Microchip Technology MCP7386X Battery Charger Evaluation Board User guide

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MCP7386X

Battery Charger

Evaluation Board

User’s Guide

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MCP7386X EVALUATION

BOARD USER’S GUIDE

Table of Contents

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

Chapter 1. Product Overview

1.1 Introduction and Highlights ............................................................................. 5

1.2 What is the MCP7386X Battery Charger Evaluation Board? ......................... 5

1.3 What the MCP7386X Battery Charger Evaluation Board Includes ................ 5

Chapter 2. Installation and Operation

2.1 Features ......................................................................................................... 7

2.2 Getting Started ............................................................................................... 7

2.3 Detailed Description ....................................................................................... 8

Appendix A. Schematic and Layouts

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

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

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

A.4 Board – Silk Screen Layer ......................................................................... 14

A.5 Board – Bottom Layer ................................................................................ 15

Appendix B. Bill Of Materials (BOM)

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

MCP7386X Evaluation Board User’s Guide

NOTES:

MCP7386X 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 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.

INTRODUCTION

This chapter contains general information that will be useful to know before using the MCP7386X 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 MCP7386X 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 MCP7386X Battery Charger Evaluation Board.

• Chapter 2. “Installation and Operation” – For users evaluating the MCP73861/2/3/4 devices, 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 MCP7386X Battery Charger Evaluation Board.

• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the MCP7386X Battery Charger Evaluation Board.

MCP7386X Evaluation Board 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

Underlined, italic text with right angle bracket

Bold characters A dialog button Click OK

Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>

Courier New font:

Plain Courier New Sample source code #define START

Italic Courier New A variable argument file.o, where file can be

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

Filenames autoexec.bat File paths c:\mcc18\h Keywords _asm, _endasm, static Command-line options -Opa+, -Opa- Bit values 0, 1 Constants 0xFF, ‘A’

Choice of mutually exclusive arguments; an OR selection

Represents code supplied by user

“Save project before build”

any valid filename

[options]

errorlevel {0|1}

var_name...]

void main (void) { ... }

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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

Preface

DOCUMENT REVISION HISTORY

Revision C (July 2006)

• Add disclaimer to Bill of Materials regarding RoHS-Compliant part numbers.

Revision B (September 2005)

• Added References to MCP73861/2/3/4.

Revision A (June 2004)

• Initial Release of this Document.

MCP7386X Evaluation Board User’s Guide

NOTES:

MCP7386X EVALUATION

BOARD USER’S GUIDE

Chapter 1. Product Overview

1.1 INTRODUCTION

This chapter provides an overview of the MCP7386X Battery Charger Evaluation Board and covers the following topics:

• What is the MCP7386X Battery Charger Evaluation Board?

• What the MCP7386X Battery Charger Evaluation Board Includes

1.2 WHAT IS THE MCP7386X BATTERY CHARGER EVALUATION BOARD?

The MCP7386X Battery Charger Evaluation Board is an evaluation and demonstration tool for Microchip Technology’s MCP7386X Advanced Single or Dual-Cell, Fully-Integrated, Lithium-Ion/Lithium-Polymer Charge Management Controllers. The design provides for dynamic versatility while being able to handle accurate measurements.

When connected, this evaluation board allows for the evaluation of the MCP7386X devices in a variety of applications.

1.3 WHAT THE MCP7386X BATTERY CHARGER EVALUATION BOARD INCLUDES

This MCP7386X Battery Charger Evaluation Board Kit includes:

• The MCP7386X Battery Charger Evaluation Board

• MCP73861 Device (Installed)

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

- MCP7386X Battery Charger Evaluation Board User’s Guide

MCP7386X Evaluation Board User’s Guide

NOTES:

Chapter 2. Installation and Operation

2.1 FEATURES

The MCP7386X Battery Charger Evaluation Board has the following features:

• Evaluation of MCP7386X devices in 4 x 4, 16-lead QFN packages

• Simple, stand-alone operation or microcontroller-compatible

• Powered from external bench supply or wall cube

• Surface-mount design

• Fully assembled and tested

2.2 GETTING STARTED

The MCP7386X Battery Charger Evaluation Board is a fully-functional, assembled and tested surface-mount board for evaluation of Microchip’s MCP7386X Advanced Single or Dual-Cell, Fully Integrated Lithium-Ion/Lithium-Polymer Charge Management Controllers. 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 MCP73861 for single-cell applications.

1. Connect an external bench supply or wall cube to the surface-mount test points provided. The input voltage source should be in the range of 5V to 12V. Refer to

Section 2.3.1 “Input Source” for details on the input source requirements.

MCP7386X EVALUATION

BOARD USER’S GUIDE

Note: Observe correct polarity of connection. Positive terminal connects to J2

+); negative terminal connects to J3 (VIN–).

2. Connect a single-cell Lithium-Ion or Lithium-Polymer battery pack to the circuit for evaluation.

Note: Observe correct polarity of connection. Positive terminal connects to J5

+); negative terminal connects to J6 (V

BAT

3. Connect an external battery pack thermistor to the J7 (THERM) input. The thermistor should be connected from J7 (THERM) to J6 (V cell temperature monitoring is not desired, place a 10 kΩ resistor from THERM to V

4. Turn on the bench supply or plug in the wall cube.

5. A green LED (D indicates a Fault condition. Refer to the MCP73861/2/3/4 data sheet (DS21893) for details.

–, or populate R5 with a 10 kΩ resistor.

BAT

) provides status during the charge cycle. A red LED (D2)

BAT

–).

–). If continuous

BAT

MCP7386X Evaluation Board User’s Guide

Unregulated

Wall Cube

FIGURE 2-1: Setup Configuration Diagram.

2.3 DETAILED DESCRIPTION

The MCP7386X Battery Charger Evaluation Board is set up to evaluate simple, stand-alone, linear charging of single/dual-cell Lithium-Ion/Lithium-Polymer battery packs. The reference design provides constant current charging, followed by constant voltage charging with automatic charge termination. As provided, the MCP7386X Battery Charger Evaluation Board is set for a fast charge, constant current level of

1.2A, typical for single-cell applications. The MCP73861 is provided in a 4 x 4, 16-lead QFN package and is equipped with shutdown control, status indicator, fault indicator, safety timer and a continuous cell temperature monitor. For dual-cell applications, the MCP73862 or MCP73864 can be substituted for the MCP73861. Refer to the MCP73861/2/3/4 data sheet (DS21893) for details on the individual device features.

Single Lithium-Ion

Cell

2.3.1 Input Source

The MCP7386X Battery Charger Evaluation Board is designed to provide a fast charge current of 1.2A, typical. The input source should provide a voltage in the range of 5V to 12V. The input source should be capable of providing a minimum of 7.5W.

Lower peak currents can be obtained by adjusting the value of the charge programming resistors (R

). A corresponding lower-power input source may then be utilized. Refer

to the MCP73861/2/3/4 data sheet (DS21893) for details on determining the appropriate programming resistor.

2.3.2 Safety Timer Periods

The MCP7386X Battery Charger Evaluation Board can be used with a variety of battery packs. As provided, the MCP7386X Battery Charger Evaluation Board is set up to perform well with single-cell, 1000 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 MCP73861/2/3/4 data

sheet (DS21893) for details on determining the appropriate timer capacitance.

2.3.3 Disable Control

The MCP7386X Battery Charger Evaluation Board is designed to provide stand-alone operation. The installed MCP73861 device is enabled whenever the input source is present. To disable charging, a jumper can be placed between J1, EN and J3 (V

–).

Installation and Operation

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 +25°C NTC thermistor, situated in the battery pack for temperature sensing. When the cell temperature is between -5°C and +55°C, installed resistors provide a charging window when a thermistor with a sensitivity index (β) of 3982 is utilized. Charging is inhibited when the cell temperature deviates outside the preset window. The resistor values can be adjusted to provide the desired charging window for a variety of thermistors. Refer to the MCP73861/2/3/4 data sheet (DS21893) for details.

Note: Improper connection of the battery may result in damage to the battery

and increase the possibility of personal injury. It is also important to avoid shorting the battery terminals together.

–). In addition, a connection is provided for a nominal 10 kΩ at

BAT

2.3.5 Device Support Options

The MCP7386X Battery Charger Evaluation Board supports the entire MCP7386X family. The MCP7386X Battery Charger Evaluation Board is provided with one reference design utilizing the MCP73861. Alternate devices can be substituted in order to evaluate the different MCP7386X family options.

+). The battery pack negative terminal should be

BAT

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 MCP7386X Battery Charger Evaluation Board is provided with a Constant-Voltage mode output voltage of 4.2V per cell, the evaluation of which can be achieved by moving resistor R

to R3, or by shorting the R3 pads.

MCP7386X Evaluation Board User’s Guide

NOTES:

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

This appendix contains the following schematics and layouts for the MCP7386X Evaluation Board:

• Board Schematic

• Board – Top Layer

• Board – Silk Screen Layer

• Board – Bottom Layer

MCP7386X EVALUATION

BOARD USER’S GUIDE

MCP7386X Evaluation Board User’s Guide

A.2 BOARD SCHEMATIC

VBAT1

VDD1

VBAT+

4.7uF

VSS1

VBAT2

VBAT3

VDD23STAT1

STAT215VSET

VSS2

EXPAD

VSS3

TIMER

THERM

PROG

VBAT-

THREF

MCP73861/QFN(16)

THERM

DNP

6.19k

7.32k

PROG

GREEN

RED

100k

1.50k

4.7uF

VIN+

DNP

0.1uF

TIMER

VIN-

A.3 BOARD – TOP LAYER

Schematic and Layouts

MCP7386X Evaluation Board User’s Guide

A.4 BOARD – SILK SCREEN LAYER

A.5 BOARD – BOTTOM LAYER

Schematic and Layouts

MCP7386X Evaluation Board User’s Guide

NOTES:

MCP7386X EVALUATION

BOARD USER’S GUIDE

Appendix B. Bill Of Materials (BOM)

TABLE B-1: BILL OF MATERIALS (BOM)

Qty Designator Description Manufacturer Part Number

Opto/

ECJ-2FB1C475K

SML-LXT0805GW

SML-LXT0805SRW

5016

MCP73861-I/MLG

2 C1, C2 4.7 µF, X5R Ceramic, 16V, 0805 Panasonic

1 C3 0.1 µF, X7R Ceramic, 16V, 0805 Panasonic ECJ-2VB1C104K

1 D1 Green LED, 0805 Lumex

Components Inc.

1 D2 Red LED, 0805 Lumex Opto/

Components Inc.

8 J1 - J8 Surface-Mount Test Point, 5016 Keystone

Electronics

1R1 1.5kΩ, 1/8W, Chip Resistor, 0805 Panasonic ERJ-6GEYJ152V

1R2 0Ω Jumper, 0805 Panasonic ERJ-6GEY0R00V

0 R3, R5 DNP, 0805

2 R4, R8 100 kΩ, 1/10W, Chip Resistor, 0805 Panasonic ERJ-6ENF1003V

1R6 6.19kΩ, 1/10W, Chip Resistor, 0805 Panasonic ERJ-6ENF6191V

1R7 7.32kΩ, 1/10W, Chip Resistor, 0805 Panasonic ERJ-6ENF7321V

1 U1 Single-Cell Lithium-Ion Charger, 4X4QFN16 Microchip

Technology Inc.

Note 1: 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.

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07/21/06

Microchip Technology MCP7386X Battery Charger Evaluation Board User guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

INTRODUCTION

DOCUMENT LAYOUT

CONVENTIONS USED IN THIS GUIDE

RECOMMENDED READING

THE MICROCHIP WEB SITE

CUSTOMER SUPPORT

DOCUMENT REVISION HISTORY

Chapter 1. Product Overview

1.1 INTRODUCTION

1.2 WHAT IS THE MCP7386X BATTERY CHARGER EVALUATION BOARD?

1.3 WHAT THE MCP7386X BATTERY CHARGER EVALUATION BOARD INCLUDES

Chapter 2. Installation and Operation

2.1 FEATURES

2.2 GETTING STARTED

2.3 DETAILED DESCRIPTION

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

Appendix B. Bill Of Materials (BOM)

WORLDWIDE SALES AND SERVICE