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LDS6028
PureTouchTM Capacitance Touch IC with Integrated Keypad LED Drivers
The LDS6028 PureTouchTM controller empowers 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.
LDS6028 Features
Versatile, accurate capacitanceto-digital converter (CDC) * 500kHzsigma-deltaCDC * 15capacitancesensorinputchannels * 2msupdaterateperactivesensor Integrated keypad LED drivers * C7-C14sensorinputsconfigurable as keypad LED drivers * 7.75mAmaximumdrivingcurrent (up to 62 ma available by connecting multiple outputs to a single LED) * Flexibledimmingcontrol * Processor-freesynchronizationwith touch events Integrated, automatic calibration algorithms * Environmentalcompensation * On-chipRAMtostorecalibrationdata Integrated touch preference modes * StrongestSingleTouch * StrongestTwoTouches * Unrestricted(All)Touches Ultra-low touch sensor power consumption* * Operatingmode(typical): <150 uW (VDD1=1.8V) * Shutdownmode(typical): <1 uW (VDD1=1.8V)
VDDIO VSS1 Power-On Reset Logic
Description
The LDS6028 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 15 sensor inputs, 8 of which are dual-purpose I/Os configurable as either capacitive sensor inputs or keypad LED drivers, the LDS6028 provides the flexibility to implement multiple touch inputs with integrated lighting effects using a single controller. When configured for capacitive sensing, the I/Os 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. LED lighting effects are automatically initiated by a touch event with no processor intervention required. On-chip calibration logic continuously monitors the environment and automatically adjusts on-and-off threshold levels to prevent false sensor activation. The LDS6028 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.
LDS6028
Switch Matrix
C0 C1 Sigma-Delta CDC
Calibration Engine
C6 C7/LED0
VDD1 Calibration RAM LED Driver Current Sources
C14/LED7 LED0LED7 VDD2 VSS2
RESETB Control and Data Registers
TEST
* Excludes LED driver current and I/F and voltage dependent VDDIO current
I/F SEL
Serial Interface and Control Logic SD0/ SDA SDI/ A1 SCLK/ CSB/ SCL A0
Interrupt and GPIO Logic
500 kHz Excitation Source
SHIELD
GPIO
INTB
IDT(R) LDS6028 PurETOuCHTM CaPaCITanCE TOuCH IC
Figure 1. LDS6028 block diagram
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Flexible interface options * SPI-compatibleserialI/F * I C-compatible serial I/F * SeparateVDDIO level for serial interface * GPIOandInterruptOutput Small footprint package * 40pin5mmx5mmQFN, 0.8mm max height Power supply range * Touchsupply(VDD1):1.65V-1.95V * LEDsupply(VDD2):3.0V-5.5V * VDDIO=1.65V-3.6V Applications * Mobilehandsetsandsmartphones * Personalmusicandmediaplayers (MP3/MP4) * Gamingdevices * Remotecontrols * Television,audio/video * Set-topboxes * Multi-functionprinters * Enterprisetelephony
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Integrated keypad LED drivers
The LDS6028 features integrated keypad LED drivers enabling the implementation of visual feedback for touch-based controls and fun lighting effects. The keypad LEDs may be powered either from Vbattery directly or from a regulated voltage supply. On/off transition times are programmed globally for all LEDs and maximum current may be programmed for each LED individually. LEDs may be either manually controlled or synchronized to automatically trigger when a touch event occurs.
Ideal solution for portable applications
The LDS6028 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 LDS6028 may be operated continuously in full power mode, eliminating the need for introduced latencies that can cause noticeable delays and degrade the user experience. The total solution footprint is also optimized for portable applications, with the functionality of multiple components consolidated into a single device. With integrated keypad LED driver functionality, the LDS6028 is a flexible solution combining the functionality of two discrete ICs into a compact 5mm x 5mm TQFNpackagewith0.75mmpackagethickness.
SENSOR PCB VDDIO (1.65V~3.6V)
LDS6028
VDDIO SHIELD C0 C1 C2 C3 C4 C5 C6 C7/LED0 C8/LED1 C9/LED2 C10/LED3
floating
Host Processor with SPI
VDD VSS I/F SEC
CSB SCLK SDI SDO
SSB SCLK MOSI MISO
floating floating
INTB RESETB GPIO TEST0-1
INTB RESETB
floating floating
LED0-LED3
C11/LED4 C12/LED5 C13/LED6 C14/LED7
floating floating
VDD2 (3.0V~5.5V) VDD1 (1.65V~1.95V)
floating
VDD1 VDD2 C2 C1 VSS1 VSS2
C1=C2: > 1uF
Figure 2. LDS6028 application diagram
Discover what IDT know-how can do for you.
www.IDT.com/go/touch
(c) 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.
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Printed in USA 08-09/MG/BWD/PDF_r7_v1
FLYR-LDS6028-089

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