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SX9500 Dataheets PDF



Part Number SX9500
Manufacturers Semtech
Logo Semtech
Description Four Channels Capacitive Proximity / Button Solution
Datasheet SX9500 DatasheetSX9500 Datasheet (PDF)

WIRELESS & SENSING SX9500 Ultra Low Power, Four Channels Capacitive Proximity/Button Solution GENERAL DESCRIPTION The SX9500 is a low-cost, very low power 4-channel capacitive controller that can operate either as a proximity or button sensor. The SX9500 includes sophisticated on-chip auto-calibration circuitry to regularly perform sensitivity adjustments, maintaining peak performance over a wide variation of temperature, humidity and noise environments, providing simplified product developmen.

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WIRELESS & SENSING SX9500 Ultra Low Power, Four Channels Capacitive Proximity/Button Solution GENERAL DESCRIPTION The SX9500 is a low-cost, very low power 4-channel capacitive controller that can operate either as a proximity or button sensor. The SX9500 includes sophisticated on-chip auto-calibration circuitry to regularly perform sensitivity adjustments, maintaining peak performance over a wide variation of temperature, humidity and noise environments, providing simplified product development and enhanced performance. The SX9500 operates directly from an input supply voltage of 2.7 to 5.5V, and includes a separate I2C serial bus supply input to enable communication with 1.8 – 5.5V hosts. The I2C serial communication bus reports proximity or touch detection and is used to facilitate parameter settings adjustment. Upon a proximity detection, the NIRQ output asserts, enabling the user to either determine the relative proximity distance, or simply obtain an indication of detection. A dedicated transmit enable (TXEN) pin is available to synchronize capacitive measurements for applications that require synchronous detection, enabling very low supply current and high noise immunity by only measuring proximity when requested. KEY PRODUCT FEATURES 2.7 – 5.5V Input Supply Voltage Capacitive Sensor Inputs Down to 0.08 fF Capacitance Resolution Stable Proximity & Touch Sensing With Temperature Capacitance Offset Compensation to 30pF Active Sensor Guarding Automatic Calibration Ultra Low Power Consumption: Active Mode: Doze Mode: Sleep Mode: 170 uA 18 uA 2.5 uA 400KHz I2C Serial Interface Four programmable I2C Sub-Addresses Input Levels Compatible with 1.8V Host Processors Open Drain NIRQ Interrupt pin Three (3) Reset Sources: POR, NRST pin, Soft Reset -40°C to +85°C Operation Compact Size: 3 x 3mm Thin QFN package Pb & Halogen Free, RoHS/WEEE compliant APPLICATIONS • Notebooks • Tablets • Mobile Appliances ORDERING INFORMATION Part Number SX9500IULTRT 1 SX9500EVKA 1 3000 Units/reel Package QFN-20 Eval. Kit Marking ZND8 TYPICAL APPLICATION CIRCUIT Revision 4 February 4, 2014 © 2014 Semtech Corporation 1 www.semtech.com WIRELESS & SENSING SX9500 Ultra Low Power, Four Channels Capacitive Proximity/Button Solution Table of Contents GENERAL DESCRIPTION........................................................................................................................ 1 KEY PRODUCT FEATURES..................................................................................................................... 1 APPLICATIONS....................................................................................................................................... 1 ORDERING INFORMATION...................................................................................................................... 1 TYPICAL APPLICATION CIRCUIT ............................................................................................................ 1 1 GENERAL DESCRIPTION............................................................................................................... 4 1.1 Pin Diagram 4 1.2 Marking Information 4 1.3 Pin Description 5 1.4 Acronyms 5 2 ELECTRICAL CHARACTERISTICS ................................................................................................. 6 2.1 Absolute Maximum Ratings 6 2.2 Operating Conditions 6 2.3 Thermal Characteristics 6 2.4 Electrical Specifications 7 3 PROXIMITY SENSING INTERFACE ................................................................................................. 9 3.1 Introduction 9 3.2 Scan Period 9 3.3 Analog Front-End (AFE) 3.3.1 Capacitive Sensing Basics 3.3.2 AFE Block Diagram 3.3.3 Capacitance-to-Voltage Conversion (C-to-V) 3.3.4 Shield Control 3.3.5 Offset Compensation 3.3.6 Analog-to-Digital Conversion (ADC) 10 10 12 12 12 12 13 3.4 Digital Processing 3.4.1 Overview 3.4.2 PROXRAW Update 3.4.3 PROXUSEFUL Update 3.4.4 PROXAVG Update 3.4.5 PROXDIFF Update 3.4.6 PROXSTAT Update 13 13 15 15 16 18 18 3.5 Host Operation 19 3.6 Operational Modes 3.6.1 Active 3.6.2 Doze 3.6.3 Sleep 3.6.4 TXEN Pin 20 20 20 20 20 4 I2C INTERFACE ........................................................................................................................... 21 4.1 Introduction 21 4.2 I2C Write 21 4.3 I2C Read 21 5 RESET......................................................................................................................................... 23 5.1 Power-up 23 5.2 NRST Pin 23 5.3 Software Reset 24 6 INTERRUPT ................................................................................................................................. 25 Revision 4 February 4, 2014 © 2014 Semtech Corporation 2 www.semtech.com WIRELESS & SENSING SX9500 Ultra Low Power, Four Channels Capacitive Proximity/Button Solution 6.1 Power-up 25 6.2 Assertion and Clearing 25 7 PINS DESCRIPTION ...........


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