mA

(Low) or 450 mA (High) and does not exceed 100 mA (Low) or 500 mA (High)

maximum charge current. As for USB regulation, a device may draw either low-power

at one unit load or high-power at 5 unit loads. A unit load is defined to be 100 mA. The

drawn current per unit load is an absolute maximum value, not an average over time.

This chapter covers the following topics:

• “What is the MCP7381X Li-Ion Battery Charger Evaluation Board?”

• “What the MCP7381X Li-Ion Battery Charger Evaluation Board Kit includes.”

FIGURE 1-1: MCP73812 Typical Application.

VDD

VSS

PROG

VBAT +

Single

Li-Ion

Cell

MCP73812

CIN

Li-Ion Battery Charger

RPROG

COUT

REGULATED

WALL CUBE

MCP7381X Li-Ion Battery Charger Evaluation Board User’s Guide

FIGURE 1-2: Typical MCP73812 Charge Profile (950 mAh Li-Ion Battery Pack).

FIGURE 1-3: Typical MCP73811 Applications.

0.0

1.0

2.0

3.0

4.0

5.0

105

120

135

150

165

180

Time (Minutes)

Battery Voltage (V)

100

200

300

400

500

Charge Current (mA)

MCP73812T-420I/OT

VDD = 5.0V

PROG

= 2 kΩ

VDD

VSS

PROG

VBAT

Single

Li-Ion

Cell

MCP73811

1 µF

500 mA Li-Ion Battery Charger

VIN

1 µF

Product Overview

1.2 WHAT IS THE MCP7381X LI-ION BATTERY CHARGER EVALUATION

BOARD?

The MCP7381X Li-Ion Battery Charger Evaluation Board demonstrates the use of the

MCP73811/2 Simple, Miniature Single-Cell, Fully Integrated Li-Ion / Li-Polymer

Charger Management Controllers.

The MCP7381X Li-Ion Battery Charger Evaluation Board is setup to evaluate low cost

single-cell Li-Ion / Li-Polymer battery chargers. This board utilizes Microchip's

MCP7381X Li-Ion Battery Charger Evaluation Board that efficiently charge Li-Ion /

Li-Polymer batteries with a preset +1% voltage accuracy regulation at 4.2V. The

MCP7381X Li-Ion Battery Charger Evaluation Board comes with two pre-installed cir-

cuits: An ac-dc adapter powered Li-Ion /Li-Polymer battery charger and an USB port

powered Li-Ion / Li-Polymer battery charger.

The MCP73811 is available for the USB port powered circuit while the MCP73812 is

designed for the ac-dc wall adapter powered circuit. A SOT-23-5 MCP73811 is

pre-installed on the evaluation board with a mechanical dip switch which selects charge

current High (450 mA) or Low (85 mA) for the USB port powered battery charger

system. A SOT23-5 MCP73812 is pre-installed on the evaluation board with a pro-

gramming resistor RPROG which delivers 500 mA from the ac-dc wall adapter source.

When the Chip Enable (CE) pin is in “High” condition, that particular circuit is ready to

charge single-cell Li-Ion batteries.

The two dashed silk screen areas on the evaluation board show the required circuit

size for the printed circuit board (PCB) layout and provide system / product designers

a visual aid prior design the system.

The MCP7381X Li-Ion Battery Charger Evaluation Board is designed to observe the

performance and features via multiple test points that are available on the circuits.

Users are able to discover the compact size of the layout in addition to the device itself.

The circuit can also be implemented into suitable applications without any additional

works.

1.3 WHAT THE MCP7381X LI-ION BATTERY CHARGER EVALUATION BOARD

KIT INCLUDES

The MCP7381X Li-Ion Battery Charger Evaluation Board kit includes:

• MCP7381X Li-Ion Battery Charger Evaluation Board, 102-00172

• Pre-installed 5-Lead SOT-23 MCP73811, 5-Lead SOT-23 MCP73812 and

required components.

• Analog and Interface Products Demonstration Boards CD-ROM (DS21912)

- MCP7381X Li-Ion Battery Charger Evaluation Board User’s Guide,

(DS51729)

- MCP73811/2 Data Sheet, “Simple, Miniature Single-Cell, Fully Integrated

Li-Ion / Li-Polymer Charge Management Controllers”, (DS22036)

Note: The systems are designed in operation mode with CE pin High and can be

disabled when driving CE pin Low.

MCP7381X Li-Ion Battery Charger Evaluation Board User’s Guide

NOTES:

Produktspezifikationen

Marke:	Microchip
Kategorie:	Nicht kategorisiert
Modell:	MCP73812

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