semiconductor solutions
®
LDS6100/6120 Touch Family
PureTouch Capacitance Touch IC Family with Integrated LED Drivers
®
The IDT LDS6100/6120 family of PureTouch
®
controllers empower system designers to create
streamlined, attractive and reliable product designs with capacitive touch controls. Integrated LED drivers
allow visual feedback to be implemented when a touch occurs, without the need for host intervention.
Benefits
• Ease-of-use and flexible configurability
with optimized, state machine
architecture
• Longer battery life enabled with
ultra-low power consumption
• Low BOM cost and minimized solution
footprint using bare minimum of
external components
• Robust touch performance via
proprietary noise-filtering algorithms
• Customizable visual feedback effects
with integrated LED drivers (LDS6120)
Description
The LDS6100/6120 family of capacitance touch controllers from Integrated Device Technoogy
®
is
optimized for the implementation of touch-based input controls including sliders, scroll wheels and
buttons. A low power programmable capacitance-to-digital converter (CDC) supports up to 20 sensor
inputs, 10 of which may be configured as direct communication mode (DCM) outputs that emulate
mechanical buttons, enabling streamlined communication of touch events without the need to query the
serial interface bus.
When configured for capacitive sensing, the touch inputs are directed through an integrated switch matrix
to a sigma-delta CDC which senses changes in the external sensor array. When a change in capacitance
occurs above the user defined threshold, a touch event is recognized and the host processor is notified via
an interrupt pin or DCM output. On the LDS6120 products, a variety of built-in LED lighting effects may
be automatically initiated by a touch event with no processor intervention required.
On-chip calibration logic continuously monitors the environment and automatically adjusts touch
sensitivity to insure robust performance. Proprietary noise-filtering algorithms may also be activated to
prevent false sensor activation in noisy system environments. The LDS6100/6120 family is offered with
SPI-compatible, I
2
C-compatible and SMBus-compatible interfaces, selectable in real-time using the I/F
select pins. General-purpose input/output (GPIO) and interrupt outputs are also provided for additional
communication with the host processor.
Applications
• Mobile handsets and smartphones
• Personal media players (MP3/MP4)
• Gaming devices
• Remote controls
• Television, audio/video
• Set-top boxes, multi-function printers,
enterprise telephony
• White goods
• Industrial and medical devices
LDS6120
Switch
Matrix
Power-On
Reset Logic
Calibration
Engine
Sigma-Delta
CDC
CDC
C0/DCM10
C1/DCM 11
C9/DCM9
C10/LED0
C19/LED9
VDD2
VSS2
Calibration
RAM
RESETB
TEST
VDD1
VSS1
LDOEN
VDDIO
I/F_SEL0
I/F_SEL1
LED Driver
Current Sources
LED0-
LED9
Control and
Data Registers
LDO
Serial Interface and
Control Logic
SD0/
SDA
SDI/
A1
SCLK/ CSB/
SCL
A0
Interrupt and GPIO Logic
GPIO
INTB
Excitation
Source
SHIELD
Figure 1. LDS6120 block diagram
IDT
®
LDS6100-6120 PURETOUCH
®
CAPACITANCE TOUCH FAMILY FLYER
1
Ideal Solution for Portable and “Green” Applications
The LDS6100/6120 is optimized for ultra-low power consumption. In full power mode, sensor conversion
and calibration occur continuously, minimizing the time between touch event and touch detection. With its
ultra-low touch sensor current consumption of <70 μA (typical at 1.8V), the LDS6100 products may be
operated continuously in full power mode, eliminating the need for introduced latencies that can cause
noticeable delays and degrade the user experience. Where power consumption is of the utmost
importance, low power modes with configurable latencies may be utilized to further reduce current
below 25 μA (100ms sleep cycle).
The LDS6100/6120 family is optimized for a minimized solution footprint, with the functionality of multiple
components consolidated into a single device and a bare minimum of required external passive
components. A variety of package options are available including a 4mm x 4mm 28 lead TQFN package, a
5mm x 5mm 40 lead TQFN package (both with 0.75mm package thickness), or a 5.3mm x 10.2mm SSOP
package for applications requiring a wider lead pitch.
*For direct application of 1.8V voltage. For voltages higher than 1.8V, apply voltage to VDDIO and tie VDD1 to ground though C2.
Figure 2. LDS6120 application diagram (typical)
LDS 6100 / 6120 Features
Versatile, accurate CDC
Ultra-low touch sensor power
consumption
• Up to 20 capacitance sensor input channels
• Configurable hysteresis and debounce
• Full power operating mode (typical): <125 μW (VDD1=1.8V)
• Low power operating mode (typical): <50 μW (VDD1=1.8V,
100ms sleep cycle)
• Shutdown mode (typical): <1 μW (VDD1=1.8V)
• Auto environmental compensation
• Integrated noise immunity algorithms for high-EMI applications
• Strongest single touch / two touches
• Unrestricted (all) touches
• Location, scroll direction, and 2x interpolation supported natively
Integrated, automatic calibration
algorithms
Integrated touch preference modes
Built-in slider/scroll support
IDT
®
LDS6100-6120 PURETOUCH
®
CAPACITANCE TOUCH FAMILY FLYER
2
Integrated LED drivers (LDS6120)
• Up to 10 dual-purpose sensor inputs
configurable as LED drivers
• 7.75 mA maximum current per driver
(drivers may be combined for higher
current applications)
• Flexible dimming control
• Built-in blink, heartbeat effects
• Individual LED configurability
• Host-free synchronization with touch
events
Integrated Feature-Rich LED Drivers (LDS6120)
The LDS6120 products integrate a feature rich, highly configurable LED driver, enabling the implementation
of visual feedback for touch-based controls and fun lighting effects using a single controller. The minimum
and maximum current, transition times, and desired effect are programmable on an individual LED basis,
allowing for customized LED behavior for individual buttons. LEDs may be either synchronized to
automatically trigger when a touch event occurs or manually controlled using the host processor.
Flexible interface options
• SPI, I
2
C, and SMBus-compatible serial I/F options
• DCM outputs for mechanical switch emulation
• VDDIO level for serial interface
• GPIO and Interrupt Outputs
Flexible package options
• 28 pin—4mm x 4mm QFN
• 40 pin—5mm x 5mm QFN
• 28 pin—5.3mm x 10.2mm SSOP
Power supply range
• Touch supply (VDD1): 1.65V–5.5V *
• LED supply (VDD2): 3.0V–5.5V
• VDDIO = 1.65V–5.5V
* Supply voltages > 1.95V are applied to VDDIO pin
Feature Enhancements
Functionality
Part
Number
LDS6104
LDS6107
LDS6108
LDS6100
LDS6124
LDS6126
LDS6128
LDS6120
Touch
Sensors
Up to 8
Up to 13
Up to 16
Up to 20
Up to 8
Up to 11
Up to 16
Up to 20
DCM
Outputs
Up to 4
Up to 5
Up to 8
Up to 10
Up to 4
Up to 5
Up to 8
Up to 10
Up to 4
Up to 6
Up to 8
Up to 10
LED
Drivers
Integrated Features
Built-in
Slider/Scroll
3
3
3
3
3
3
3
3
3
3
3
3
Built-in
LED
Effects
Full Hystersis
and Debounce
Configurability
3
3
3
3
3
3
3
3
Package
28Id TQFN
28Id SSOP
40Id TQFN
40Id TQFN
28Id TQFN
28Id SSOP
40Id TQFN
40Id TQFN
Figure 3. The LDS 6100/6120 Touch Sensor family includes over 20 enhanced features
You can depend on IDT
Three decades of inventing the technology our markets demand gives IDT the knowledge base to supply
our customers with low power, mixed signal semiconductor solutions that enhance the digital media
experience. Our diverse and extensive product line, including timing, switching, interconnect, audio and
display products empowers leading OEMs to pursue technological advances in communications,
computing and consumer market applications with IDT engineers at their side. Service, support and
innovation: that’s IDT.
Discover what IDT know-how can do for you.
www.IDT.com/go/Touch6100
© 2009 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT and the IDT logo are registered trademarks of Integrated Device
Technology, Inc. All other brands, product names and marks are or may be trademarks or registered trademarks used to identify products or services of their respective owners.
®
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