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ID 411C: Capacitive Touch User
Interfaces and Hardwarebased Solutions
Renesas Electronics America Inc.
Nelson Quintana
Senior Manager, Marketing
12 October 2010
Version 1.2
© 2010 Renesas Electronics America Inc. All rights reserved.
Mr. Nelson Quintana
 Senior Manager, Product Marketing
 Business Development for White Goods and Small
Appliance Market Segments heavily focused on User
Interface Applications
 Renesas R8C/3xT Capacitive Touch MCU Roadmap
Definition
 Responsible for Renesas 8-/16-bit MCU Strategy in the
Americas
PREVIOUS EXPERIENCE:
 Over nine years at NEC Electronics America as a Field and
Technical Application Engineer for 8-bit and 16-bit
Microcontroller products and Development tools
 BSEE in Digital Design with concentration in
Microprocessor/Microcontroller systems from San Francisco
State University
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Renesas Technology and Solution Portfolio
Microcontrollers
& Microprocessors
#1 Market share
worldwide *
ASIC, ASSP
& Memory
Advanced and
proven technologies
Solutions
for
Innovation
Analog and
Power Devices
#1 Market share
in low-voltage
MOSFET**
* 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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© 2010 Renesas Electronics America Inc.
All rights reserved.
Renesas Technology and Solution Portfolio
Microcontrollers
& Microprocessors
#1 Market share
worldwide *
Solutions
for
Innovation
ASIC, ASSP
& Memory
Advanced and
proven technologies
Analog and
Power Devices
#1 Market share
in low-voltage
MOSFET**
* 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).
4
© 2010 Renesas Electronics America Inc.
All rights reserved.
Microcontroller and Microprocessor Line-up
Superscalar, MMU, Multimedia
High Performance CPU, Low Power
High Performance CPU, FPU, DSC
 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
 Up to 165 DMIPS, 90nm process
 500uA/MHz, 2.5 uA standby
 Ethernet, CAN, USB, Motor Control, TFT Display
 Legacy Cores
 Next-generation migration to RX
General Purpose
 Up to 10 DMIPS, 130nm process
 350 uA/MHz, 1uA standby
 Capacitive touch
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Ultra Low Power
Embedded Security
 Up to 25 DMIPS, 150nm process  Up to 25 DMIPS, 180, 90nm process
 190 uA/MHz, 0.3uA standby
 1mA/MHz, 100uA standby
 Application-specific integration  Crypto engine, Hardware security
Microcontroller and Microprocessor Line-up
R8C
Superscalar, MMU, Multimedia
 Up to 1200 DMIPS, 45, 65 & 90nm process
 Video and audio processing on Linux
 Server, Industrial & Automotive
Capacitive
 Up to 500 DMIPS, 150 & 90nm process
High Performance CPU, Low Power
 600uA/MHz, 1.5 uA standby
Touch Solution
 Medical, Automotive & Industrial
High Performance CPU, FPU, DSC
 Up to 165 DMIPS, 90nm process
 500uA/MHz, 2.5 uA standby
 Ethernet, CAN, USB, Motor Control, TFT Display
 Legacy Cores
 Next-generation migration to RX
General Purpose
 Up to 10 DMIPS, 130nm process
 350 uA/MHz, 1uA standby
 Capacitive touch
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© 2010 Renesas Electronics America Inc.
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Ultra Low Power
Embedded Security
 Up to 25 DMIPS, 150nm process  Up to 25 DMIPS, 180, 90nm process
 190 uA/MHz, 0.3uA standby
 1mA/MHz, 100uA standby
 Application-specific integration  Crypto engine, Hardware security
Innovation
Portable Consumer
Appliances
Touch Screen
Phone
Medical
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© 2010 Renesas Electronics America Inc.
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Office Equipment
Touch controllers that fit your products best
Renesas’ hardware-assisted touch sensing MCU is
‘ahead of its class’ for providing full system control
and overall lower power consumption without
sacrificing touch performance
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© 2010 Renesas Electronics America Inc.
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Agenda
 Key Reasons to Use Capacitive Touch
 Typical Uses
 Methods and Design Considerations
 Solutions Available
 Renesas Solution
 Key features
 Benefits of hardware-assisted touch
 Tools
 Target Applications
 Roadmap
 Q&A
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© 2010 Renesas Electronics America Inc.
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Key Takeaways
By the end of this session you will be able to:
 Know about market trends in HMI technologies
 Understand types of capacitive touch solutions available
 Identify pros and cons of hardware and software-based
solutions
 Recognize the benefits of Renesas’ touch solution
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© 2010 Renesas Electronics America Inc.
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Key Reasons for Using Capacitive Touch
 Better Aesthetics
 Higher Reliability
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Key Reasons for Using Capacitive Touch (2)
 Easier Maintenance
 Controls Reusability
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Typical Uses of Capacitive Touch Interfaces
Keys
Wheels
Touch Screens
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Sliders
Capacitive Touch Detection Methods
Mutual Capacitance *



Power Consumption:
Medium/High
Emissions: Medium/High
Immunity: Medium/High
Self Capacitance *



Power Consumption:
Low
Emissions: Low
Immunity: Medium
* Attributes may vary depending on implementation
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© 2010 Renesas Electronics America Inc.
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Question
What are typical challenges with touch design?
Answer:
 Touch sensitivity, noise, response time, and
debugging
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Design Considerations






PCB layout
Surface overlay
Calibration and tuning
Drift compensation
Filtering
Patents
Layout Guidelines
Overlay
Sensor Patterns/Shape
Sensor
underneath
panel
d
k (dielectric constant)
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© 2010 Renesas Electronics America Inc.
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MCU-based Capacitive Touch Solutions1
MCU
Suppliers
Technology “Names”
Main
Detection
Method
HardwareAssisted
Detection2
Types of
Solutions
Available
Renesas
Series Capacitance Voltage
Division
Self-capacitance
Yes
Touch MCU
Atmel
Charge Transfer Technology
(QTouch and QMatrix)
Self- and
Mutualcapacitance
Yes
(MaxTouch)
Touch MCU; Sw
Library
Cypress
1)CapSense Successive
Approximation (CSA)
2)CapSense Sigma-Delta (CSD)
Mutualcapacitance
No
Touch MCU
Freescale
1)Advanced Touch Logic (ATL)
2)Capacitive Turbo Sensing (CTS)
Self-capacitance
No
Sw Library
Microchip
Relaxation Oscillator
Self-capacitance
No
Touch MCU; Sw
Library
ST
RC Acquisition
Self-capacitance
No
Sw Library
1 Information
based on information available through public websites as of Sep 2010
to Renesas MCU-based solution
2 Comparable
 Software-based solution impacting overall performance and
power consumption
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© 2010 Renesas Electronics America Inc.
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Benefits of Renesas Capacitive Touch Solution
1 Single-chip MCU Solution
2 Specialized Touch Hardware
3 Low Power Consumption
Capacitive Touch and System Control
Sensor Control Unit (SCU)
frees up CPU
Standby Modes and Full Operation
4 Low System Cost
Minimum External Components
5 Flexible and Easy
Optimized API, Advanced Debug
and Full Support
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© 2010 Renesas Electronics America Inc.
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R8C/3xT Single-chip Solution
 System Control: LED’s, buzzer, communication, analog inputs, safety
 Touch Control: Keys, sliders, wheels configurations
CPU
DTC
RAM
Thermometer
Flash
Memory
I²C/SPI/LIN
COMM
Speaker
Timers
Oscillator
Debug
LVD
GPIO
POR
Display
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A/D
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Sensor Control Unit
R8C/3xT
..
.
R8C/3xT Detection Mechanism
Simplified Connection
1
“VCHxA”
Charge Cc
Rr
CHxA
Cx (touch) > Cx (no touch)
CH0
Cr
2
Cx
Discharge Cc
CHxB
Measure “VCHxA” Voltage
Vc
Cr + Cx
Vth
Rc
3
Counter
Cr
VCHxA =
CHxC
Cc
n
4
VCHxA < Vth ?
5
Get discharge count
Voltage
VCHxA No Touch
Threshold
Voltage
VCHxA Touch
Time
SCU handles all the
sequencing and timing
Discharge Count
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Sensor Control Unit (SCU)
1

2


3

4
Control and Error Management
Measurement and Sequencing/Scanning
Noise Countermeasure
Data transfer
Sensor Control Unit (SCU)
1
Trigger
Signal
Trigger
control block
Clock
Count source
control block
1
1
Status counter
(5-bits)
2
Timing variable
counter
1
Channel control
counter
Status decoder
Measurement
block
Secondary
counter
1
Channel 1
control block
Channel
Selection
Touch
Signal
2
3
2
4
Primary counter
Sensor
DMA
Data buffer
4
4
Transfer request
control block
Interrupt
control block
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To RAM
DTC Request
1
INT Request
Automated Scanning
 Software or hardware triggered
 Single or multiple channels
 Ascending or descending sequence
 Interrupt on scan completion
Sequence
Start
Measure Ch 0
Measure Ch 1
Trigger
R8C/33T
Timer
RC
Measure Ch 3
SCU
/SCUTRG
Measure Ch 2
Trigger
Control Block
Measure Ch 4
SCU Interrupt
SCUCR0
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Status
Decoder
R8C/3xT Low CPU Bandwidth
 CPU used 100% in software solution
 CPU in R8C/3xT
 Fully stopped
 Or system functions
 Less than 15% CPU usage
CPU Active
(Touch Scanning)
Softwarebased
solution
CPU
CPU
R8C/3xT
Option A
R8C/3xT
Option B
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CPU Active
(System Functions)
Not Operating
SCU
Scanning + Data Transfer
CPU
System Functions
SCU
Scanning + Data Transfer
CLK
…
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CPU Active
(Touch Post
Processing)
Less than
15% of
total CPU time
(20MHz)
R8C/3xT Low Power Consumption
T2=340uS
T1=100mS
Touch
Detection
Post
Processing
T3 =200uS
T3 =200uS
T2=340uS
T1=100mS
Touch
Detection
Post
Processing
Current
Time
Timer
INT
Timer
INT
SCU
Standby (Wait Mode)
SCU
CPU
Standby (Wait Mode)
SCU
CPU
Clock Source
Low-speed OCO
High-speed OCO
High-speed OCO
Peripheral Clock
125kHz
5MHz
5MHz
CPU State
Stop
Stop
Active
Code Execution
N/A
N/A
Yes
State Current *
8.3uA
610uA (single ch)
2mA
Average Current *
Sub 16uA (single channel)
* Typical value based on specific test platform
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Low System Cost
No
External ICs
CPU
R8C
CPU
Flash
Step-down
converter IC
1.8V–5.5V
RAM
EEPROM IC
Data Flash
COMM
SCU
Crystal
Reset IC
A/D
LVD / POR
GP Timers
Key1 Key2 Key3
CH3
CH4
CH5
CHxA
CHxB
20mA Ports
CH0
CH1
CH2
Key4 Key5 Key6
CHxC
Watchdog
Debug
WDT IC
1
40MHz Osc.
3
Key7 Key8 Key9
Cc
Rc
Cr
2
1 On-board components
2 Two Caps + one resistor
3 One resistor per each channel for protection
4 4 sensors/keys per channel (matrix configuration)
5 20mA Ports
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© 2010 Renesas Electronics America Inc.
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4
APP
Example
Renesas API
~2.3KB code
APP Specific
Optimized Software Architecture
User
Application
Functional Noise Rejection (Debounce, Wipedown)
Functional
Implementation
Wheel
Decoder
Slider
Decoder
Switch
Function
Sensor Touch
Decision
(Binary)
Sensor
© 2010 Renesas Electronics America Inc.
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Matrix
Decoder
Drift
Compensation
Reference and Threshold Firmware
Low Level
Filter
Hardware Interface
26
Application
SCU Driver
Auto
Calibration
Software vs. Hardware Solutions Summary
 Software




CPU Operation-intensive
Tighter timing margins
Interrupt handling limitation
More code
Why do this?
27
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Hardware
Automated process
CPU available for system
Lower Power
Less code
When you can have this…
Advanced Tuning Tools
Intuitive GUI
Measurement
Parameter Setting
Circuit Modeling
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Self-contained Touch Evaluation System
 Evaluation System Features
R8C/33T (32-pin)
Keys, Wheel, Slider
LED Display
Ambient light sensor
Buzzer
Current consumption
measurement
 E8a Debug Emulator
 CD containing:
– Touch API and sample
application code
– Workbench Tool
– Free 64KB C Compiler
– Quick Start Guide,
Manuals, Application
Notes






29
© 2010 Renesas Electronics America Inc.
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Key Matrix
E8a Debugger
Wheel
Slider
Ordering Information:
P/N: YR8C33TKIT01
www.am.renesas.com/capacitivetouch
Question
What are the top benefits of Renesas Touch Solution?
Answer:
 Touch and system control
 Low CPU bandwidth
 Low power while touch detection
 Low cost
 Optimized API, advanced tools and full support
30
© 2010 Renesas Electronics America Inc.
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Touch MCU Roadmap
Function / Performance
• 36ch SCU ch
• 80 LQFP
• 128 KB Flash
• 10 KB RAM
• 28ch SCU ch
• 64 LQFP
• 128 KB Flash
• 10 KB RAM
• 22ch Touch
• 16-32 KB Flash
• 1.5-2.5 KB RAM
R8C/33T
32 LQFP
R8C/3JT
40 pins QFN
• 18ch Touch
• 16-32 KB Flash
• 1.5-2.5 KB RAM
• 8ch SCU ch
• 20 LSSOP
Under Development
2010
31
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Under Planning
2011
R8C/3xT ‘Touches Your Life’
Office Equipment
Exercise Equipment
Kitchen Appliances
Portable Devices
Medical Equipment
32
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Security
Keypads
Audio Equipment
Q&A
33
© 2010 Renesas Electronics America Inc.
All rights reserved.
Innovation
Portable Consumer
Appliances
Explore
New Frontiers…
Touch Screen
Phone
Medical
34
© 2010 Renesas Electronics America Inc.
All rights reserved.
Office Equipment
Thank You!
35
© 2010 Renesas Electronics America Inc.
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Appendix
36
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All rights reserved.
R8C’s Advanced On-chip Debug Unit
 True 1-Wire Communication
I/F
 Real-time memory access via
Debug DMA
 Dedicated Clock for Debug
Engine
 On-chip Trace
 8 Instructions and 1 Data
Breakpoint
 Up to 255 SW Breakpoints
when using HEW
 Interface supports
Workbench
R8C/3xT
Before execution
Address match: 8
Data break
1
Trace mode
On-chip trace
Trace info
Branch destination/data access: 8
Trace condition
Combination of 2 points
Break
Break
RAM memory
reference/change
37
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Refer during user
program execution (run)
(RAM trace)
Renesas Electronics America Inc.