Atmel QTouch Library User Guide
Atmel QTouch Library User Guide Atmel QTouch Library User Guide
Recommended setting.Table 19 QTouch Library for ATtiny20 Memory requirementsData memory for ATtiny20 QTouch Library include the following.10. QTouch Library data memory – 19 bytes, allocated inside the Library.11. channel_signals – 2 bytes per Sensor, allocated in main.c12. channel_references – 2 bytes per Sensor, allocated in main.c13. sensor_delta – 2 bytes per Sensor, allocated in main.c14. sensor_general_counter – 2 bytes per Sensor, allocated in main.c15. sensor_state – 1 byte per Sensor, allocated in main.c16. sensor_ndil_counter – 1 byte per Sensor, allocated in main.c17. sensor_states – 1 byte, allocated in main.cConst Data memory for ATtiny20 QTouch Library include the following.1. sensor_threshold, 1 byte per Sensor, allocated in main.c2. sensor_hyst_threshold, 1 byte per Sensor, allocated in main.c3. sensor_recal_threshold, 1 byte per Sensor, allocated in main.cQTouch Library for ATtiny40 deviceATMEL QTouch Library for ATtiny40 can be used for embedding capacitive touch buttonsfunctionality into ATtiny40 device application.This Section describes the QTouch Library Application Programming API and Configurationinterface for QTouch method acquisition using the ATtiny40 devices.Salient Features of QTouch Library for ATtiny40QTouch method sensor• One Physical pin per Touch Button.• 1 to 12 Touch Buttons can be configured.• Individual Sensor Threshold, Sensor Hysteresis and Sensor Global acquisitionparameters can be configured.• Signal resolution can be configured.• Charge Share Delay can be configured.• Adjacent Key Supression (AKS) support.• QTouch Studio support for Touch data analysis.• ‘C’ Programming interface for easy inclusion of User application.1748207K-AT42-09/11
Compiler tool chain support for ATtiny40The QTouch libraries for ATtiny40 devices are supported for the following compiler tool chains.ToolIAR Embedded Workbench for Atmel AVR.IAR Compiler.Version5.51Table 20 Compiler tool chains support for ATtiny40 QTouch LibraryOverview of QTouch Library for ATtiny40For an overview of QTouch method based capacitive touch acquisition, refer Section 5.2.1QTouch Acquistion method.The QTouch Library for ATtiny40 device allows for Sensor configuration and Sensor Acquisitionparameter setting. Based on the input Sensor configuration, the QTouch Library takes care of thecapacitive touch acquisition data capture operations on the external capacitive touch sensors.The captured Touch Data and Touch Button ON/OFF Status information is then available for userapplication.The diagram below indicates a Typical Sensor arrangement using the Tiny40 device. For onechannel configuration, two ADC pins are used for acquisition. For number of touch buttonsgreater than one, no extra ADC pins are used. Port pins PA0 to PA7 and PB0 to PB3 can beused to support upto 12 Touch Buttons. The Touch Buttons may be connected anywhere on thesaid port pins.The Sensor numbering is always in the increasing order of Port pin.VCCGNDATtiny40PA0PA1PA2PA3PA4PA5PA6PA7PB0PB1PB2PB31Kohm1Kohm1Kohm1Kohm1Kohm1Kohm1Kohm1Kohm1Kohm1Kohm1Kohm1KohmTouch Button 0Touch Button 1Touch Button 2Touch Button 3Touch Button 4Touch Button 5Touch Button 6Touch Button 7Touch Button 8Touch Button 9Touch Button 10Touch Button 11175
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Recommended setting.Table 19 <strong>QTouch</strong> <strong>Library</strong> for ATtiny20 Memory requirementsData memory for ATtiny20 <strong>QTouch</strong> <strong>Library</strong> include the following.10. <strong>QTouch</strong> <strong>Library</strong> data memory – 19 bytes, allocated inside the <strong>Library</strong>.11. channel_signals – 2 bytes per Sensor, allocated in main.c12. channel_references – 2 bytes per Sensor, allocated in main.c13. sensor_delta – 2 bytes per Sensor, allocated in main.c14. sensor_general_counter – 2 bytes per Sensor, allocated in main.c15. sensor_state – 1 byte per Sensor, allocated in main.c16. sensor_ndil_counter – 1 byte per Sensor, allocated in main.c17. sensor_states – 1 byte, allocated in main.cConst Data memory for ATtiny20 <strong>QTouch</strong> <strong>Library</strong> include the following.1. sensor_threshold, 1 byte per Sensor, allocated in main.c2. sensor_hyst_threshold, 1 byte per Sensor, allocated in main.c3. sensor_recal_threshold, 1 byte per Sensor, allocated in main.c<strong>QTouch</strong> <strong>Library</strong> for ATtiny40 deviceATMEL <strong>QTouch</strong> <strong>Library</strong> for ATtiny40 can be used for embedding capacitive touch buttonsfunctionality into ATtiny40 device application.This Section describes the <strong>QTouch</strong> <strong>Library</strong> Application Programming API and Configurationinterface for <strong>QTouch</strong> method acquisition using the ATtiny40 devices.Salient Features of <strong>QTouch</strong> <strong>Library</strong> for ATtiny40<strong>QTouch</strong> method sensor• One Physical pin per Touch Button.• 1 to 12 Touch Buttons can be configured.• Individual Sensor Threshold, Sensor Hysteresis and Sensor Global acquisitionparameters can be configured.• Signal resolution can be configured.• Charge Share Delay can be configured.• Adjacent Key Supression (AKS) support.• <strong>QTouch</strong> Studio support for Touch data analysis.• ‘C’ Programming interface for easy inclusion of <strong>User</strong> application.1748207K-AT42-09/11
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