ID 413C: Can Touch This:

Designing Capacitive-Based Touch Solutions

Mark F Rodriguez

Senior Engineering

13 October 2010

Version: 1.0

Xaplos Inc.

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Mr. Mark F Rodriguez

Senior Engineer @ Xaplos, Inc. Technology consultant with over 12 years of design experience.

Responsible for the successful release of over 20 commercial products

Special interest in medical device industry and home-based healthcare systems

BSBE/MSBE from the University of Miami

RECENT HMI RELATED PROJECTS:

Handheld aftermarket automotive tuning unit

Wearable life-sustaining medical device

Educational tablet device for elementary students

Reference design for Arrow Electronics

Marine power distribution system

Renesas Technology and Solution Portfolio

Microcontrollers& Microprocessors

#1 Market shareworldwide *

Analog andPower Devices#1 Market share

in low-voltageMOSFET**

Solutionsfor

Innovation

Solutionsfor

InnovationASIC, ASSP& Memory

Advanced and proven technologies * MCU: 31% revenue

basis from Gartner "Semiconductor Applications Worldwide Annual Market Share: Database" 25 March 2010

** Power MOSFET: 17.1% on unit basis from Marketing Eye 2009 (17.1% on unit basis).

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Renesas Technology and Solution Portfolio

Microcontrollers& Microprocessors

#1 Market shareworldwide *

Analog andPower Devices#1 Market share

in low-voltageMOSFET**

ASIC, ASSP& Memory

Advanced and proven technologies * MCU: 31% revenue

basis from Gartner "Semiconductor Applications Worldwide Annual Market Share: Database" 25 March 2010

** Power MOSFET: 17.1% on unit basis from Marketing Eye 2009 (17.1% on unit basis).

Solutionsfor

Innovation

Solutionsfor

Innovation

5

Microcontroller and Microprocessor Line-up

Superscalar, MMU, Multimedia Up to 1200 DMIPS, 45, 65 & 90nm process Video and audio processing on Linux Server, Industrial & Automotive

Up to 500 DMIPS, 150 & 90nm process 600uA/MHz, 1.5 uA standby Medical, Automotive & Industrial

Legacy Cores Next-generation migration to RX

High Performance CPU, FPU, DSC

Embedded Security

Up to 10 DMIPS, 130nm process350 uA/MHz, 1uA standbyCapacitive touch

Up to 25 DMIPS, 150nm process190 uA/MHz, 0.3uA standbyApplication-specific integration

Up to 25 DMIPS, 180, 90nm process 1mA/MHz, 100uA standby Crypto engine, Hardware security

Up to 165 DMIPS, 90nm process 500uA/MHz, 2.5 uA standby Ethernet, CAN, USB, Motor Control, TFT Display

High Performance CPU, Low Power

Ultra Low PowerGeneral Purpose

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Microcontroller and Microprocessor Line-up

Superscalar, MMU, Multimedia Up to 1200 DMIPS, 45, 65 & 90nm process Video and audio processing on Linux Server, Industrial & Automotive

Up to 500 DMIPS, 150 & 90nm process 600uA/MHz, 1.5 uA standby Medical, Automotive & Industrial

Legacy Cores Next-generation migration to RX

High Performance CPU, FPU, DSC

Embedded Security

Up to 10 DMIPS, 130nm process350 uA/MHz, 1uA standbyCapacitive touch

Up to 25 DMIPS, 150nm process190 uA/MHz, 0.3uA standbyApplication-specific integration

Up to 25 DMIPS, 180, 90nm process 1mA/MHz, 100uA standby Crypto engine, Hardware security

Up to 165 DMIPS, 90nm process 500uA/MHz, 2.5 uA standby Ethernet, CAN, USB, Motor Control, TFT Display

High Performance CPU, Low Power

Ultra Low PowerGeneral Purpose

R8C

16 Bit CISC

Superb Noise Performance

Low Power Consumption

Higher Functionality

ASSP Lineup

Low Pin Count Lineup

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Innovation The Cloud

TV

Remote Control

Medical Aggregation

Box

BP Monitor

Pedometer

Scale

8

Renesas’ Capacitive Touch Solution

Renesas now provides an advanced sensor scanning unit (SCU)

implemented in hardware along with a complete set of tools for

capacitive touch solutions. The FREE tools available include:

Tuning Software

Sensor API

Touch Library

Example Code

Apple’s Magic Trackpad

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Agenda

What can I do with the Renesas capacitive touch solution?

How do I actually code up an application with what Renesas

provides?

How to dance like MC Hammer!

Agenda

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Agenda

What can I do with the Renesas capacitive touch solution?

How do I actually code up an application with what Renesas

provides?

How to dance like MC Hammer!

Q&A

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Key Takeaways

Learn about typical capacitive touch interfaces and when to

use them

Understand how to handle keys, sliders, and wheels within

your application code

Become familiar with the Renesas touch library model and

its intuitive API

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Switches Wheels Sliders

Capacitive Touch Interfaces

Gestures

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Capacitive Touch Interfaces

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Distinct software layers for easy management

Firmware available in source format

Optimized driver tightly coupled to SCU

Complete Sensor API to enable customization

Support for Wheel, Slider, Switch, and Matrix configurations

Renesas Software Architecture

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Overview Of Using The Touch Library

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Overview Of Using The Touch Library

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The Primitives

Functions

Touch_Init

Touch_Register_Sensor

Touch_Unregister_Sensor

Touch_Start

Touch_Handler

Data Types

Sensor_Type_t

Sensor_State_t

Orientation_t

Polarity_t

Direction_t

Sensor_Params_t

Sensor_t

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Let’s Start Out Simple: The Switch

Switch Types Toggle Momentary Repeat Proximity

Sensor_Params_t SwitchParams;/* Initialization code */SwitchParams.id = 0;SwitchParams.type = TOGGLE_SWITCH;SwitchParams.channel = 7;SwitchParams.debounce = TRUE;SwitchParams.callback = Switch_Event

Touch_Register_Sensor(&SwitchParams);

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Let’s Start Out Simple: The Switch

int Switch_Event(Sensor_t *Switch){ if (Switch->state == ACTIVE) { Led_State(LED_7, ON); } else { Led_State(LED_7, OFF); }}

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The Electric Slide

Sensor_Params_t SliderParams;/* Initialization code */SliderParams.id = 1;SliderParams.type = SLIDER;SliderParams.channel = 1;SliderParams.count = 6;SliderParams.resolution = 2;SliderParams.orientation = EAST_WEST;SliderParams.callback = Slider_Event

Touch_Register_Sensor(&SliderParams);

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The Electric Slide

int Slider_Event(Sensor_t *Slider){ if (Slider->state == TOUCHED) { if (Slider->position <= 8) { /* … */ } else if (Slider->position <= 16) { /* … */ }

/* … */ }}

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The Wheels On The Bus Go…

Sensor_Params_t WheelParams;/* Initialization code */WheelParams.id = 2;WheelParams.type = WHEEL;WheelParams.channel = 10;WheelParams.count = 4;WheelParams.resolution = 4;WheelParams.callback = Wheel_Event

Touch_Register_Sensor(&WheelParams);

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Putting It All Together

What type of sensors?How many channels required?Single chip or multi-chip design?Multi-touch support?Sensor rejection?

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But Wait…

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Questions?

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Innovation The Cloud

TV

Remote Control

Medical Aggregation

Box

BP Monitor

Pedometer

Scale

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Thank You!

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Where To Get Stuff