LDS6003 Datasheet, PDF (1/2 Pages) Integrated Device Technology – PureTouch™ Capacitance Touch IC

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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.
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
• I²C-compatible serial I/F
• Separate V_DDIO level for serial interface
• GPIO and Interrupt Output
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
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.
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LDS6003
C0
C1
Power-On
Calibration
Sigma-Delta
C2
Reset Logic
Engine
CDC
C3
C4
VDD1
C5
VSS1
Calibration
RAM
RESETB
TEST
Control and
Data Registers
* Excludes I/F and voltage dependent V_DDIO current
VDDIO
I/F SEL
Serial Interface and
Control Logic
Interrupt and GPIO Logic
SD0/ SDI/ SCLK/ CSB/
SDA A1 SCL A1
GPIO
INTB
Figure 1. LDS6003 block diagram
500 kHz
Excitation
Source
SHIELD
IDT^® LDS6003 PureTouch™ Capacitance Touch IC
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