semiconductor solutions
®
®
LDS6003
PureTouch™ Capacitance Touch IC
The LDS6003 PureTouch™ controller empowers system designers to create streamlined, attractive,
and reliable product designs, enabling the replacement of mechanical controls with capacitive touch
buttons, sliders, and scroll wheels.
LDS6003 Features
Versatile, accurate capacitance-
to-digital converter (CDC)
• 500 kHz sigma-delta CDC
• 6 capacitance sensor input channels
• 2 ms update rate per active sensor
Integrated, automatic
calibration algorithms
• Environmental compensation
• On-chip RAM to store calibration data
Integrated touch preference modes
• Strongest single touch
• Strongest two touches
• Unrestricted (all) touches
Ultra-low touch sensor
power consumption*
• Operating mode (typical):
<150 uW (VDD1=1.8V)
• Shutdown mode (typical):
<1 uW (VDD1=1.8V)
Flexible interface options
• SPI-compatible serial I/F
• I
C-compatible serial I/F
• Separate V
DDIO
level for serial interface
• GPIO and Interrupt Output
* excludes I/F and voltage dependent V
DDIO
current
VDDIO
I/F SEL
Serial Interface and
Control Logic
SD0/
SDA
SDI/
A1
SCLK/ CSB/
SCL
A1
Interrupt and GPIO Logic
500 kHz
Excitation
Source
TEST
Control and
Data Registers
2
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Description
The LDS6003 is a programmable capacitance-to-digital converter (CDC) designed for use with capacitive
sensor arrays implementing touch-based input controls including sliders, scroll wheels, and buttons.
Featuring 6 sensor inputs, the LDS6003 provides the flexibility to implement multiple touch inputs using
a single controller.
The capacitive sensor inputs are directed through an integrated switch matrix to a 500 kHz sigma-delta
CDC which senses changes in the external sensor array. When a sufficiently large change in capacitance
occurs, a sensor activation is registered and the host processor is notified.
On-chip calibration logic continuously monitors the environment and automatically adjusts on-and-off
threshold levels to prevent false sensor activation. The LDS6003 is offered with both SPI-compatible and
2
I C-compatible interfaces (active interface selected by I/F select pin) and features a general-purpose input/
output (GPIO) and interrupt output for additional communication with the host processor.
LDS6003
Switch
Matrix
C0
C1
Power-On
Reset Logic
Calibration
Engine
Sigma-Delta
CDC
C2
C3
C4
VDD1
Calibration
RAM
C5
VSS1
RESETB
SHIELD
GPIO
INTB
Figure 1.
LDS6003 block diagram
IDT
®
LDS6003 PureTOuCH™ CaPaCITanCe TOuCH IC
1
Flexible package options:
• 28 pin 4mm x 4mm QFN,
0.8mm max height
• 28 pin 5.3mm x 10.2mm SSOP,
1.83mm max height
Power supply range:
• Touch supply (VDD1): 1.65V - 1.95V
• V
DDIO
=1.65V - 3.6V
Applications:
• Mobile handsets and smartphones
• Personal music and media players
(MP3/MP4)
• Gaming devices
• Remote controls
• Television, audio/video
• Set-top boxes
• Multi-function printers
• Enterprise telephony
Ideal solution for portable applications
The LDS6003 is optimized for minimal power consumption, with touch sensor circuits operating from a
1.8V supply voltage. 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 power consumption of
<150 uW (typical), the LDS6003 may be operated continuously in full power mode, even when battery life
is of premium importance. The low power architecture of the IDT PureTouch™ solutions eliminates the
need for introduced latency periods that can cause noticeable delays and degrade the user experience.
When touch inputs are not required to be active, the LDS6003 may be put into standby mode, reducing
typical power consumption below 1 uW.
VDDIO (1.65V~3.6V)
SENSOR
PCB
LDS6003
VDDIO
SHIELD
C0
C1
C2
C3
C4
C5
I/F SEL
VDD
VSS
Host Processor
with SPI
CSB
SCLK
SDI
SDO
SSB
SCLK
MOSI
MISO
floating
VDD1 (1.65V~1.95V)
VDD1
INTB
RESETB
GPIO
TEST
INTB
RESETB
floating
floating
C1
VSS1
C1: > 1uF
Figure 2.
LDS6003 application diagram
Discover what IDT know-how can do for you.
www.IDT.com/go/Touch
© 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.
®
Printed in USA 08-09/MG/BWD/PDF_r7_v1
FLYR-LDS6003-089
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