MICROCHIP MCP73831 Technical data

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MCP73831

Evaluation Board

User’s Guide

Note the following details of the code protection feature on Microchip devices:

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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

MCP73831 EVALUATION

BOARD 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 ................................................................................................. 4

Document Revision History ................................................................................... 4

Chapter 1. Product Overview

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

1.2 What is the MCP73831 Evaluation Board? .................................................... 6

1.3 What the MCP73831 Evaluation 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

Appendix B. Bill Of Materials (BOM)

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

MCP73831 Evaluation Board User’s Guide

NOTES:

MCP73831 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 MCP73831 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 MCP73831 Evaluation Board. The manual layout is as follows:

• Chapter 1. “Product Overview” – Important information about the MCP73831

Evaluation Board.

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

started with this evaluation kit and a description of the evaluation boards.

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

diagrams for the MCP73831 Evaluation Board.

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

MCP73831 Evaluation Board.

MCP73831 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

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

N‘Rnnnn A number in verilog format,

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

where N is the total number of digits, R is the radix and n is a digit.

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”

4‘b0010, 2‘hF1

any valid filename

[options] errorlevel {0|1}

var_name...] void main (void)

{ ... }

IDE User’s Guide

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

Preface

MCP73831 Evaluation Board User’s Guide

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

DOCUMENT REVISION HISTORY

Revision A (December 2005)

• Initial Release of this Document.

Chapter 1. Product Overview

1.1 INTRODUCTION

The MCP73831 Evaluation Board is used to evaluate Microchip’s MCP73831 in simple, stand-alone Li-Ion battery charging applications. Two circuit boards are provided in the MCP73831 Evaluation Kit for evaluation of various device options.

This chapter covers the following topics:

• What is the MCP73831 Evaluation Board?

• What the MCP73831 Evaluation Kit Includes

MCP73831 EVALUATION

BOARD USER’S GUIDE

500 mA Li-Ion Battery Charger

1 μF

470Ω

STAT

MCP73831

BAT

PROG

FIGURE 1-1: Typical MCP73831 Application.

1 μF

2kΩ

Single Li-Ion Cell

MCP73831 Evaluation Board User’s Guide

1.2 WHAT IS THE MCP73831 EVALUATION BOARD?

The MCP73831 Evaluation Board is an evaluation and demonstration tool for Microchip’s MCP73831 miniature single-cell, fully-integrated Li-Ion, Li-Polymer charge-management controllers.

Two evaluation boards are provided in the MCP73831 Evaluation Kit. The boards are set up to evaluate simple, stand-alone, linear charging of single-cell Li-Ion / Li-Polymer battery packs (the battery packs are not included). Each board design provides constant current charging followed by constant voltage charging with automatic charge termination. In addition, the MCP73831-2AC board provides preconditioning of deeply depleted cells.

Each board design provides evaluation of the MCP73831 in two package options: a SOT23-5 and a 2 mm x 3 mm, 8-Lead DFN for higher power handling capability.

When connected, these evaluation boards allow for the evaluation of the MCP73831 devices in a variety of applications.

1.3 WHAT THE MCP73831 EVALUATION KIT INCLUDES

This MCP73831 Evaluation Kit includes:

• Two MCP73831 Evaluation Boards, 102-00085

• MCP73831 Evaluation Board User’s Guide, DS51596

• MCP73831 Data Sheet, “Miniature Single-Cell, Fully-Integrated Li-Ion, Li-Polymer Charge-Management Controller”, DS21984

• AN947, “Power Management in Portable Applications: Charging Lithium-Ion/Lithium-Polymer Batteries”, DS00947

• AN971, “USB Port-Powered Li-Ion/Li-Polymer Battery Charging”, DS00971

Chapter 2. Installation and Operation

2.1 INTRODUCTION

The MCP73831 Evaluation Board demonstrates Microchip’s MCP73831. The MCP73831 is a miniature single-cell, fully-integrated Li-Ion/Li-Polymer charge-management controller. A number of device options allow the MCP73831 to be utilized in a variety of applications. Refer to the MCP73831 data sheet (DS21984) for device options.

2.2 FEATURES

The MCP73831 Evaluation Kit contains two boards for evaluation of various device options. The boards have the following features with the factory installed devices:

• Charge Voltage: 4.20V

• Programmable Fast Charge Current up to 500 mA

• Preconditioning of deeply depleted cells (MCP73831-2AC)

- Preconditioning Threshold Voltage: 2.8V

- Preconditioning Current: 10% of Programmed Fast Charge Current

• No Preconditioning (MCP73831-2DC)

• Automatic Charge Termination

- Charge termination by minimum current in Constant Voltage Mode

- Termination Current: 7.5% of Programmed Fast Charge Current

• Automatic Recharge

- Recharge Threshold Voltage: 4.05V

• Charge Current Monitor for Fuel Gauging

• Thermal Regulation

• Reverse Discharge Protection

• Evaluation in SOT23-5 Package

• Evaluation in 2 mm x 3 mm, 8-Lead DFN package for higher power handling capability

• Simple Stand-Alone Operation

• Powered from external bench supply or voltage regulated wall cube

• Surface-Mount Design

• Fully Assembled and Tested

MCP73831 EVALUATION

BOARD USER’S GUIDE

MCP73831 Evaluation Board User’s Guide

2.3 GETTING STARTED

The MCP73831 Evaluation Boards are fully assembled and tested for charging single-cell, Li-Ion/Li-Polymer battery packs. The boards provide the appropriate charge algorithm for simple, stand-alone operation.

The boards require the use of an external input voltage source (5V ±10%, recommended) and external load (battery pack or simulated battery load).

2.3.1 Power Input and Output Connections

2.3.1.1 POWERING A MCP73831 EVALUATION BOARD

1. Apply the input voltage source to the appropriate circuit for evaluation. The input voltage source should be limited to the 0V to +6V range. For normal operation, the input voltage should be between +4.5V and +6V. The input voltage must not exceed an absolute maximum of +7V.

2. Connect the positive side of the input source (+) to V evaluated. Connect the negative or return side of the input source (-) to V the circuit being evaluated. Refer to Figure 2-1.

of the circuit being

Battery Pack or Simulated Battery Load

Input Power Supply

5.2V

FIGURE 2-1: Setup Configuration Diagram.

2.3.1.2 APPLYING THE LOAD TO A MCP73831 EVALUATION BOARD

1. To apply a load to a MCP73831 Evaluation Board, the positive side of the load (B+) should be connected to V return side of the load (B-) should be connected to V

of the circuit being evaluated. The negative or

BAT

of the circuit being eval-

uated. Care should be taken when using electronic loads or ground referenced loads.

2. For the MCP73831-2AC board, the charge management controller will only provide 10% of the programmed fast charge current if the battery terminal voltage (V

) is less than 2.8V with respect to VSS. Using a purely resistive load

BAT

will not work for preconditioning and fast charge currents. The best way to evaluate the charge management circuit is to use a single-cell Li-Ion battery pack, or the recommended simulated battery load. Refer to Figure 2-2.

Installation and Operation

B+

1,000 μF 10V Al

5Ω 2 W

B-

FIGURE 2-2: Simulated Battery Load.

2.3.1.3 SETTING THE FAST CHARGE CURRENT

1. As provided, the MCP73831 Evaluation Boards have two fast charge current set-

tings: 100 mA and 500 mA. The default fast charge current setting is 100 mA. By jumpering PROG to V

of the circuit being evaluated, the fast charge current is

set to 500 mA.

2. Alternatively, the appropriate programming resistor can be changed in the hard-

ware to obtain the desired fast charge current setting. Resistor R3 should be changed for the SOT23 circuit, and resistor R8 should be changed for the DFN circuit. Refer to the MCP73831 data sheet for choosing the appropriate value programming resistor for the desired fast charge current.

Variable Power Supply 0V - 6V

2.3.1.4 STATUS INDICATORS

1. The MCP73831 Evaluation Boards have two LED status indicators for each

circuit being evaluated. Table 2-1 represents the state of the status indicators during various states of the charge cycle. ON indicates that the respective LED is illuminated.

TABLE 2-1: STATUS INDICATORS

Charge Cycle State Red LED Green LED

Qualification ON ON Preconditioning ON OFF Constant Current Fast Charge ON OFF Constant Voltage ON OFF Charge Complete OFF ON Battery Disconnected ON ON Input Voltage Source Removed OFF OFF Input Voltage Source Below UVLO ON ON Shutdown ON ON

2.3.1.5 CHARGE CURRENT MONITOR

1. The MCP73831 Evaluation Boards have a charge current monitor for each circuit

being evaluated. The charge current monitor can be used as a coulomb counter for fuel gauging. The charge current is equivalent to the voltage at CHARGE MONITOR with respect to V

divided by the value of the programming resistor

in kilo-ohms. For example, the default programming resistor is 10 kΩ. If the measured voltage at CHARGE MONITOR is 1V, the charge current is equal to 1 divided 10, or 100 mA. If the measured voltage at CHARGE MONITOR is 100 mV, the charge current is 0.1 divided by 10, or 10 mA.

MCP73831 Evaluation Board User’s Guide

2.3.1.6 DEVICE SUPPORT OPTIONS

1. The MCP73831 Evaluation Boards are capable of supporting all of the available MCP73831 device options. The factory installed devices are the MCP73831-2AC and the MCP73831-2DC. Refer to the MCP73831 data sheet for available device options and details regarding the installed device options.

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

This appendix contains the following schematic and layouts for the MCP73831 Evaluation Boards.

Diagrams included in this appendix:

• Board Schematic

• Board - Assembly Drawing

• Board - Top Overlay

• Board - Top Layer

• Board - Bottom Layer

MCP73831 EVALUATION

BOARD USER’S GUIDE

MCP73831 Evaluation Board User’s Guide

A K

FIGURE A-1: Board Schematic.

Schematic and Layouts

TP6

TP5

TP10

TP11

TP12

TP1

TP2

D3 R10

C4 D4

TP7

TP8

TP3 TP4

FIGURE A-2: Board - Assembly Drawing.

TP9

MCP73831 Evaluation Board User’s Guide

TP1

R1D1D2

TP2

TP3 TP4

TP7

TP8

TP9

C4 D4

D3 R10

TP6

TP5

TP10

TP11

TP12

FIGURE A-3: Board - Top Overlay.

Schematic and Layouts

FIGURE A-4: Board - Top Layer.

MCP73831 Evaluation Board User’s Guide

FIGURE A-5: Board - Bottom Layer.

MCP73831 EVALUATION

BOARD USER’S GUIDE

Appendix B. Bill Of Materials (BOM)

TABLE B-1: BILL OF MATERIALS (BOM)

Qty. Reference Description Mfgr. Part Number

4 C1,C2,C5,C6 4.7uF, X5R Ceramic, 10V, 0805 Panasonic 2 C3,C4 0.1uF, X7R Ceramic, 16V, 0603 Panasonic-ECG ECJ-1VB1C104K 2 D1,D4 Super Red LED, 0603 Lumex LTST-C190KRKT 2 D2,D3 Green LED, 0603 Lumex LTST-C190KGKT 4 R1,R2,R9,R10 221, 1/10W, Chip Resistor, 0603 Panasonic-ECG ERJ-3EK2210V 2 R3,R8 10.0k, 1/10W, Chip Resistor, 0603 Panasonic-ECG ERJ-3EK1002V 2 R4,R7 2.49k, 1/10W, Chip Resistor, 0603 Panasonic-ECG ERJ-3EK2491V 2 R5,R6 100k, 1/10W, Chip Resistor, 0603 Panasonic-ECG ERJ-3EK1003V 12 TP1-TP12 Surface Mount Test Point, 5016 Keystone 5016 1 U1 Miniature Li-Ion Charger, SOT23-5 Microchip

Technology Inc.

1 U2 Miniature Li-Ion Charger, 2X3DFN8 Microchip

Technology Inc. 4 Bump-ons 3M SJ5003 1 Printed Circuit Board Advanced Circuits 104-00085-R1 Note 1: Installed device option is indicated on board.

-ECG ECJ-GVB1A475M

MCP73831-2ACI/OT MCP73831-2DCI/OT

MCP73831-2ACI/MC MCP73831-2DCI/MC

(1)

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10/31/05

MICROCHIP MCP73831 Technical data

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 MCP73831 EVALUATION BOARD?

1.3 WHAT THE MCP73831 EVALUATION KIT INCLUDES

Chapter 2. Installation and Operation

2.1 INTRODUCTION

2.2 FEATURES

2.3 GETTING STARTED

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

Appendix B. Bill Of Materials (BOM)

WORLDWIDE SALES AND SERVICE