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Freescale Semiconductor S08 manual LED Driving Board, 13. User Assignable Input Continued

Models: S08

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Table 2-13. User Assignable Input (Continued)

Hardware Description

Table 2-13. User Assignable Input (Continued)

CON13	Signal Name	Remarks

Pin 7	DCDC_CTL1	Connected to MCU PTF4/TPM2CH0

Pin 8	DCDC_CTL2	Connected to MCU PTF5/TPM2CH1

Pin 9	DCDC_CTL3	Connected to MCU PTE3/TPM1CH1

Pin 10	GND	—

2.10 LED Driving Board

In general, LEDs have a nonlinear I-V behavior and current limitation is required to prevent the power dissipation to exceed a maximum limit. Therefore, the ideal source for LED driving is a constant current source. A linear type LED driver is used in this reference design and the block diagram is shown in Figure 2-4. The major advantage of linear driver is fast turn ON and OFF response times to support high frequency PWM dimming method and wide range control on dimming level. An integrated DC-to-DC boost converter (MC34063) generates the high voltage required for LED driving in series and is shared with RGB channels, but the drawback is the power loss on R channel is higher than G or B channels. Individual DC-to-DC block should be used for each channel in power sensitive applications.

LED Lighting Control using the MC9S08AW60, Rev. 1

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Freescale Semiconductor S08 manual LED Driving Board, 13. User Assignable Input Continued

Contents

S08 Microcontrollers LED Lighting Control Using the MC9S08AW60Designer Reference Manual freescale.comPage LED Lighting Control using the MC9S08AW60 Revision HistoryDesigner Reference Manual Revision History LED Lighting Control using the MC9S08AW60, Rev Freescale SemiconductorChapter Table of ContentsDemo Setup IntroductionAppendix A Schematics Appendix B Bill of Materials 1.2 Features Chapter Introduction1.1 Introduction Figure 1-1 . System Block Diagram 1.3 System Overview1.4 MC9S08AW60 Table 1-1. Devices in the MC9S08AW60/48/32/16 SeriesTable 1-2. Peripherals Available per Package Type FeatureLED Lighting Control using the MC9S08AW60, Rev MC9S08AW60Introduction LED Lighting Control using the MC9S08AW60, Rev Freescale SemiconductorAW60 Control Board Chapter Hardware Description2.1 Introduction Figure 2-1. Light-Box Demo2.2 DEMO9S08AW60LED Features 2.3 DEMO9S08AW60LED LayoutFigure 2-2. DEMO9S08AW60LED Top Side 2.4 Development Support 2.5 Power2.6 Reset Switch 2.7 Clock Source2.9 User Options 2.9.1 Pushbutton Switches2.9.2 LED Indicators 2.9.3 ADC InterfaceTable 2-6. SCI Port 2.9.4 Other I/O ConnectorsTable 2-5. IIC Port Table 2-7. SPI PortTable 2-8. PWM Port Table 2-9. LED Light Box InterfaceTable 2-10. Sensor Interface Type A Table 2-12. Temperature Sensor Input Table 2-11. Sensor Interface Type HTable 2-13. User Assignable Input 2.10 LED Driving Board Table 2-13. User Assignable Input Continued2.11 LED Driver Design Procedures 2.11.1 RGB LED ChipFigure 2-3. DC-to-DC Boost Converter and Linear LED Driver 2.11.2 Current Sense Resistor 2.11.3 Boost ConverterFigure 2-4. Equations for Boost Converter Hardware Description LED Lighting Control using the MC9S08AW60, Rev Freescale SemiconductorChapter Firmware Description 3.1 IntroductionFigure 3-1. Firmware Flow Main Program 3.2 PC Control Mode Figure 3-2. Firmware Flow PWM AdjustmentFigure 3-3. User Interface Menu 3.3 Standalone Mode Menu.c 3.4 Firmware FilesMain.c SCI.cFirmware Description LED Lighting Control using the MC9S08AW60, Rev Freescale Semiconductor4.2.1 Hardware Setup Chapter Demo Setup4.2 Hardware and Software Setup 4.2.2 PC Software SetupFigure 4-1. Echo Typed Characters Setting Demo SetupLED Lighting Control using the MC9S08AW60, Rev 4.3 Demo Examples 4.3.1 Demo 1 - Demonstration DisplayFigure 4-2. LED Control Menu 4.3.4 Demo 4 - PWM Output Frequency Control 4.3.2 Demo 2 - Preset Colors Display4.3.3 Demo 3 - Auto White Balance Control 4.3.5 Demo 5 - Full Manual Control4.5 Troubleshooting 4.4 Program the MCU FlashRepeat the PC software setup procedures again Appendix A Schematics LED Lighting Control using the MC9S08AW60, RevLED Lighting Control using the MC9S08AW60, Rev Freescale SemiconductorLED Lighting Control using the MC9S08AW60, Rev Freescale SemiconductorLED Lighting Control using the MC9S08AW60, Rev Freescale SemiconductorLED Lighting Control using the MC9S08AW60, Rev Freescale SemiconductorLED Lighting Control using the MC9S08AW60, Rev Freescale SemiconductorAppendix B Bill of Materials LED Lighting Control using the MC9S08AW60, RevPart Description LED Lighting Control using the MC9S08AW60, RevTable 4-1 BOM for AW60 Control Board QuantityValue Table 4-2 BOM for LED Driving BoardPart Description DesignatorsLED Lighting Control using the MC9S08AW60, Rev Freescale SemiconductorPage E-mail How to Reach UsHome Page USA/Europe or Locations Not Listed