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Freescale Semiconductor S08 manual Chapter Introduction, Features

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Chapter 1

Chapter 1

Introduction

1.1 Introduction

This manual describes a reference design of a multi-color LED lighting control solution by using the MC9S08AW60 Microcontroller.

Using a microcontroller (MCU) to control the red/green/blue (RGB) color LEDs increases system flexibility and functionality for the next generation of lighting applications, architectural/entertainment lighting or LCD backlighting, that require a smart and adaptive control methodology to ensure optimized color space rendering for various display contents, excellent color contrast for realistic display scene and a consistent color setting in manufacturing. In many cases, these new applications are controlled by a central control unit that requires a connectivity interface that can be implemented at a low cost using MCU-based lighting controller.

A compact light-box with more than a million display colors is implemented to demonstrate the advantages of using MCU to control RGB color LEDs with different luminosity settings. The average current through each color LED is controlled by an individual PWM signal generated from MCU and the LED luminosity is almost in linear relationship with the pulse width of the driving PWM signal. The final display color is determined on the mix of light emitted by RGB LEDs, so one of the simple methods to set the light source in different color is changing the RGB PWM duty cycles equal to the corresponding mixing ratio required for a particular color. In addition, a serial control protocol with user interface is also developed as a communication link to control and monitor system parameters through a personal computer.

All hardware schematic diagrams and firmware source codes are available as reference materials.

1.2 Features

•Apply for architectural/entertainment lighting or LCD backlighting applications

•Exceptional color mixing

•Pre-set or dynamic RGB colors

•High resolution on dimming control

•Automatic white balance tracking on dimming

•Flexible connectivity interface

•User friendly control menu

LED Lighting Control using the MC9S08AW60, Rev. 1

Freescale Semiconductor

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Freescale Semiconductor S08 manual Chapter Introduction, Features

Contents

freescale.com LED Lighting Control Using the MC9S08AW60Designer Reference Manual S08 MicrocontrollersPage Revision History LED Lighting Control using the MC9S08AW60Designer Reference Manual Freescale Semiconductor Revision History LED Lighting Control using the MC9S08AW60, RevIntroduction Table of ContentsDemo Setup ChapterAppendix A Schematics Appendix B Bill of Materials Chapter Introduction 1.2 Features1.1 Introduction Table 1-1. Devices in the MC9S08AW60/48/32/16 Series 1.3 System Overview1.4 MC9S08AW60 Figure 1-1 . System Block DiagramMC9S08AW60 FeatureLED Lighting Control using the MC9S08AW60, Rev Table 1-2. Peripherals Available per Package TypeFreescale Semiconductor Introduction LED Lighting Control using the MC9S08AW60, RevFigure 2-1. Light-Box Demo Chapter Hardware Description2.1 Introduction AW60 Control Board2.3 DEMO9S08AW60LED Layout 2.2 DEMO9S08AW60LED FeaturesFigure 2-2. DEMO9S08AW60LED Top Side 2.7 Clock Source 2.5 Power2.6 Reset Switch 2.4 Development Support2.9.3 ADC Interface 2.9.1 Pushbutton Switches2.9.2 LED Indicators 2.9 User OptionsTable 2-7. SPI Port 2.9.4 Other I/O ConnectorsTable 2-5. IIC Port Table 2-6. SCI PortTable 2-9. LED Light Box Interface Table 2-8. PWM PortTable 2-10. Sensor Interface Type A Table 2-11. Sensor Interface Type H Table 2-12. Temperature Sensor InputTable 2-13. User Assignable Input Table 2-13. User Assignable Input Continued 2.10 LED Driving Board2.11.1 RGB LED Chip 2.11 LED Driver Design ProceduresFigure 2-3. DC-to-DC Boost Converter and Linear LED Driver 2.11.3 Boost Converter 2.11.2 Current Sense ResistorFigure 2-4. Equations for Boost Converter Freescale Semiconductor Hardware Description LED Lighting Control using the MC9S08AW60, Rev3.1 Introduction Chapter Firmware DescriptionFigure 3-1. Firmware Flow Main Program Figure 3-2. Firmware Flow PWM Adjustment 3.2 PC Control ModeFigure 3-3. User Interface Menu 3.3 Standalone Mode SCI.c 3.4 Firmware FilesMain.c Menu.cFreescale Semiconductor Firmware Description LED Lighting Control using the MC9S08AW60, Rev4.2.2 PC Software Setup Chapter Demo Setup4.2 Hardware and Software Setup 4.2.1 Hardware SetupDemo Setup Figure 4-1. Echo Typed Characters SettingLED Lighting Control using the MC9S08AW60, Rev 4.3.1 Demo 1 - Demonstration Display 4.3 Demo ExamplesFigure 4-2. LED Control Menu 4.3.5 Demo 5 - Full Manual Control 4.3.2 Demo 2 - Preset Colors Display4.3.3 Demo 3 - Auto White Balance Control 4.3.4 Demo 4 - PWM Output Frequency Control4.4 Program the MCU Flash 4.5 TroubleshootingRepeat the PC software setup procedures again LED Lighting Control using the MC9S08AW60, Rev Appendix A SchematicsFreescale Semiconductor LED Lighting Control using the MC9S08AW60, RevFreescale Semiconductor LED Lighting Control using the MC9S08AW60, RevFreescale Semiconductor LED Lighting Control using the MC9S08AW60, RevFreescale Semiconductor LED Lighting Control using the MC9S08AW60, RevFreescale Semiconductor LED Lighting Control using the MC9S08AW60, RevLED Lighting Control using the MC9S08AW60, Rev Appendix B Bill of MaterialsQuantity LED Lighting Control using the MC9S08AW60, RevTable 4-1 BOM for AW60 Control Board Part DescriptionDesignators Table 4-2 BOM for LED Driving BoardPart Description ValueFreescale Semiconductor LED Lighting Control using the MC9S08AW60, RevPage USA/Europe or Locations Not Listed How to Reach UsHome Page E-mail