semiconductor solutions
®
LDS6100/6120 Touch Family
®
PureTouch Capacitance Touch IC Family with Integrated LED Drivers
The IDT LDS6100/6120 family of PureTouch® controllers empower system designers to create
streamlined, attractive and reliable product designs with capacitive touch controls. Integrated LED drivers
allow visual feedback to be implemented when a touch occurs, without the need for host intervention.
Description
Benefits
The LDS6100/6120 family of capacitance touch controllers from Integrated Device Technoogy® is
• Ease-of-use and flexible configurability
with optimized, state machine
optimized for the implementation of touch-based input controls including sliders, scroll wheels and
buttons. A low power programmable capacitance-to-digital converter (CDC) supports up to 20 sensor
architecture
inputs, 10 of which may be configured as direct communication mode (DCM) outputs that emulate
• Longer battery life enabled with
ultra-low power consumption
mechanical buttons, enabling streamlined communication of touch events without the need to query the
serial interface bus.
• Low BOM cost and minimized solution
footprint using bare minimum of
external components
When configured for capacitive sensing, the touch inputs are directed through an integrated switch matrix
to a sigma-delta CDC which senses changes in the external sensor array. When a change in capacitance
occurs above the user defined threshold, a touch event is recognized and the host processor is notified via
an interrupt pin or DCM output. On the LDS6120 products, a variety of built-in LED lighting effects may
be automatically initiated by a touch event with no processor intervention required.
• Robust touch performance via
proprietary noise-filtering algorithms
• Customizable visual feedback effects
with integrated LED drivers (LDS6120)
On-chip calibration logic continuously monitors the environment and automatically adjusts touch
sensitivity to insure robust performance. Proprietary noise-filtering algorithms may also be activated to
prevent false sensor activation in noisy system environments. The LDS6100/6120 family is offered with
SPI-compatible, I2C-compatible and SMBus-compatible interfaces, selectable in real-time using the I/F
select pins. General-purpose input/output (GPIO) and interrupt outputs are also provided for additional
communication with the host processor.
Applications
• Mobile handsets and smartphones
• Personal media players (MP3/MP4)
• Gaming devices
C0/DCM10
C1/DCM 11
• Remote controls
LDS6120
• Television, audio/video
Power-On
Reset Logic
Calibration
Engine
Sigma-Delta
CDC
CDC
C9/DCM9
C10/LED0
• Set-top boxes, multi-function printers,
enterprise telephony
C19/LED9
• White goods
LED0-
LED9
LED Driver
Current Sources
• Industrial and medical devices
Calibration
RAM
VDD2
VSS2
RESETB
TEST
Control and
Data Registers
VDD1
VSS1
LDO
LDOEN
VDDIO
I/F_SEL0
I/F_SEL1
Serial Interface and
Control Logic
Excitation
Source
SHIELD
Interrupt and GPIO Logic
SD0/ SDI/ SCLK/ CSB/
GPIO
INTB
SDA
A1
SCL
A0
Figure 1. LDS6120 block diagram
IDT® LDS6100-6120 PURETOUCH® CAPACITANCE TOUCH FAMILY FLYER
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