SX9300IULTRT Semtech

SX9300 Ultra Low Power, Dual Channel Smart Proximity SAR Compliant Solution WIRELESS & SENSING GENERAL DESCRIPTION KEY PRODUCT FEATURES The SX9300 is the worlds first dual channel capacitive 2.7 5.5V Input Supply Voltage Specific Absorption Rate (SAR) controller that accurately Dual SAR Capacitive Sensor Inputs discriminates between an inanimate object and human body On-Chip SAR Engine For Body versus Inanimate Object proximity. The resulting detection is used in portable Detection electronic devices to reduce and control radio-frequency Down to 0.08 fF Capacitance Resolution (RF) emission power in the presence of a human body, Stable Proximity Sensing With Temperature enabling significant performance advantages for 20mm detection distance manufacturers of electronic devices with electro-magnetic Capacitance Offset Compensation up to 30pF radiation sources to meet stringent emission regulations criteria and Specific Absorption Rate (SAR) standards. Active Sensor Guarding Operating directly from an input supply voltage of 2.7 to Automatic Calibration 5.5V, the SX9300 outputs its data via a 1.65 5.5V host Ultra Low Power Consumption: compatible I2C serial bus. Active Mode: 170 uA Doze Mode: 18 uA The I2C serial communication bus port is compatible with Sleep Mode: 2.5 uA 1.8V host control to report body detection/proximity and to facilitate parameter settings adjustment. Upon proximity 400kHz I2C Serial Interface detection, the NIRQ output asserts, enabling the user to Four programmable I2C Sub-Addresses either determine the relative proximity distance, or simply Input Levels Compatible with 1.8V Host Processors obtain an indication of detection. Open Drain NIRQ Interrupt pin The SX9300 includes an on-chip auto-calibration controller Three (3) Reset Sources: POR, NRST pin, Soft Reset that regularly performs sensitivity adjustments to maintain -40C to +85C Operation peak performance over a wide variation of temperature, Compact Size: 3 x 3mm Thin QFN package humidity and noise environments, providing simplified product development and enhanced performance. A Pb & Halogen Free, RoHS/WEEE compliant dedicated transmit enable (TXEN) pin is available to synchronize proximity measurements to RF transmission, APPLICATIONS enabling very low supply current and high noise immunity by SAR Compliant Systems only measuring proximity when requested. Notebooks Tablets Mobile Phones Mobile Hot Spots ORDERING INFORMATION Part Number Package Marking 1 QFN-20 ZM5C SX9300IULTRT SX9300EVKA Eval. Kit - 1 3000 Units/reel TYPICAL APPLICATION CIRCUIT Revision 4 February 5, 2014 2014 Semtech Corporation www.semtech.com 1 SX9300 Ultra Low Power, Dual Channel Smart Proximity SAR Compliant Solution WIRELESS & SENSING 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) 10 3.3.1 Capacitive Sensing Basics 10 3.3.2 AFE Block Diagram 12 3.3.3 Capacitance-to-Voltage Conversion (C-to-V) 12 3.3.4 Shield Control 12 3.3.5 Offset Compensation 12 3.3.6 Analog-to-Digital Conversion (ADC) 13 3.4 Digital Processing 13 3.4.1 Overview 13 3.4.2 PROXRAW Update 15 3.4.3 PROXUSEFUL Update 15 3.4.4 PROXAVG Update 16 3.4.5 PROXDIFF Update 18 3.4.6 PROXSTAT Update 18 3.5 Host Operation 19 3.6 Operational Modes 20 3.6.1 Active 20 3.6.2 Doze 20 3.6.3 Sleep 20 3.6.4 TXEN Pin 20 4 SMART SAR ENGINE .................................................................................................................. 21 4.1 Introduction 21 4.2 Sensor Design 21 4.3 Processing 22 5 I2C INTERFACE ........................................................................................................................... 23 5.1 Introduction 23 5.2 I2C Write 23 5.3 I2C Read 23 6 RESET ......................................................................................................................................... 25 Revision 4 February 5, 2014 2014 Semtech Corporation www.semtech.com 2