Switch Matrix semiconductor solutions LDS6025 PureTouch Capacitance Touch IC with Integrated Keypad LED Drivers The LDS6025 PureTouch 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. Description LDS6025 Features The LDS6025 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. Versatile, accurate capacitance- Featuring 10 sensor inputs, 5 of which are dual-purpose I/Os configurable as either capacitive sensor to-digital converter (CDC) inputs or keypad LED drivers, the LDS6025 provides the flexibility to implement multiple touch inputs with 500 kHz sigma-delta CDC integrated lighting effects using a single controller. 10 capacitance sensor input channels 2 ms update rate per active sensor 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 Integrated keypad LED drivers change in capacitance occurs, a sensor activation is registered and the host processor is notified. LED C5-C9 sensor inputs configurable lighting effects are automatically initiated by a touch event with no processor intervention required. as keypad LED drivers 7.75 mA maximum driving cur rent On-chip calibration logic continuously monitors the environment and automatically adjusts on-and-off (up to 39 mA available by connecting threshold levels to prevent false sensor activation. The LDS6025 is offered with both SPI-compatible and multiple outputs to a single LED) 2 I C-compatible interfaces (active interface selected by I/F select pin) and features a general-purpose input/ Flexible dimming control output (GPIO) and interrupt output for additional communication with the host processor. Processor-free synchronization with touch events Integrated, automatic LDS6025 C0 calibration algorithms C1 En vironmental compensation Power-On Calibration Sigma-Delta On-chip RAM to store calibration data Reset Logic Engine CDC C4 C5/LED0 Integrated touch preference modes Strongest single touch VDD1 C9/LED4 LED0- LED4 Strongest tw o touches LED Driver Calibration Current Sources VSS1 VDD2 RAM Unrestricted (all) touches VSS2 RESETB Ultra-low touch sensor power consumption* Control and TEST Operating mode (typical): Data Registers <150 uW (VDD1=1.8V) Shutdown mode (typical): <1 uW (VDD1=1.8V) 500 kHz Excitation SHIELD VDDIO Serial Interface and Interrupt and GPIO Logic Source Control Logic I/F SEL * Exc ludes LED driver current and I/F and voltage dependent V current DDIO SD0/ SDI/ SCLK/ CSB/ GPIO INTB SDA A1 SCL A0 IDT LDS6025 PurET OuCH CaP aCITanCE T OuCH IC Figure 1. LDS6025 block diagram 1Integrated keypad LED drivers Flexible interface options The LDS6025 features integrated keypad LED drivers enabling the implementation of visual feedback for SPI-compatible serial I/F touch-based controls and fun lighting effects. The keypad LEDs may be powered either from Vbattery 2 I C-compatible serial I/F directly or from a regulated voltage supply. On/off transition times are programmed globally for all LEDs Separate V level for serial interface DDIO and maximum current may be programmed for each LED individually. LEDs may be either manually GPIO and Inter rupt Output controlled or synchronized to automatically trigger when a touch event occurs. Flexible package options Ideal solution for portable applications 28 pin 4mm x 4mm QFN, The LDS6025 is optimized for minimal power consumption, with touch sensor circuits operating from 0.8mm max height a 1.8V supply voltage. In full power mode, sensor conversion and calibration occur continuously, 28 pin 5.3mm x 10.2mm SSOP, minimizing the time between touch event and touch detection. With its ultra-low touch sensor power 1.83mm max height consumption of <150 uW (typical), the LDS6025 may be operated continuously in full power mode, eliminating the need for introduced latencies that can cause noticeable delays and degrade the Power supply range user experience. Touch supply (VDD1): 1.65V - 1.95V LED supply (VDD2): 3.0V - 5.5V The total solution footprint is also optimized for portable applications, with the functionality of multiple V =1.65V - 3.6V DDIO components consolidated into a single device. With integrated keypad LED driver functionality, the LDS6025 is a flexible solution combining the functionality of two discrete ICs into a compact 4mm x 4mm Applications TQFN package with 0.75mm package thickness (SSOP package also available). Mobile handsets and smar tphones SENSOR Personal music and media pla yers PCB (MP3/MP4) VDDIO (1.65V~3.6V) Gaming devices Remote controls Television, audio/video LDS6025 Host Processor with SPI Set-top boxes VDDIO VDD SHIELD I/F SEL VSS Multi-function printers Enterprise telephony C0 CSB SSB C1 SCLK SCLK C2 SDI MOSI C3 SDO MISO C4 INTB INTB C5/LED0 RESETB RESETB C6/LED1 floating GPIO floating TEST0-1 C7/LED2 C8/LED3 floating C9/LED4 LED0-LED3 VDD2 (3.0V~5.5V) VDD1 (1.65V~1.95V) VDD1 VDD2 C2 C1 VSS1 VSS2 C1=C2: > 1uF Figure 2. LDS6025 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-LDS6025-089