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| semiconductor solutions (R) (R) LDS6003 PureTouchTM Capacitance Touch IC The LDS6003 PureTouchTM 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 capacitanceto-digital converter (CDC) * 500kHzsigma-deltaCDC * 6capacitancesensorinputchannels * 2msupdaterateperactivesensor 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) Flexible interface options * SPI-compatibleserialI/F * I C-compatible serial I/F * SeparateVDDIO level for serial interface * GPIOandInterruptOutput * excludes I/F and voltage dependent VDDIO current VDDIO I/F SEL Serial Interface and Control Logic SD0/ SDA SDI/ A1 SCLK/ CSB/ SCL A1 Interrupt and GPIO Logic 500 kHz Excitation Source TEST Control and Data Registers 2 (R) 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 2 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. LDS6003 Switch Matrix C0 C1 Power-On Reset Logic Calibration Engine Sigma-Delta CDC C2 C3 C4 VDD1 Calibration RAM C5 VSS1 RESETB SHIELD GPIO INTB Figure 1. LDS6003 block diagram IDT(R) LDS6003 PureTOuCHTM CaPaCITanCe TOuCH IC 1 Flexible package options: * 28pin4mmx4mmQFN, 0.8mm max height * 28pin5.3mmx10.2mmSSOP, 1.83mm max height Power supply range: * Touchsupply(VDD1):1.65V-1.95V * VDDIO=1.65V - 3.6V Applications: * Mobilehandsetsandsmartphones * Personalmusicandmediaplayers (MP3/MP4) * Gamingdevices * Remotecontrols * Television,audio/video * Set-topboxes * Multi-functionprinters * Enterprisetelephony Ideal solution for portable applications The LDS6003 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 LDS6003 may be operated continuously in full power mode, even when battery life is of premium importance. The low power architecture of the IDT PureTouchTM solutions eliminates the need for introduced latency periods that can cause noticeable delays and degrade the user experience. When touch inputs are not required to be active, the LDS6003 may be put into standby mode, reducing typical power consumption below 1 uW. VDDIO (1.65V~3.6V) SENSOR PCB LDS6003 VDDIO SHIELD C0 C1 C2 C3 C4 C5 I/F SEL VDD VSS Host Processor with SPI CSB SCLK SDI SDO SSB SCLK MOSI MISO floating VDD1 (1.65V~1.95V) VDD1 INTB RESETB GPIO TEST INTB RESETB floating floating C1 VSS1 C1: > 1uF Figure 2. LDS6003 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. (R) Printed in USA 08-09/MG/BWD/PDF_r7_v1 FLYR-LDS6003-089 |
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