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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.
Description
LDS6003 Features
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.
Versatile, accurate capacitance-
to-digital converter (CDC)
•ꢀ 500ꢀkHzꢀsigma-deltaꢀCDC
•ꢀ 6ꢀcapacitanceꢀsensorꢀinputꢀchannels
•ꢀ 2ꢀmsꢀupdateꢀrateꢀperꢀactiveꢀsensor
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.
Integrated, automatic
calibration algorithms
•ꢀ Environmentalꢀcompensation
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
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.
•ꢀ On-chipꢀRAMꢀtoꢀstoreꢀcalibrationꢀdata
Integrated touch preference modes
•ꢀ Strongestꢀsingleꢀtouch
•ꢀ Strongestꢀtwoꢀtouches
®
•ꢀ Unrestrictedꢀ(all)ꢀtouches
C0
LDS6003
C1
C2
Ultra-low touch sensor
power consumption*
•ꢀ Operatingꢀmodeꢀ(typical):ꢀꢀ
<150 uW (VDD1=1.8V)
Power-On
Reset Logic
Calibration
Engine
Sigma-Delta
CDC
C3
C4
C5
•ꢀ Shutdownꢀmodeꢀ(typical):ꢀꢀ
VDD1
<1 uW (VDD1=1.8V)
Calibration
RAM
VSS1
RESETB
TEST
Flexible interface options
•ꢀ SPI-compatibleꢀserialꢀI/F
•ꢀ I2C-compatible serial I/F
Control and
Data Registers
•ꢀ SeparateꢀVDDIO level for serial interface
•ꢀ GPIOꢀandꢀInterruptꢀOutput
* ꢂxcludes I/F and voltage dependent VDDIO current
500 kHz
Excitation
Source
SHIELD
VDDIO
I/F SEL
Serial Interface and
Control Logic
Interrupt and GPIO Logic
SD0/ SDI/ SCLK/ CSB/
SCL
GPIO
INTB
SDA
A1
A1
Figure 1. LDS6003 block diagram
IDT® LDS6003 PꢀꢁꢂTOꢀCH™ CꢃPꢃCITꢃꢄCꢂ TOꢀCH IC
1