SX8657/SX8658 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing ADVANCED COMMUNICATIONS & SENSING KEY PRODUCT FEATURES GENERAL DESCRIPTION Low Voltage Operation The SX8657 and SX8658 belong to a family of high 2.3V to 3.6V Supply performance haptics enabled 4/5-wire resistive touch Integrated Low Drop Out (LDO) Regulator screen controller with proximity detection, optimized for hand held applications such as mobile phones, Low Power Consumption portable music players, game machines, point-of- 30uA 2.3V 8ksps (ESR) sales terminal and other consumer and industrial 0.4uA Shut-Down Current applications. They feature a wide input supply range 4/5-Wire Touchscreen Interface 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 (SX8657) automatic shut-down. No Additional Components Required A capacitive proximity detection circuit has been Uses Resistive Touchscreen or a Simple integrated into the SX8657 to enable host controlled Conductive Area as the Sensor power management for battery applications. Proximity >5 cm Detection Distance detection above 5 cm is possible using either the 8uA 200ms Scan Period resistive touch screen as the sensor or with a single conductive plate, with communication to the host via Fully Programmable (Sensitivity, etc) the serial interface. Haptics Driver for LRA and ERM (SX8657/58) The SX8657 and SX8658 also integrate a haptics Supports Immersion TouchSense 3000 motor driver for Linear Resonant Actuator (LRA) and haptic control software Eccentric Rotating Mass (ERM) micro motors with up Haptics Waveform Generation Control (I2C to 250mA drive current. Haptics control can be or PWM Input) performed using either an external PWM signal or the Short Circuit Protection I2C serial interface, providing simple host interfacing Early Warning and Over-Temperature and minimizing its I/O requirement. The SX8657/58 Monitoring and Protection supports Immersion TouchSense 3000 haptic control software for high quality touch feedback. 400kHz I2C Serial Interface 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- conscious applications. 15kV HBM & IEC ESD Protection Small Footprint Packages TYPICAL APPLICATIONS Pb & Halogen Free, RoHS/WEEE compliant Game Machines, Portable Music Players Mobile Phones M DSC, DVR, Phones POS/POI Terminals HAPTICS DRIVER Touch-Screen Monitors NRST ORDERING INFORMATION Host I2C SX8657 Part Number Package Marking Controller NIRQ SX8657IWLTRT QFN-20 RD2C TOUCHSCREEN SX8657ICSTRT WLCSP-19 CONTROL SX8658IWLTRT QFN-20 RC4B SX8658ICSTRT WLCSP-19 SX8654EVK Evaluation Kit - PROXIMITY SENSING th Rev 1 25 July 2011 1 www.semtech.com SX8657/SX8658 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 SX8657 4 1.1.2 SX8658 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 6 2 ELECTRICAL CHARACTERISTICS............................................................................................... 8 2.1 Absolute Maximum Ratings 8 2.2 Thermal Characteristics 8 2.3 Electrical Specifications 8 3 TYPICAL OPERATING CHARACTERISTICS ............................................................................... 11 4 TOUCHSCREEN INTERFACE..................................................................................................... 12 4.1 Introduction 12 4.2 Coordinates Measurement 13 4.2.1 4-wire Touchscreen 13 4.2.2 5-wire Touchscreen 14 4.3 Pressure Measurement (4-wire only) 14 4.3.1 Bias Time (POWDLY) 15 4.4 Pen Detection 15 4.5 Digital Processing 16 4.6 Host Operation 18 4.6.1 Overview 18 4.6.2 Manual Mode (MAN) 18 4.6.3 Pen Detect Mode (PENDET) 19 4.6.4 Pen Trigger Mode (PENTRG) 19 4.6.5 Maximum Throughput vs. TOUCHRATE setting 20 5 PROXIMITY SENSING INTERFACE (SX8657) ............................................................................ 22 5.1 Introduction 22 5.2 Analog Front-End (AFE) 23 5.2.1 Capacitive Sensing Basics 23 5.2.2 AFE Block Diagram 24 5.2.3 Capacitance-to-Voltage Conversion (C-to-V) 25 5.2.4 Shield Control 25 5.2.5 Offset Compensation 25 5.2.6 Analog-to-Digital Conversion (ADC) 26 5.3 Digital Processing 26 5.3.1 Overview 26 5.3.2 PROXRAW Update 27 5.3.3 PROXUSEFUL Update 28 5.3.4 PROXAVG Update 29 5.3.5 PROXDIFF Update 31 th Rev 1 25 July 2011 2 www.semtech.com