Microchip Technology MCP73871 Manual de usuario

MCP73871

Evaluation Board

User’s Guide

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MCP73871 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 MCP73871 Evaluation Board? ....................................................6

1.3 What the MCP73871 Evaluation Board Kit includes ......................................6

Chapter 2. Installation and Operation

2.1 Introduction .....................................................................................................7

2.2 Features .........................................................................................................7

2.3 Getting Started ...............................................................................................8

Appendix A. Schematic and Layouts

A.1 Introduction ..................................................................................................11

A.2 Board – Schematic .......................................................................................12

A.3 Board – Top Layer .......................................................................................13

A.4 Board – Top Metal Layer .............................................................................13

A.5 Board – Bottom Layer .................................................................................14

Appendix B. Bill Of Materials (BOM)

Worldwide Sales and Service .................................................................................... 16

MCP73871 Evaluation Board User’s Guide

NOTES:

MCP73871 EVALUATION BOARD

USER’S GUIDE

Preface

INTRODUCTION

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

MCP73871 Evaluation Board User’s Guide. 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 howtouse the MCP73871EvaluationBoardUser’sGuideas

a development tool to emulate and debug firmware on a target board. The manual lay-

out is as follows:

•Chapter 1. “Product Overview” – Important information about the MCP73871

Evaluation Board User’s Guide.

•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 MCP73871 Evaluation Board User’s Guide.

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

MCP73871 Evaluation Board User’s Guide.

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.

MCP73871 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 MCP73871 Evaluation Board User’s Guide.

The following Microchip documents are available and recommended as supplemental

reference resources.

MCP73871 Data Sheet, “Stand-Alone Linear Li-Ion / Li-Poly Battery Charge and

System Load Sharing Management Controller”, DS22090

This data sheet provides detailed information regarding the MCP73871 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 (August 2008)

• Initial Release of this Document.

MCP73871 Evaluation Board User’s Guide

NOTES:

MCP73871 EVALUATION BOARD

USER’S GUIDE

Chapter 1. Product Overview

1.1 INTRODUCTION

Space and complexity are two key concerns in portable electronic design. The highly

integrated MCP73871 device has overcome the hurdles by including the required ele-

ments to meet the design challenges when developing new Li-Ion / Li-Polymer battery

powered products.

The MCP73871 requires minimum external components to power the system load and

charge single cell Li-Ion batteries independently. When input power is absent or

insufficient, the Li-Ion battery becomes the primary power source or in help mode to

support the required system load current. The MCP73871 Evaluation Board is

developed to assist product designers in reducing product design cycle and time by

utilizing Microchip’s favorite stand-alone Li-Ion battery charger and system load

sharing management controller.

This chapter provides an overview of the MCP73871 Evaluation Boardand covers the

following topics:

• “What is the MCP73871 Evaluation Board?”

• “What the MCP73871 Evaluation Board Kit includes”

FIGURE 1-1: MCP73871 With System Power Path Management Application.

STAT1

LBO

IN OUT

VBAT

Single-Cell

Li-Ion Battery

MCP73871 Typical Application

1, 20

18, 19

10 µF

10, 11, EP

Ac-dc Adapter

USB Port

STAT2 THERM

VSS

PROG1

PROG3 12

13 RPROG1

14, 15, 16

470Ω

24.7 µF

System

Load

SEL

PROG2

Low

RPROG3

VPCC

NTC

10 kΩ

Low 17 CE

4.7 µF

MCP73871 Evaluation Board User’s Guide

1.2 WHAT IS THE MCP73871 EVALUATION BOARD?

TheMCP73871EvaluationBoarddemonstratesthefeaturesofMicrochip’sMCP73871

“Stand-alone LinearLi-Ion / Li-Poly Battery Charge and System LoadSharing Manage-

ment Controller”.

The MCP73871 Evaluation Board is designed to deliver minimum 1.5A total current to

system load and to a single cell Li-Ion battery at 4.2V preset voltage regulation. (4.1V,

4.35V and 4.4V options are also available for MCP73871) The MCP73871 Evaluation

Board has two dip switches to control input current limits. First dip switch (SW2)

determines input power source between ac-dc adapter and USB port (AC/USB).

Second dip switch (SW1) determines 500 mA high power USB port or 100 mA low

power USB port (High/Low). The input current limit is governed by USB specification

when selecting USB on SW2.

The maximum fast current when AC is selected on SW2 is programmed by resistor

(RPROG1) at 1A and termination current is set at 100 mA by (RPROG3).

TheMCP73871EvaluationBoardoffersthreestatusLEDfortwocharge status outputs

and a power good indicator.

The MCP73871 Evaluation Board comes with factory preset low battery indicator

(LBO) when input is absent. The preset value is 3.1V and STAT1 LED turns on when

battery voltage is below the threshold voltage.

TheMCP73871Evaluation Board isdesigned toobservetheperformanceandfeatures

on the circuits via multiple test points. Circuits can also be implemented into suitable

applications without additional work.

1.3 WHAT THE MCP73871 EVALUATION BOARD KIT INCLUDES

This MCP73871 Evaluation Board kit includes:

• MCP73871 Evaluation Board, 102-00183

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

- MCP73871 Evaluation Board User’s Guide User’s Guide (DS51755)

- MCP73871 Data Sheet, “Stand-Alone Linear Li-Ion / Li-Poly Battery Charge

and System Load Sharing Management Controller” (DS22090)

Note: Please refer to Table 2-1 for charge status outputs and Figure 2-1 for

charge current setups.

Note: For evaluation LBO purpose, connect a DC power supply and set VDD

below UVLO. The LBO lights up when VBAT drops below threshold voltage.

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