Microchip Technology MCP73871 Manuel utilisateur

MCP73871

Demo Board

with Voltage Proportional

Current Control

User’s Guide

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intended manner and under normal conditions.

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• Microchip is willing to work with the customer who is concerned about the integrity of their code.

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and manufacture of development systems is ISO 9001:2000 certified.

MCP73871 DEMO BOARD WITH

VOLTAGE PROPORTIONAL CURRENT

CONTROL USER’S GUIDE

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 What is the MCP73871 Demo Board with Voltage Proportional Current

Control? .................................................................................................... 6

1.3 What the MCP73871 Demo Board with Voltage Proportional Current Control

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 .................................................................................................. 13

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

A.3 Board – Top Silk and Pads .......................................................................... 15

A.4 Board – Top Metal Layer ............................................................................. 16

A.5 Board – Bottom Layer .................................................................................. 17

Appendix B. Bill of Materials (BOM)

Worldwide Sales and Service .................................................................................... 20

MCP73871 Demo Board with Voltage Proportional Current Control User’s Guide

NOTES:

MCP73871 DEMO BOARD WITH

VOLTAGE PROPORTIONAL

CURRENT CONTROL USER’S GUIDE

Preface

INTRODUCTION

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

MCP73871 Demo Board with Voltage Proportional Current Control. 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 MCP73871 Demo Board with Voltage

Proportional Current Control as a linear Li-Ion battery charge controller that can share

a load. The manual layout is as follows:

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

Demo Board with Voltage Proportional Current Control.

•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 Demo Board with Voltage Proportional Current

Control.

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

MCP73871 Demo Board with Voltage Proportional Current Control.

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 Demo Board with Voltage Proportional Current Control User’s Guide

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

RECOMMENDED READING

This user's guide describes how to use MCP73871 Demo Board with Voltage

Proportional Current Control. Other useful documents are listed below. The following

Microchip documents are available and recommended as supplemental reference

resources.

• MCP73871 Data Sheet - “Stand-Alone System Load Sharing and Li-Ion /

Li-Polymer Battery Charge Management Controller”, DS22090

This data sheet provides detailed information regarding the MCP73871 product family.

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.

MCP73871 Demo Board with Voltage Proportional Current Control User’s Guide

DOCUMENT REVISION HISTORY

Revision B (November 2009)

Initial Release of this Document.

• Updated Section 2.2 “Features” with information on the Voltage Proportional

Current Control Input Voltage.

• Added footnote to Table 2-1.

• Updated Section 2.3.3 “Voltage Proportional Charge Control (VPCC)

Function”.

• Added Section 2.3.3.1 “Example”.

Revision A (April 2009)

• Initial Release of this Document.

MCP73871 DEMO BOARD WITH

VOLTAGE PROPORTIONAL

CURRENT CONTROL USER’S GUIDE

Chapter 1. Product Overview

1.1 INTRODUCTION

The MCP73871 Demo Board with Voltage Proportional Current Control is designed to

demonstrate Microchip's stand-alone linear Li-Ion battery charger with system power

path and load sharing management control solution. The MCP73871 integrates the

required elements to meet design challenges when developing new Li-Ion / Li-Polymer

batteries 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 and supports the

required system load current. The MCP73871 Demo Board with Voltage Proportional

Current Control feature added is developed to assist engineers 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 Demo Board with Voltage

Proportional Current Control and covers the following topics:

• What is the MCP73871 Demo Board with Voltage Proportional Current Control?

• What the MCP73871 Demo Board with Voltage Proportional Current Control Kit

includes?

FIGURE 1-1: MCP73871 With System Power Path and Voltage Proportional Current Control

(VPCC) Management Typical Application.

System

Load

Low Hi

CE VSS

STAT2

SEL

STAT1

VPCC

PROG2

LBO

Single-Cell

Li-Ion

Battery

OUT

VBAT

THERM

VBAT_SENSE

PROG3

PROG1

1, 20

14, 15, 16

18, 19

10,11 (EP)

OUT

NTC

10 F4.7 F

4.7 F

110 k

10 k

RPROG3

RPROG1

470

AC-DC Adapter

or USB Port

MCP73871

330 k

MCP73871 Demo Board with Voltage Proportional Current Control User’s Guide

1.2 WHAT IS THE MCP73871 DEMO BOARD WITH VOLTAGE PROPORTIONAL

CURRENT CONTROL?

The MCP73871 Demo Board with Voltage Proportional Current Control demonstrates

the features of Microchip’s MCP73871 “Stand-Alone System Load Sharing and Li-Ion

/ Li-Poly Battery Charge Management Controller”.The MCP73871 Demo Board with

Voltage Proportional Current Control 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 Demo

Board with Voltage Proportional Current Control has one dip switch (S1) with four poles

to control input current limits, enable charge timer and enable charging. The first switch

decides the input power source between AC-DC wall adapter and USB port (AC/USB).

The second switch of S1 determines the 500 mA high-power USB port or the 100 mA

low-power USB port (High/Low), if the first switch of S1 is enabled (ON). The input

current limit is governed by the USB specification when selecting USB on S1 switch.

The maximum fast current when AC is selected on S1 is programmed by the resistor

RPROG1 at 1A, and the termination current is set at 100 mA by RPROG3

(see Figure 1-1).

The MCP73871 Demo Board with Voltage Proportional Current Control offers three

status LED (for charge status outputs and a power-good indicator).

The MCP73871 Demo Board with Voltage Proportional Current Control comes with a

factory preset low-battery indicator (LBO) when input is absent. The preset value is

3.2V and STAT1 LED (Green) will turn ON if the battery voltage is below the threshold

voltage.

The MCP73871 Demo Board with Voltage Proportional Current Control is designed to

cover all the features of the MCP73871 device. A thermistor can be added at test points

TP6 and TP7, but resistor R6 must be removed (see the A.2 “Board – Schematic”).

The board layout easily permit to change the two programmable resistors: RPROG1 and

RPROG3.

1.3 WHAT THE MCP73871 DEMO BOARD WITH VOLTAGE PROPORTIONAL

CURRENT CONTROL KIT INCLUDES?

This MCP73871 Demo Board with Voltage Proportional Current Control kit includes:

• One MCP73871 Demo Board with Voltage Proportional Current Control,

102-00244

• Important Information "Read First"

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

current setups.

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