®
®
semiconductor solutions
LDS6005
PureTouch™ Capacitance Touch IC
The LDS6005 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.
Description
The LDS6005 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 10 sensor inputs, the LDS6005 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 LDS6005 is offered with both SPI-compatible
and I2C-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.
VDD1
RESETB
TEST
VDDIO
I/F SEL
SHIELD
C1
C0
C2
C3
C9
VSS1
Switch
Matrix
Serial Interface and
Control Logic Interrupt and GPIO Logic
500 kHz
Excitation
Source
Calibration
RAM
Control and
Data Registers
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LDS6005
Power-On
Reset Logic
Calibration
Engine
Sigma-Delta
CDC
INTBGPIOCSB/
A0
SCLK/
SCL
SDI/
A1
SD0/
SDA
Figure 1. LDS6005 block diagram
1
IDT® LDS6005 PURETOUCH™ CAPACITANCE TOUCH IC
LDS6005 Features
Versatile, accurate capacitance-
to-digital converter (CDC)
• 500kHzsigma-deltaCDC
• 10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
• I2C-compatible serial I/F
• SeparateVDDIO level for serial interface
• GPIOandInterruptOutput
* Excludes I/F and voltage dependent VDDIO current
®
© 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-LDS6005-089
Discover what IDT know-how can do for you.
www.IDT.com/go/Touch
Ideal solution for portable applications
The LDS6005 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 LDS6005 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 LDS6005 may be put into standby mode, reducing
typical power consumption below 1 uW.
VDD1 (1.65V~1.95V)
C1
C1: > 1uF
SHIELD
LDS6005
C0
C1
C2
C3
C4
C5
C6
C7
C8
C9
VSS1
VDD1
SENSOR
PCB
VDDIO
I/F SEL
Host Processor
with SPI
CSB
SCLK
SDI
SDO
VDD
VSS
SSB
SCLK
MOSI
RESETB RESETB
MISO
INTB INTB
GPIO
floating
TEST
floating
VDDIO (1.65V~3.6V)
Figure 2. LDS6005 application diagram
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
• VDDIO=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