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SX8643 Datasheet(PDF) 2 Page - Semtech Corporation |
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SX8643 Datasheet(HTML) 2 Page - Semtech Corporation |
2 / 68 page ADVANCED COMMUNICATIONS & SENSING DATASHEET Revision 7_5, February 10 © 2010 Semtech Corp. www.semtech.com 2 SX8643 Ultra Low Power, Capacitive Button Touch Controller (12 sensors) with Enhanced LED Drivers Table of Contents GENERAL DESCRIPTION........................................................................................................................ 1 TYPICAL APPLICATION CIRCUIT ............................................................................................................ 1 KEY PRODUCT FEATURES..................................................................................................................... 1 APPLICATIONS....................................................................................................................................... 1 ORDERING INFORMATION...................................................................................................................... 1 1 GENERAL DESCRIPTION............................................................................................................... 4 1.1 Pin Diagram 4 1.2 Marking information 4 1.3 Pin Description 5 1.4 Simplified Block Diagram 6 1.5 Acronyms 6 2 ELECTRICAL CHARACTERISTICS ................................................................................................. 7 2.1 Absolute Maximum Ratings 7 2.2 Recommended Operating Conditions 7 2.3 Thermal Characteristics 7 2.4 Electrical Specifications 8 3 FUNCTIONAL DESCRIPTION........................................................................................................ 10 3.1 Quickstart Application 10 3.2 Introduction 10 3.2.1 General 10 3.2.2 GPIOs 11 3.2.3 Parameters 11 3.2.4 Configuration 11 3.3 Scan Period 12 3.4 Operation modes 12 3.5 Sensors on the PCB 14 3.6 Button Information 14 3.6.1 Button Information 14 3.7 Analog Sensing Interface 14 3.8 Offset Compensation 15 3.9 Processing 17 3.10 Configuration 17 3.11 Power Management 19 3.12 Clock Circuitry 19 3.13 I2C interface 19 3.14 Reset 20 3.14.1 Power up 20 3.14.2 RESETB 20 3.14.3 Software Reset 21 3.15 Interrupt 22 3.15.1 Power up 22 3.15.2 Assertion 22 3.15.3 Clearing 22 3.15.4 Example 23 |
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