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

Page 14

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

Page 13 Page 15
Image 14
Page 13 Page 15
Contents LED Lighting Control Using the MC9S08AW60 Page Designer Reference Manual LED Lighting Control using the MC9S08AW60Revision History Freescale Semiconductor Table of Contents Appendix a Schematics Appendix B Bill of Materials Introduction FeaturesChapter Introduction Devices in the MC9S08AW60/48/32/16 Series System OverviewMC9S08AW60 Peripherals Available per Package Type Introduction LED Lighting Control using the MC9S08AW60, Rev Chapter Hardware Description AW60 Control BoardDEMO9S08AW60LED Features DEMO9S08AW60LED LayoutDevelopment Support PowerReset Switch Clock SourceUser Options Pushbutton SwitchesLED Indicators ADC InterfaceSCI Port Other I/O ConnectorsIIC Port SPI Port10. Sensor Interface Type a PWM PortLED Light Box Interface 13. User Assignable Input 12. Temperature Sensor Input11. Sensor Interface Type H LED Driving Board LED Driver Design Procedures RGB LED ChipCurrent Sense Resistor Boost ConverterEquations for Boost Converter Freescale Semiconductor Chapter Firmware Description Firmware Flow Main ProgramPC Control Mode Firmware Flow PWM AdjustmentUser Interface Menu Standalone Mode Firmware Files Freescale Semiconductor Hardware Setup Chapter Demo SetupHardware and Software Setup PC Software SetupEcho Typed Characters Setting Demo Examples Demo 1 Demonstration DisplayDemo 4 PWM Output Frequency Control Demo 2 Preset Colors DisplayDemo 3 Auto White Balance Control Demo 5 Full Manual ControlTroubleshooting Program the MCU FlashDemo Setup Appendix a Schematics LED Lighting Control using the MC9S08AW60, Rev LED Lighting Control using the MC9S08AW60, Rev LED Lighting Control using the MC9S08AW60, Rev LED Lighting Control using the MC9S08AW60, Rev LED Lighting Control using the MC9S08AW60, Rev Appendix B Bill of Materials BOM for AW60 Control Board Part Description Quantity Value DesignatorsBOM for LED Driving Board Value DesignatorsLED Lighting Control using the MC9S08AW60, Rev Page How to Reach Us
Top Page Image Contents