Microchip Technology MCP1252 User Manual

MCP1252 Charge Pump

Backlight LED Demo Board

User’s Guide

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8-bit MCUs, KEELOQ

code hopping

MCP1252 CHARGE PUMP BACKLIGHT

LED DEMO BOARD USER’S GUIDE

Tabl e of Conten ts

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 St a rt ed ...... .............. .. .. ............. .. .............. .. ............. .. ... ............. .. ....... 8

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

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

A.2 Board – Sc h em a tic ............ ............. .. ............. ... ............. .. ............. ... .. ....... 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 Fir m wa re .. .. ............. .. ............. ... ............. .. .. .............. .. ............. .. ... 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

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 Select the Help menu, and then Topics to open a list of available on-line help files.

IDE on-line help.

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 to use 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 sou rce co de can be found.

MCP1252 Charge Pump Backlight LED Demo Board User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following docum entat io n conven tion s:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic characters Referenced books MPLAB

Emphasized text ...is the only comp ile r...

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

‘bnnnn A binary number where n is a

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

Courier font:

Plain Courier Sample source code #define START

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

0xnnnn A hexadecimal number wher e

Square brackets [ ] Optional arguments mcc18 [options] file

Curly brackets and pipe character: { | }

Ellipses... Replaces r epeated text var_name [,

A menu path File>Save

A tab Click the Power tab

digit

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

n is a hexadecimal digit

Choice of mutually exclusive arguments; an OR selection

Represents code supplied by user

“Save project before build”

‘b00100, ‘b10

any valid filename

0xFFFF, 0x007A

[options] errorlevel {0|1}

var_name...] void main (void)

{ ... }

IDE 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

MCP1252 CHARGE PUMP BACKLIGHT

LED DEMO BOARD USER’S GUIDE

3 AAA

Battery

Pack

Power

Supply

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

PIC10F206

SHDN

MCP1252

Push Button

OUT

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 device used in this application is an in ductorless, positive-regulated charge pump DC/DC converter . The device generates an adjustable output volt age. 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, compact and simple solution for an application, as it o nly requires one external capacitor 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 DEM O 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)

+ 21 hidden pages

Microchip Technology MCP1252 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

Chapter 1. Product Overview

1.1 INTRODUCTION

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

1.3 WHAT THE MCP1252 CHARGE PUMP BACKLIGHT LED DEM O BOARD KIT INCLUDES