®
semiconductor solutions
VDD1
RESETB
TEST
VDDIO
I/F_SEL1
SHIELD
LED0-
LED9
VSS2
VDD2
VSS1
Serial Interface and
Control Logic
Interrupt and GPIO Logic
LDO
Excitation
Source
Calibration
RAM
Control and
Data Registers
LDS6120
Power-On
Reset Logic
Calibration
Engine CDC
LDOEN
I/F_SEL0
INTBGPIOCSB/
A0
SCLK/
SCL
SDI/
A1
SD0/
SDA
LED Driver
Current Sources
Sigma-Delta
CDC
Switch
Matrix
C1/DCM 11
C0/DCM10
C9/DCM9
C10/LED0
C19/LED9
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
The LDS6100/6120 family of capacitance touch controllers from Integrated Device Technoogy
®
is
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
inputs, 10 of which may be configured as direct communication mode (DCM) outputs that emulate
mechanical buttons, enabling streamlined communication of touch events without the need to query the
serial interface bus.
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.
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, I
2
C-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.
1
IDT
®
LDS6100-6120 PURETOUCH
®
CAPACITANCE TOUCH FAMILY FLYER
Benefits
• Ease-of-use and flexible configurability
with optimized, state machine
architecture
• Longer battery life enabled with
ultra-low power consumption
• Low BOM cost and minimized solution
footprint using bare minimum of
external components
• Robust touch performance via
proprietary noise-filtering algorithms
• Customizable visual feedback effects
with integrated LED drivers (LDS6120)
Applications
• Mobile handsets and smartphones
• Personal media players (MP3/MP4)
• Gaming devices
• Remote controls
• Television, audio/video
• Set-top boxes, multi-function printers,
enterprise telephony
• White goods
• Industrial and medical devices
Figure 1. LDS6120 block diagram
2
IDT
®
LDS6100-6120 PURETOUCH
®
CAPACITANCE TOUCH FAMILY FLYER
Ideal Solution for Portable and “Green” Applications
The LDS6100/6120 is optimized for ultra-low power consumption. 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 current consumption of <70 μA (typical at 1.8V), the LDS6100 products may be
operated continuously in full power mode, eliminating the need for introduced latencies that can cause
noticeable delays and degrade the user experience. Where power consumption is of the utmost
importance, low power modes with configurable latencies may be utilized to further reduce current
below 25 μA (100ms sleep cycle).
The LDS6100/6120 family is optimized for a minimized solution footprint, with the functionality of multiple
components consolidated into a single device and a bare minimum of required external passive
components. A variety of package options are available including a 4mm x 4mm 28 lead TQFN package, a
5mm x 5mm 40 lead TQFN package (both with 0.75mm package thickness), or a 5.3mm x 10.2mm SSOP
package for applications requiring a wider lead pitch.
*For direct application of 1.8V voltage. For voltages higher than 1.8V, apply voltage to VDDIO and tie VDD1 to ground though C2.
Figure 2. LDS6120 application diagram (typical)
LDS 6100 / 6120 Features
Versatile, accurate CDC • Up to 20 capacitance sensor input channels
• Configurable hysteresis and debounce
Ultra-low touch sensor power
consumption
• Full power operating mode (typical): <125 μW (VDD1=1.8V)
• Low power operating mode (typical): <50 μW (VDD1=1.8V,
100ms sleep cycle)
• Shutdown mode (typical): <1 μW (VDD1=1.8V)
Integrated, automatic calibration
algorithms
• Auto environmental compensation
• Integrated noise immunity algorithms for high-EMI applications
Integrated touch preference modes • Strongest single touch / two touches
• Unrestricted (all) touches
Built-in slider/scroll support • Location, scroll direction, and 2x interpolation supported natively