SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING KEY PRODUCT FEATURES GENERAL DESCRIPTION Low Voltage Operation The SX8654, SX8655 and SX8656 belong to a family 2.3V to 3.6V Supply of high performance haptics enabled 4/5-wire Integrated Low Drop Out (LDO) Regulator resistive touch screen controller with proximity detection, optimized for hand held applications such Low Power Consumption as mobile phones, portable music players, game 30uA 2.3V 8ksps (ESR) machines, point-of-sales terminal and other 0.4uA Shut-Down Current consumer and industrial applications. They feature a 4/5-Wire Touchscreen Interface wide input supply range from 2.3V to 3.6V. Precision, Ratiometric 12-bit ADC The controller computes touch screen X-Y Up to 5000 (X-Y) coordinates/second (c/s) coordinates and touch pressure with a precision, low power 12-bit analog-digital converter. On-chip data Programmable Digital Filtering/Averaging averaging processing algorithms can be activated to Touch Pressure Measurement (4-Wire) reduce host activity and suppress system noise. The Programmable Operating Mode (Manual, processing core features low power modes which Pen Detect, Pen Trigger) intelligently minimize current in operation as well as in Capacitive Proximity Sensing (SX8654/56) automatic shut-down. No Additional Components Required A capacitive proximity detection circuit has been Uses Resistive Touchscreen or a Simple integrated into the SX8654 and SX8656 to enable Conductive Area as the Sensor host controlled power management for battery >5 cm Detection Distance applications. Proximity detection above 5 cm is 8uA 200ms Scan Period possible using either the resistive touch screen as the sensor or with a single conductive plate, with Fully Programmable (Sensitivity, etc) communication to the host via the serial interface. Haptics Driver for LRA and ERM (SX8654/55) The SX8654 and SX8655 also integrate a haptics Haptics Waveform Generation Control (I2C motor driver for Linear Resonant Actuator (LRA) and or PWM Input) Eccentric Rotating Mass (ERM) micro motors with up Short Circuit Protection to 250mA drive current. Haptics control can be Early Warning and Over-Temperature performed using either an external PWM signal or the Monitoring and Protection I2C serial interface, providing simple host interfacing 400kHz I2C Serial Interface and minimizing its I/O requirement. Several Host Operating Modes Available Integrated very high ESD protection, of up to 15kV on display inputs not only saves cost and board area, Maskable Interrupt Output (NIRQ) but also increases application reliability. Real-time Events Monitoring (AUX1-3) The three devices have an ambient operating Polling (I2C) temperature range of -40C to +85C, and are offere d Hardware, Software, and Power-On Reset in both a 4mm x 4mm, 20-lead QFN package and -40C to +85C Operating Temperature Range 2.07mm x 2.07mm 19-lead CSP package for space- 15kV HBM & IEC ESD Protection conscious applications. Small Footprint Packages TYPICAL APPLICATIONS Pb & Halogen Free, RoHS/WEEE compliant Game Machines, Portable Music Players Mobile Phones DSC, DVR, Phones M POS/POI Terminals Touch-Screen Monitors HAPTICS DRIVER ORDERING INFORMATION NRST Part Number Package Marking Host I2C SX8654IWLTRT QFN-20 SX8654 Controller CVBA NIRQ SX8654ICSTRT WLCSP-19 TOUCHSCREEN SX8655IWLTRT QFN-20 CONTROL RB2A SX8655ICSTRT WLCSP-19 SX8656IWLTRT QFN-20 RC95 SX8656ICSTRT WLCSP-19 SX8654EVK Evaluation Kit - PROXIMITY SENSING th Rev 1 25 July 2011 1 www.semtech.com SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING Table of Contents GENERAL DESCRIPTION..................................................................................................................... 1 TYPICAL APPLICATIONS ..................................................................................................................... 1 ORDERING INFORMATION................................................................................................................... 1 KEY PRODUCT FEATURES.................................................................................................................. 1 1 GENERAL DESCRIPTION ............................................................................................................ 4 1.1 Marking Information 4 1.1.1 SX8654 4 1.1.2 SX8655 4 1.1.3 SX8656 4 1.2 Pin Diagrams 5 1.2.1 QFN Package 5 1.2.2 CSP Package 5 1.3 Pin Description 6 1.4 Block Diagram 7 2 ELECTRICAL CHARACTERISTICS............................................................................................... 9 2.1 Absolute Maximum Ratings 9 2.2 Thermal Characteristics 9 2.3 Electrical Specifications 9 3 TYPICAL OPERATING CHARACTERISTICS ............................................................................... 12 4 TOUCHSCREEN INTERFACE..................................................................................................... 13 4.1 Introduction 13 4.2 Coordinates Measurement 14 4.2.1 4-wire Touchscreen 14 4.2.2 5-wire Touchscreen 15 4.3 Pressure Measurement (4-wire only) 15 4.3.1 Bias Time (POWDLY) 16 4.4 Pen Detection 16 4.5 Digital Processing 17 4.6 Host Operation 19 4.6.1 Overview 19 4.6.2 Manual Mode (MAN) 19 4.6.3 Pen Detect Mode (PENDET) 20 4.6.4 Pen Trigger Mode (PENTRG) 20 4.6.5 Maximum Throughput vs. TOUCHRATE setting 21 5 PROXIMITY SENSING INTERFACE (SX8654/56) ....................................................................... 23 5.1 Introduction 23 5.2 Analog Front-End (AFE) 24 5.2.1 Capacitive Sensing Basics 24 5.2.2 AFE Block Diagram 25 5.2.3 Capacitance-to-Voltage Conversion (C-to-V) 26 5.2.4 Shield Control 26 5.2.5 Offset Compensation 26 5.2.6 Analog-to-Digital Conversion (ADC) 27 5.3 Digital Processing 27 5.3.1 Overview 27 5.3.2 PROXRAW Update 28 5.3.3 PROXUSEFUL Update 29 5.3.4 PROXAVG Update 30 th Rev 1 25 July 2011 2 www.semtech.com