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Freescale Semiconductor S08 User Options, Pushbutton Switches, LED Indicators, ADC Interface

Models: S08

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2.9 User Options

Hardware Description

2.9 User Options

The DEMO9S08AW60LED includes various input and output devices to assist in application development. These devices include four pushbutton switches, four LEDs, and an operational amplifier with RC filter connected at each ADC input channel for signal amplification and filtering.

2.9.1 Pushbutton Switches

Four pushbutton switches provide momentary active low input for user applications. The table below describes the pushbutton switch connections.

Table 2-3. Pushbutton Switches (SW1-SW4) Connections

Switch	MCU Port

SW1	PTG0/KBI0

SW2	PTG1/KBI1

SW3	PTG2/KBI2

SW4	PTG3/KBI3

2.9.2 LED Indicators

Four green LED indicators (D1-D4) are provided to assist during code development. The LEDs are active low and illuminated when a logic low signal is driven from the MCU port pin. Two of the LEDs are connected to port A, and the other two are connected to Port C. The connections are described below:

Table 2-4. LEDs (D1-D4) Connections

LED	MCU Port

D1	PTA0

D2	PTA1

D3	PTC2

D4	PTC4

2.9.3 ADC Interface

Eight operational amplifiers are provided to assist users in developing applications with feedback control signals. For examples, the signal generated by an optical sensor in LED backlight system should be scaled to a level matched with the ADC input range without any saturation. Each operational amplifier can be configured as an inverting or non-inverting amplifier with variable gain setting by different resistor connections. A RC filter is also connected at each output for noise filtering.

NOTE

The maximum operational amplifier output voltage should be limited to the

VDD voltage applied to MCU to prevent any damage on input port.

LED Lighting Control using the MC9S08AW60, Rev. 1

14	Freescale Semiconductor

Image 14

Freescale Semiconductor S08 User Options, Pushbutton Switches, LED Indicators, ADC Interface, 4. LEDs D1-D4 Connections

Contents

S08 Microcontrollers LED Lighting Control Using the MC9S08AW60Designer Reference Manual freescale.comPage Designer Reference Manual LED Lighting Control using the MC9S08AW60Revision History Revision History LED Lighting Control using the MC9S08AW60, Rev Freescale SemiconductorChapter Table of ContentsDemo Setup IntroductionAppendix A Schematics Appendix B Bill of Materials 1.1 Introduction 1.2 FeaturesChapter 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 DemoFigure 2-2. DEMO9S08AW60LED Top Side 2.2 DEMO9S08AW60LED Features2.3 DEMO9S08AW60LED Layout 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 2-10. Sensor Interface Type A Table 2-8. PWM PortTable 2-9. LED Light Box Interface Table 2-13. User Assignable Input Table 2-12. Temperature Sensor InputTable 2-11. Sensor Interface Type H 2.10 LED Driving Board Table 2-13. User Assignable Input ContinuedFigure 2-3. DC-to-DC Boost Converter and Linear LED Driver 2.11 LED Driver Design Procedures2.11.1 RGB LED Chip 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 SemiconductorFigure 3-1. Firmware Flow Main Program Chapter Firmware Description3.1 Introduction 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 SetupLED Lighting Control using the MC9S08AW60, Rev Figure 4-1. Echo Typed Characters SettingDemo Setup Figure 4-2. LED Control Menu 4.3 Demo Examples4.3.1 Demo 1 - Demonstration Display 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