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SX8655IWLTRT Datasheet(PDF) 2 Page - Semtech Corporation |
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SX8655IWLTRT Datasheet(HTML) 2 Page - Semtech Corporation |
2 / 62 page ADVANCED COMMUNICATIONS & SENSING Rev 1 – 25 th July 2011 2 www.semtech.com SX8654/SX8655/SX8656 Haptics Enabled 4/5-Wire Resistive Touchscreen Controller with Proximity 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 |
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