1 lds6025 puretouch? capacitance touch ic with integrated keypad led drivers 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. featuring 10 sensor inputs, 5 of which are dual-purpose i/os con?gurable as either capacitive sensor inputs or keypad led drivers, the lds6025 provides the ?exibility to implement multiple touch inputs with integrated lighting effects using a single controller. when con?gured 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 suf?ciently large change in capacitance occurs, a sensor activiation is registered and the host processor is noti?ed. led lighting effects are automatically initiated by a touch event with no processor intervention required. on-chip calibration logic continuously monitors the environment and auto - matically adjusts on-and-off threshold levels to prevent false sensor activa - tion. the lds6025 is offered with both spi-compatible and i 2 c-compatible inter - faces (active interface selected by i/f select pin) and features a general- purpose input/output (gpio) and interrupt output for additional communica - tion with the host processor. lds6025 features versatile, accurate capacitance- to-digital converter (cdc) ? 500khz sigma-delta cdc ? 10 capacitance sensor input channels ? 2ms update rate per active sensor integrated keypad led drivers ? c5-c9 sensor inputs con?gu - rable as keypad led drivers ? 7.75ma maximum driving current (up to 39ma avail - able by connecting multiple outputs to a single led) ? flexible dimming control ? processor-free synchroniza - tion with touch events integrated, automatic calibration algorithms ? environmental compensation ? on-chip ram to store calibration data integrated touch prefer - ence modes ? strongest single touch ? strongest two touches ? unrestricted (all) touches ultra-low touch sensor power consumption* ? operating mode (typical): <150uw (vdd1=1.8v) ? shutdown mode (typical): <1uw (vdd1=1.8v) product brief lds6025 lds6025 block diagram sight sound touch * excludes led driver current and i/f and voltage dependent v ddio current
lds6025 5/09- rev 1.1 ? 2009 leadis technology, inc. all rights reserved. the leadis logo is a trademark of leadis technology, inc. other product names are registered trademarks of their respective companies. product speci?cations are subject to change at any time without notice. leadis assumes no responsibility for errors or omissions. leadis assumes no liability(including liability for damages) with respect to any use of or reliance on the information contained herein. flexible interface options ? spi-compatible serial i/f ? i 2 c-compatible serial i/f ? separate v ddio level for serial interface ? gpio and interrupt output flexible package options: ? 28 pin 4mm x 4mm qfn, 0.8mm max height ? 28 pin 5.3mm x 10.2mm ssop, 1.99mm max height power supply range: ? touch supply (vdd1): 1.65v - 1.95v ? led supply (vdd2): 3.0v - 5.5v ? v ddio =1.65v - 3.6v applications: ? mobile handsets and smartphones ? personal music and media players (mp3/mp4) ? gaming devices ? remote controls ? television, a/v ? set-top boxes ? multi-function printers ? enterprise telephony leadis technology, inc. 800 w. california avenue, suite 200 sunnyvale, california 94086 tel: +1.408.331.8600 fax: +1.408.331.8601 www.leadis.com the lds6025 features integrated keypad led drivers enabling the imple - mentation 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. the lds6025 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 continously, minimizing the time between touch event and touch detection. with its ultra-low touch sensor power consumption of <150uw (typical), the lds6025 may be operated continously 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 funtionality of multiple components consolidated into a single device. with integrated keypad led driver functionality, the lds6025 is a ?exible solution combining the functionality of two discrete ics into a compact 4mm x 4mm tqfn package with 0.75mm package thickness (ssop package also available). integrated keypad led drivers ideal solution for portable applications lds6025 application diagram
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