Microchip Technology MCP1252 Manual de usuario

MCP1252 Charge Pump

Backlight LED Demo Board

User’s Guide

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MCP1252 CHARGE PUMP BACKLIGHT

LED DEMO BOARD USER’S GUIDE

Table of Contents

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

Chapter 1. Product Overview........................................................................................5

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

1.2 What is the MCP1252 Charge Pump Backlight LED Demo Board? ...............6

1.3 What the MCP1252 Charge Pump Backlight LED Demo Board kit includes .6

Chapter 2. Installation and Operation ..........................................................................7

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

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

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

Appendix A. Schematic and Layouts.........................................................................11

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

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

A.3 Board – Top Assembly Drawing .................................................................13

A.4 Board – Top Layer + Silk-Screen .............................................................14

A.5 Board – Bottom Layer (From Top) .............................................................15

Appendix B. Bill-Of-Materials (BOM)..........................................................................17

Appendix C. 00016R1.asm Source Code ...................................................................19

C.1 Device Firmware ......................................................................................19

Worldwide Sales and Service ....................................................................................26

MCP1252 Charge Pump Backlight LED Demo Board User’s Guide

NOTES:

MCP1252 CHARGE PUMP BACKLIGHT

LED DEMO BOARD USER’S GUIDE

Preface

INTRODUCTION

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

MCP1252 Charge Pump Backlight LED Demo 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 touse the MCP1252 Charge Pump Backlight LED Demo

Board. The manual layout is as follows:

•Chapter 1. “Product Overview” – Important information about the MCP1252

Charge Pump Backlight LED Demo 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 MCP1252 Charge Pump Backlight LED Demo Board.

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

MCP1252 Charge Pump Backlight LED Demo Board.

•Appendix C. “00016R1.asm Source Code” – Provides information about the

application firmware and where the source code can be found.

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.

MCP1252 Charge Pump Backlight LED Demo 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 MCP1252 Charge Pump Backlight LED Demo

Board. The following Microchip documents are available and recommended as

supplemental reference resources.

MCP1252/3 Data Sheet, “Low Noise, Positive Regulated Charge Pump”,

(DS21752)

This data sheet provides detailed information regarding the MCP1252/3 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

‘bnnnn A binary number where nis a

digit ‘b00100, ‘b10

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

Courier font:

Plain Courier 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

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

any valid filename

0xnnnn A hexadecimal number where

nis a hexadecimal digit 0xFFFF, 0x007A

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

• 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

In addition, there is a Development Systems Information Line which lists the latest

versions of Microchip's development systems software products. This line also pro-

vides information on how customers can receive currently available upgrade kits.

The Development Systems Information Line numbers are:

1-800-755-2345 – United States and most of Canada

1-480-792-7302 – Other International Locations

DOCUMENT REVISION HISTORY

Revision A (May 2005)

• Initial Release of this Document.

MCP1252 Charge Pump Backlight LED Demo Board User’s Guide

NOTES:

MCP1252 CHARGE PUMP BACKLIGHT

LED DEMO BOARD USER’S GUIDE

Chapter 1. Product Overview

1.1 INTRODUCTION

Today’s new color displays require a pure white light for backlighting. White

light-emmitting diodes have become the component of choice. The MCP1252-ADJ is

an excellent choice for biasing the backlighting or driving other LED applications. Light

intensity is controlled uniformly through the use of ballast resistors. The peak intensity

is set by the feedback (FB) to the the MCP1252-ADJ. Dimming is accomplished by

pulse-width modulating the shutdown pin of the device.

This chapter covers the following topics:

• What is the MCP1252 Charge Pump Backlight LED Demo Board?

• What the MCP1252 Charge Pump Backlight LED Demo Board Kit Includes

FIGURE 1-1: MCP1252 Charge Pump Backlight LED Demo Board Block

Diagram.

PIC10F206

MCP1252

3 AAA

Battery

Pack

Power

Supply

VOUT

SHDN

Push Button

MCP1252 Charge Pump Backlight LED Demo Board User’s Guide

1.2 WHAT IS THE MCP1252 CHARGE PUMP BACKLIGHT LED DEMO BOARD?

The MCP1252 Charge Pump Backlight LED Demo Board demonstrates the use of a

charge pump device in a LED application. The board also serves as a platform to

evaluate the MCP1252 device generally.

The MCP1252-ADJ deviceused in this application is an inductorless, positive-regulated

charge pump DC/DC converter. The device generates an adjustable output voltage. It

is specifically designed for applications requiring low noise and high efficiency, and is

able to deliver up to 120 mA output current. In addition, a charge pump is a low-cost,

compactand simplesolution for anapplication,as it onlyrequires one externalcapacitor

to transfer charge from the input supply to the regulated output.

The MCP1252 allows the input voltage to be lower or higher than the the output voltage

by automatically switching between buck and boost operation. This makes it especially

suited for battery applications, allowing the system voltage to be maintained even after

the batteries have discharged below the system voltage level, further extending the

overall charge life of the battery.

1.3 WHAT THE MCP1252 CHARGE PUMP BACKLIGHT LED DEMO BOARD KIT

INCLUDES

This MCP1252 Charge Pump Backlight LED Demo Board kit includes:

• MCP1252 Charge Pump Backlight LED Demo Board (102-00016)

• MCP1252 Charge Pump Backlight LED Demo Board User’s Guide (DS51551)

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