semiconductor solutions
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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.
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
• 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
A0
Interrupt and GPIO Logic
500 kHz
Excitation
Source
TEST
2
®
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
2
and 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.
LDS6005
Switch
Matrix
C0
C1
C2
C3
Power-On
Reset Logic
Calibration
Engine
Sigma-Delta
CDC
VDD1
Calibration
RAM
C9
VSS1
RESETB
Control and
Data Registers
SHIELD
GPIO
INTB
Figure 1.
LDS6005 block diagram
IDT
®
LDS6005 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 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.
VDDIO (1.65V~3.6V)
LDS6005
SENSOR
PCB
VDDIO
SHIELD
C0
C1
C2
C3
C4
C5
C6
C7
C8
C9
VDD1 (1.65V~1.95V)
VDD1
I/F SEL
VDD
VSS
Host Processor
with SPI
CSB
SCLK
SDI
SDO
SSB
SCLK
MOSI
MISO
INTB
RESETB
GPIO
TEST
INTB
RESETB
floating
floating
C1
VSS1
C1: > 1uF
Figure 2.
LDS6005 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-LDS6005-089
Microchip MCU
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