Design Guide SEMTECH ADVANCED COMMUNICATIONS & SENSING Touch-Interface Design Guide Semtech adds proximity to its 4D-Touch family of Capacitive and Resistive Touch Platforms Mobile LCD TVs Portable Navigation Control Panels Feature Keys: Multi-touch Low Power Robust ESD Protection Small Footprint Proximity Extreme Sensitivity Smart Auto Calibration Analog Haptic Driver LED Driver Analog Output W W W .SE MTE C H .C OM Touch-Interface Products World’s Lowest Power Resistive Touchscreen Controller with +/-15kV ESD Protection and Multi-touch Semtech’s ultra low power, resistive touchscreen controller family, provides the best-in-class on-chip ESD protection as well as multi-touch capability on a resistive panel. An extremely small footprint makes these controllers ideal for portable applications where power consumption and board-space are at a premium. The SX8651/53 also enables various multi-touch gestures such as pinch, stretch and rotation on a regular 4-wire analog resistive touchscreen. VDD Control 4-wire touchscreen NIRQ AUX/WIPER SPI Y+/TR Y-/BL X+/BR Touch Screen Interface Vref NCS OSC ref+ in ADC out ref- INT NRST (DFN only) POR X-/TL HOST SCLK Digital Filter DOUT DIN DIO CS SCLK MISO SPI Interface SX8653 VDD MOSI (x1, y1, x2, y2) GND Figure 5. SX8653 with a 4-wire touch screen Applications: • • • • • • • • Portable Navigation Device Automotive Center Console* Digital Photo Frame DSC Digital Video Camera Handheld Games Mobile POS Terminals Zoom Out Zoom In * AEC-Q100 Certified Rotate Right Rotate Left W W W .SE MTE C H .C OM -2- Touch-Interface Products Product Highlights: SX8651 4-wire 12-bit I2C 0.4µA SX8652 4/5-wire 12-bit SPI 0.4µA SX8653 4/5-wire 12-bit SPI 0.4µA ±25kV Air ±15kV Contact ±25kV Air ±15kV Contact ±25kV Air ±15kV Contact ±25kV Air ±15kV Contact ü ü ü ü ü ü ü ü Package 0.4µA Multi-touch I2C Programmable Settling Time Power Consumption 12-bit Digital Filter Interface 4-wire On-chip ESD Protection Resolution SX8650 Touch Panel n Extremely low power consumption optimized for battery-powered devices • 0.4µA @ 1.8V (Standby) • 23µA @ 1.8V (8ksps) n Best-in-Class on-chip ESD protection: Eliminates the needs for external components • ±25kV Air Gap Discharge • ±15kV Contact Discharge • ±15kV HBM • ±2kV CDM • ±300V MM n Equivalent throughput up to 50ksps n Enable multi-touch gestures with low cost 4-wire analog resistive touch panel n Built-in programmable settling time and digital filter reduces host processing overhead and bus loading n Ultra small footprint • 1.46 x 1.96mm 12-WLCSP • 3.0 x 3.0mm 12-DFN • 4.0 x 3.0mm 14-DFN 1.46x1.96mm WLCSP 3.0x3.0mm DFN ü 1.46x1.96mm WLCSP 3.0x3.0mm DFN 1.46x1.96mm WLCSP 4.0x3.0mm DFN ü 1.46x1.96mm WLCSP 4.0x3.0mm DFN W W W .SE MTE C H .C OM -3- Touch-Interface Products World’s First Haptics Enabled ±15kV ESD Resistive Touchscreen Controller with Proximity Sensing and Multi-touch These fully integrated, haptics enabled resistive touchscreen controllers feature an unique built-in proximity sensing circuitry which enables proximity detection in applications where automatic system wake up or backlight LED dimming adjustments are required without the need for any additional components. The SX865x family can directly connect to an ERM or LRA Motor to create haptic feedback, thus eliminating the need for a dedicated µC interface. The SX867x family also supports various multi-touch gestures such as pinch, stretch and rotation on a regular 4-wire analog resistive touchscreen. SX8654 VDD POR GND VREG X+/BR Y+/TR Resistive Touchscreen LDO MVDD 32K & 1.8 MHz OSC HAPTICS INTERFACE MIN ADDR CTRL AUX1/WIPER ANALOG SENSING 12 Bit ADC CMOUT RPULL x4 NRST PROX Y-/BL MOUTP MOUTN TEMP SENSOR TOUCHSCREEN / PROXIMITY SENSING INTERFACE X-/TL M MGND HOST I/F HOST NIRQ SCL SDA DIGITAL PROCESSING AUX2 AUX3 Applications: • • • • • • • • Portable Navigation Device Automotive Center Console* Digital Photo Frame DSC Digital Video Camera Handheld Games Mobile POS Terminals Haptic Interface: MVDD MGND I2C MIN Analog Processing 2 Digital Processing MOUTP VMOUT DAC ERM OR MOUTN SX8674/75 LRA * AEC-Q100 Certified W W W .SE MTE C H .C OM -4- Touch-Interface Products Product Highlights: 4/5-wire 12-bit I2C 0.4µA SX8656 4/5-wire 12-bit I2C 0.4µA SX8657 4/5-wire 12-bit I2C 0.4µA SX8658 4/5-wire 12-bit I2C 0.4µA SX8674 4/5-wire 12-bit I2C 0.4µA SX8675 4/5-wire 12-bit I2C 0.4µA SX8676 4/5-wire 12-bit I2C 0.4µA SX8677 4/5-wire 12-bit I2C 0.4µA SX8678 4/5-wire 12-bit I2C 0.4µA ±15kV Contact ±25kV Air ±15kV Contact ±25kV Air ±15kV Contact ±25kV Air ±15kV Contact ±25kV Air ±15kV Contact ±25kV Air ±15kV Contact ±25kV Air ±15kV Contact ±25kV Air ±15kV Contact ±25kV Air ±15kV Contact ±25kV Air ±15kV Contact ü Generic ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü Generic 2.07x2.07mm WLCSP 4.0x4.0mm QFN 2.07x2.07mm WLCSP 4.0x4.0mm QFN 2.07x2.07mm WLCSP 4.0x4.0mm QFN Immersion Immersion ü Package SX8655 ±25kV Air Haptics 0.4µA Proximity Sensing I2C Multi-touch Power Consumption 12-bit Programmable Settling Time Interface 4/5-wire n Built-in proximity sensing with any resistive panel (>5cm) • Automatic system/display wake up • Touch panel control (IR replacement) n Integrated haptics motor control (LRA & ERM) n Enable multi-touch with low cost 4-wire touch panel n Fully compatible with most 4-wire/5-wire resistive touchscreen n Ultra small footprint • 2.07 x 2.07mm 19-WLCSP • 4.0 x 4.0mm 20-QFN Digital Filter Resolution SX8654 On-chip ESD Protection Touch Panel n Extremely low power consumption optimized for battery-powered devices • 0.4µA @ 2.3V (Standby) • 30µA @ 2.3V (8ksps) n Best-in-Class on-chip ESD protection: Eliminates the needs for external components • ±25kV Air Gap Discharge • ±15kV Contact Discharge • ±15kV HBM • ±2kV CDM • ±300V MM Generic Generic 2.07x2.07mm WLCSP 4.0x4.0mm QFN 2.07x2.07mm WLCSP 4.0x4.0mm QFN 2.07x2.07mm WLCSP 4.0x4.0mm QFN 2.07x2.07mm WLCSP 4.0x4.0mm QFN 2.07x2.07mm WLCSP 4.0x4.0mm QFN Immersion Immersion 2.07x2.07mm WLCSP 4.0x4.0mm QFN 2.07x2.07mm WLCSP 4.0x4.0mm QFN W W W .SE MTE C H .C OM -5- Touch-Interface Products World’s Lowest Power, Fully Integrated Capacitive Touch Sensors with Enhanced LED Drivers and Proximity Sensing The superior sensitivity of the SX863x/4x touch sensor platform enables sensing through a thick overlay material as well as proximity detection with an extended range (>10cm) all in a tiny footprint with zero components per input. The low power consumption and advanced, built-in LED drivers make it the ideal solution for a wide range of sensing applications in mobile phone, media players, notebooks and white goods. Vdig Proximity Cap0 RC Clock Generation Cap2 GPIO0 Power Management and RESET Cap5 Cap6 GPIO1 GPIO2 Cap3 Cap4 Analog Front End and Sensor Interface GPIO3 PWM LED Controller 10 Bit ADC GPIO4 Micro Processor GPIO / LED Interface Cap7 Touch Wheel +V SX863x Cap1 Buttons Vana Vdd Resetb Cap8 GPIO5 GPIO6 GPIO7 RAM NVM ROM I2C Interface Cap9 Enter Cap10 Slider Cap11 Prox Sensor >>>>> Applications: • • • • • • • • Plug & Play Functionality CP CN GND x3 SCL SDA Intb LCD Monitors Appliances Printers Automotive Radio Console* Personall Media Players Set Top Box (STBs) Game Consoles Industrial Systems * AEC-Q100 Certified W W W .SE MTE C H .C OM -6- Touch-Interface Products Product Highlights: ü 8 ü ü 8 I2C ü ü 8 I2C ü ü 8 I2C ü 8 I2C ü ü 8 8 8 12 12 SX8645 12 8 I2C SX8646 8 8 I2C SX8647 8 8 I2C 8 I2C ü 8 I2C ü SX8648 SX8649 8 8 ü ü ü ü ü ü ü ü ü Footprint ü I2C Field Programmable 8 12 ü Auto Lightening ü Fade-in/out ü I2C Intensity (256-step) 8 12 Wheel ü Slider ü I2C Auto Compensation SX8644 I2C Overlay SX8643 8 Power @ 195ms SX8639 12 n Enhanced LED operation • Individual 256-step intensity/Fade-in/ Fade-out control • Auto-lightening without host interaction n No external components per input n Ultra small footprint • 4.0 x 4.0mm 28-QFN • 5.0 x 5.0mm 32-QFN Min. Scan Time SX8638 Button SX8636 Proximity SX8635 Interface SX8634 LED Driver (12 mA) SX8633 Sensor Inputs n High resolution capacitive sensing solution • Proximity detection up to 10cm • Supports button, slider and wheel design n Extreme sensitivity: • Works with thick overlay materials (>5mm) n Extremely low power with programmable scan time • 70µA (typ) @ 195ms n Smart auto-offset compensation • Eliminates false triggers due to environmental factors 15ms 80µA >5mm ü Lin./Log. ü ü ü 5x5mm 15ms 80µA >5mm ü Lin./Log. ü ü ü 5x5mm 15ms 80µA >5mm ü Lin./Log. ü ü ü 5x5mm 15ms 70µA >5mm ü Lin./Log. ü ü ü 4x4mm 15ms 70µA >5mm ü Lin./Log. ü ü ü 4x4mm 15ms 70µA >5mm ü Lin./Log. ü ü ü 4x4mm 15ms 80µA >5mm ü Lin./Log. ü ü ü 5x5mm 15ms 80µA >5mm ü Lin./Log. ü ü ü 5x5mm 15ms 80µA >5mm ü Lin./Log. ü ü ü 5x5mm 15ms 70µA >5mm ü Lin./Log. ü ü ü 4x4mm 15ms 70µA >5mm ü Lin./Log. ü ü ü 4x4mm 15ms 70µA >5mm ü Lin./Log. ü ü ü 4x4mm 15ms 70µA >5mm ü Lin./Log. ü ü ü 4x4mm W W W .SE MTE C H .C OM -7- Touch-Interface Products World’s Lowest Power, Capacitive Touch Button and Proximity Solution with Advanced LED Drivers and Analog Output Interface This ultra low power capacitive touch family features a special Analog Output Interface for legacy TV system architecture and provides superior sensitivity for different touch button control designs. With advanced LED drivers for enhanced visual feedback and long range proximity sensing, the SX8660/61 family are the ideal choice for LCD TV Capacitive button applications. Vdig Vana Vdd Resetb Proximity Cap0 RC Clock Generation Cap1 Buttons +V SX8661 GPIO0 Power Management and RESET GPIO2 Cap2 Cap3 Cap4 GPIO1 Analog Front End and Sensor Interface Cap5 GPIO3 PWM LED Controller 10 Bit ADC GPIO4 Micro Processor GPIO / LED / AOI Buzzer Interface Cap6 GPIO5 GPIO6 GPIO7 Cap7 RAM NVM BUZZER AOI - B AOI - A 2 1 0 ||||| | Prox Sensor ROM Input CP CN GND x3 Plug & Play Functionality I2C Interface SCL SDA |||| |||||||||||||||||| V ||| 3 ||| Intb Applications: • Flat Panel TVs • LCD Monitors • Mechanical Button Replacement W W W .SE MTE C H .C OM -8- Touch-Interface Products Analog Product Highlights: Intensity (256-step) Fade-in/out Auto Lightening Field Programmable Footprint ü Auto Compensation 8 Overlay 8 I2C/Analog Power @ 195ms I2C/Analog Min. Scan Time 8 n Smart auto-offset compensation • Eliminates false triggers due to environmental factors n Advanced LED drivers • Individual 256-step intensity/Fade-in/ Fade-out control • Continuous breathing mode • Auto-lightening without host interaction n Support of buzzer for audible feedback n No external components per input n Ultra small footprint • 4.0 x 4.0mm 28-QFN Button 8 Proximity Interface SX8661 LED Driver (12 mA) SX8660 Sensor Inputs n High resolution capacitive sensing solution • Proximity detection up to 10cm • Supports button design n Up to 2 analog output interfaces • Enable button reporting thru host’s ADC n Versatile button reporting configuration • Advanced channel filtering responds to the strongest touch n Extreme sensitivity: • Works with thick>5mm overlay materials n Extremely low power with programmable scan time • 70µA (typ) @ 195ms ü 15ms 70µA >5mm ü Lin./Log. ü ü ü 4x4mm ü 15ms 70µA >5mm ü Lin./Log. ü ü ü 4x4mm W W W .SE MTE C H .C OM -9- Touch-Interface Products Semtech Debuts Touchscreen Controller Platform with Lowest Power, Smallest Footprint and ±15kV ESD Protection The SX8650 is the first in a new platform of touchscreen controllers and is optimized for power (23µA), size (1.46mm x 1.96mm), and ESD protection. These features make it the most application-specific resistive touchscreen controller on the market for such applications as mobile phones, digital still cameras, MP3 players, PDAs, personal navigation devices, and handheld gaming devices. Semtech Debuts World’s Lowest Power, Fully Integrated Capacitive Touch Sensor IC Platform The capacitive analog interface on each of the seven ICs in the SX864x platform is designed with a highly accurate ADC that provides superior sensitivity to work with overlay materials more than 5mm thick, offering extremely robust and ESD-immune system design. With current consumption as little as 80µA at operation, these ICs are the ideal choice for battery-powered devices. This SX864x platform also integrates eight, 256-step LED drivers with individual intensity and linear and logarithmic fading control that is optimized for human vision. Semtech Expands Ultra-Low Power, Resistive Touchscreen Controller Platform with 5-Wire, SPI Interface Device The SX8652 is one of a new generation of touchscreen controllers that are optimized for low-power consumption (23µA), small size (1.46mm x 1.96mm chipscale package), and high electrostatic discharge (ESD) protection (±15kV). These features make the SX8652 the most application-specific resistive touchscreen controller on the market for applications including PDAs, digital still cameras, point-of-sales terminals, printers and other portable touchscreen monitor devices. Semtech Adds World’s Most Sensitive Proximity Function to Leading Capacitive Touchbutton Platform The new SX863x capacitive touch button controllers come in 8- and 12-channel versions and feature a long range of proximity detection of 10cm (view SX863x proximity detection range video clip), allowing the sensor to control powermanagement and other convenience features such as system wake-up, LED wakeup and automatic backlight activation upon user detection. W W W .SE MTE C H .C OM - 10 - Touch-Interface Products SX8660/61 Semtech Easy-to-Use Proximity Capacitive Touch Sensor Platform is Optimized for TV Applications The 8-channel SX8660/61 touch sensor platform features integrated LED drivers and an extended, 10cm range of proximity sensing. It is designed to easily replace legacy mechanical button controllers with an analog output interface (AOI) that supports the use of a buzzer for audible feedback making the platform fully compatible with a wide range of television designs. SX8654/55/56/57/58 Resistive Touchscreen Controllers The SX8654/55/56/57/58 features a highly accurate 12-bit Analog-to-Digital converter for coordinates and touch pressure measurement with current consumption as little as 30µA at 8ksps rate. These resistive touchscreen controllers can also support a proximity detection distance of > 5cm using ANY standard 4/5-wire resistive panel, enabling various power-saving features such as automatic backlight activation or system wake-up. These devices also incorporate a haptics motor driver for controlling Linear Resonant Actuator (LRA) and Eccentric Rotating Mass (ERM) micro motors (up to 250mA) while providing acknowledgement to touch events, thus emulating the tactile feedback similar to mechanical keys which enhance the overall user experience. SX8674/75/76/77/78 Resistive Touchscreen Controllers The new SX867x family is a fully integrated resistive touchscreen platform which incorporates various innovative high end features such as multi-touch gesture support for 4-wire touchscreen, proximity detection distance of >5cm with zero external component and an advanced haptics driver for controlling Linear Resonant Actuator (LRA) and Eccentric Rotating Mass (ERM) micro motors all packed in a very tiny 2.07x2.07mm footprint. With current consumption as low as 30µA at operation (0.4µA at standby) and a robust built-in ESD protection that can withstand an ESD event up to +/-15kV, these controllers are the ideal solution for a wide variety of touchscreen applications. W W W .SE MTE C H .C OM - 11 - Touch-Interface Products Wireless RF and Sensing Products Southampton, England San Jose,CA Courtaboeuf, France Irvine,CA Camarillo,CA Hallbergmoos, Germany St. Gallen, Switzerland Raleigh, North Carolina Seoul, Korea Beijing, China Neuchatel, Switzerland Redondo Beach,CA San Diego,CA Design & Application Center and Sales Office Sales/Support Offices Tokyo, Japan Shanghai, China Osaka, Japan Shenzhen, China Reynosa, Mexico Taiwan Manila, Philippines Ipoh, Malaysia North America Europe Asia Corporate Headquarters Camarillo, California 805 498 2111 Neuchatel, Switzerland Design Center & Applications + 41 32 729 4000 Seoul, Korea + 82 2 527 4377 San Diego, California Design Center & Applications 858 613 3320 St. Gallen, Switzerland + 41 71 313 4828 San Jose, California Design Center & Applications 408 324 3300 Redondo Beach, California Design Center & Applications 310 698 1000 Irvine, California Design Center & Applications 949 269 4400 Raleigh, North Carolina Design Center & Applications 919 465 6430 Southampton, England Design Center & Applications + 44 1794527 600 Courtaboeuf , France + 33 169 28 22 00 Hallbergmoos, Germany + 49 811 998 728 10 Tokyo, Japan + 81 3 6408 0950 Osaka, Japan + 81 6 6133 5608 Beijing, China + 86 10 6410 6855 Shanghai, China + 86 21 6391 0830 Shenzhen, China Design Center & Applications + 86 755 8282 8515 Taipei, Taiwan + 886 2 2748 3380 Manila, Philippines + 63 2772 1834 Ipoh, Malaysia + 60 5312 3333 Semtech and the Semtech logo are registered marks of Semtech Corporation. All other trademarks and trade names mentioned may be marks and names of their respective companies. Semtech reserves the right to make changes to, or discontinue any products described in this document without further notice. Semtech makes no warranty, representation or guarantee, express or implied, regarding the suitability of its products for any particular purpose. ©2011 Semtech Corporation. All rights reserved. 4DtouchDG-0811 W W W .SE MTE C H .C OM - 12 -