semiconductor solutions ® ® LDS6005 PureTouch™ Capacitance Touch IC The LDS6005 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. LDS6005 Features Versatile, accurate capacitanceto-digital converter (CDC) • 500 kHz sigma-delta CDC • 10 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 Description The LDS6005 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 10 sensor inputs, the LDS6005 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 LDS6005 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. • Strongest two touches ® • Unrestricted (all) touches LDS6005 C0 C1 • Shutdown mode (typical): <1 uW (VDD1=1.8V) Power-On Reset Logic Calibration Engine C2 C3 C9 VDD1 Calibration RAM VSS1 Flexible interface options • SPI-compatible serial I/F Sigma-Delta CDC Switch Matrix Ultra-low touch sensor power consumption* • Operating mode (typical): <150 uW (VDD1=1.8V) RESETB 2 • I C-compatible serial I/F • Separate VDDIO level for serial interface Control and Data Registers TEST • GPIO and Interrupt Output * Excludes I/F and voltage dependent VDDIO current VDDIO I/F SEL Serial Interface and Control Logic SD0/ SDA SDI/ A1 SCLK/ CSB/ SCL A0 Figure 1. LDS6005 block diagram IDT® LDS6005 PureTouch™ Capacitance Touch IC 1 Interrupt and GPIO Logic GPIO INTB 500 kHz Excitation Source SHIELD Flexible package options: • 28 pin 4mm x 4mm QFN, 0.8mm max height • 28 pin 5.3mm x 10.2mm SSOP, 1.83mm max height Power supply range: • Touch supply (VDD1): 1.65V - 1.95V • VDDIO=1.65V - 3.6V Applications: • Mobile handsets and smartphones Ideal solution for portable applications The LDS6005 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 LDS6005 may be operated continuously in full power mode, even when battery life is of premium importance. The low power architecture of the IDT PureTouch™ 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 LDS6005 may be put into standby mode, reducing typical power consumption below 1 uW. VDDIO (1.65V~3.6V) • Personal music and media players (MP3/MP4) • Gaming devices Host Processor with SPI LDS6005 • Remote controls • Television, audio/video • Set-top boxes SENSOR PCB SHIELD C0 C1 C2 C3 C4 C5 C6 C7 • Multi-function printers • Enterprise telephony C8 C9 VDDIO VDD I/F SEL VSS CSB SCLK SDI SDO INTB RESETB GPIO TEST SSB SCLK MOSI MISO INTB RESETB floating floating VDD1 (1.65V~1.95V) VDD1 C1 VSS1 C1: > 1uF Figure 2. LDS6005 application diagram Discover what IDT know-how can do for you. www.IDT.com/go/Touch ® © 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. Printed in USA 08-09/MG/BWD/PDF_r7_v1 FLYR-LDS6005-089