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I/F_SEL1 SHIELD LED0- LED9 VSS2 VDD2 VSS1 Serial Interface and Control Logic Interrupt and GPIO Logic LDO Excitation Source Calibration RAM Control and Data Registers LDS6120 Power-On Reset Logic Calibration Engine CDC LDOEN I/F_SEL0 INTBGPIOCSB/ SCLK/ SCL SDI/ SD0/ SDA LED Driver Current Sources Sigma-Delta CDC Switch Matrix C1/DCM 11 C0/DCM10 C9/DCM9 C10/LED0 C19/LED9 LDS6100/6120 Touch Family PureTouch Capacitance Touch IC Family with Integrated LED Drivers The IDT LDS6100/6120 family of PureTouch® controllers empower 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
The LDS6100/6120 family of capacitance touch controllers from Integrated Device Technoogy® is optimized for the implementation of touch-based input controls including sliders, scroll wheels and buttons. A low power programmable capacitance-to-digital converter (CDC) supports up to 20 sensor inputs, 10 of which may be configured as direct communication mode (DCM) outputs that emulate mechanical buttons, enabling streamlined communication of touch events without the need to query the serial interface bus. When configured for capacitive sensing, the touch inputs are directed through an integrated switch matrix to a sigma-delta CDC which senses changes in the external sensor array. When a change in capacitance occurs above the user defined threshold, a touch event is recognized and the host processor is notified via an interrupt pin or DCM output. On the LDS6120 products, a variety of built-in LED lighting effects may be automatically initiated by a touch event with no processor intervention required. On-chip calibration logic continuously monitors the environment and automatically adjusts touch sensitivity to insure robust performance. Proprietary noise-filtering algorithms may also be activated to prevent false sensor activation in noisy system environments. The LDS6100/6120 family is offered with SPI-compatible, I 2C-compatible and SMBus-compatible interfaces, selectable in real-time using the I/F select pins. General-purpose input/output (GPIO) and interrupt outputs are also provided for additional communication with the host processor. IDT® LDS6100-6120 PURETOUCH® CAPACITANCE TOUCH FAMILY FLYER Benefits
- Ease-of-use and flexible configurability with optimized, state machine architecture
- Longer battery life enabled with ultra-low power consumption
- Low BOM cost and minimized solution footprint using bare minimum of external components
- Robust touch performance via proprietary noise-filtering algorithms
- Customizable visual f eedback effects with integrated LED drivers (LDS6120)
Applications
- Mobile handsets and smartphones
- Personal media players (MP3/MP4)
- Gaming devices
- Remote controls
- Television, audio/video
- Set-top boxes, multi-function printers, enterprise telephony
- White goods
- Industrial and medical devices
Figure 1. LDS6120 block diagram
below 25 μA (100ms sleep cycle). package for applications requiring a wider lead pitch. *For direct application of 1.8V voltage. For voltages higher than 1.8V, apply voltage to VDDIO and tie VDD1 to ground though C2. Figure 2. LDS6120 application diagram (typical)
- Configurable hysteresis and debounce Ultra-low touch sensor power consumption
- Full power operating mode (typical): <125 μW (VDD1=1.8V)
- Low power operating mode (typical): <50 μW (VDD1=1.8V, 100ms sleep cycle)
- Shutdown mode (typical): <1 μW (VDD1=1.8V) Integrated, automatic calibration algorithms
- Auto environmental compensation
- Integrated noise immunity algorithms for high-EMI applications Integrated touch preference modes • Strongest single touch / two touches
- Unrestricted (all) touches Built-in slider/scroll support • Location, scroll direction, and 2x interpolation supported natively
automatically trigger when a touch event occurs or manually controlled using the host processor.
- SPI, I2C, and SMBus-compatible serial I/F options
- DCM outputs for mec hanical switch emulation
- VDDIO level for serial interface
- GPIO and Interrupt Outputs Flexible package options
- 28 pin—4mm x 4mm QFN
- 40 pin—5mm x 5mm QFN
- 28 pin—5.3mm x 10.2mm SSOP Power supply range
- Touch supply (VDD1): 1.65V–5.5V *
- LED supply (VDD2): 3.0V–5.5V
- VDDIO = 1.65V–5.5V * Supply voltages > 1.95V are applied to VDDIO pin Feature Enhancements
Figure 3. The LDS 6100/6120 Touch Sensor family includes over 20 enhanced features
- Up to 10 dual-purpose sensor inputs configurable as LED drivers
- 7.75 mA maximum current per dri ver (drivers may be combined for higher current applications)
- Flexible dimming control
- Built-in blink, heartbeat effects
- Individual LED configurability
- Host-free synchronization with touc h events © 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 12-09/MG/TDA/PDF/r3v1 FL YR-TOUCHfam-129 Discover what IDT know-how can do for you. www.IDT .com/go/T ouch6100 You can depend on IDT Three decades of inventing the technology our markets demand gives IDT the knowledge base to supply our customers with low power, mixed signal semiconductor solutions that enhance the digital media experience. Our diverse and extensive product line, including timing, switching, interconnect, audio and display products empowers leading OEMs to pursue technological advances in communications, computing and consumer market applications with IDT engineers at their side. Service, support and innovation: that’s IDT.