SX8660 Ultra Low Power, Capacitive Button Touch Controller (8 sensors) with Enhanced LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING DATASHEET GENERAL DESCRIPTION KEY PRODUCT FEATURES The SX8660 is an ultra low power, fully integrated 8- Complete 8 Sensors Capacitive Touch-Button Solution channel solution for capacitive touch-button o Up to 8 LED Drivers for individual Visual Feedback with applications. Unlike many capacitive touch solutions, Auto Lightening the SX8660 features dedicated capacitive sense o Configurable Single, Repeat, Continuous Fading Mode inputs (that requires no external components) in o 256 steps PWM Linear and Logarithmic control addition to 8 general purpose I/O ports (GPIO). Each of the 8 on-chip GPIO/LED driver is equipped with High Resolution Capacitive Sensing independent PWM source for enhanced visual effect o Up to 100pF of Offset Cap. Compensation at Full such as dimming, blinking and breathing. Sensitivity o Capable of Sensing thru Overlay Materials( <5mm thick) The SX8660 includes a capacitive 10 bit ADC analog Up to 2 Analog Output Interfaces (AOI-A and AOI-B) interface with automatic compensation up to 100pF. o Enable button detection thru hosts ADC The high resolution capacitive sensing supports a Support of buzzer for audible feedback wide variety of touch pad sizes and shapes and User-selectable Button Reporting Configuration allows capacitive buttons to be created using thick overlay materials (up to 5mm) for an extremely o Report First or Report Strongest robust and ESD immune system design. Extremely Low Power o 8uA (typ) in Sleep Mode The SX8660 incorporates a versatile firmware that o 70uA (typ) in Doze Mode (195ms) was specially designed to simplify capacitive touch o 200uA (typ) in Active Mode mode (30ms) solution design and offers reduced time-to-market. Programmable Scanning Period from 15ms to several Integrated multi-time programmable memory seconds provides the ultimate flexibility to modify key firmware Auto Offset Compensation parameters (gain, threshold, scan period, auto offset compensation) in the field without the need for new o Eliminates false triggers due to environmental factors firmware development. (temperature, humidity) o Initiated on power-up and configurable intervals The SX8660 supports the 400 kHz IC serial bus Multi-Time In-Field Programmable Firmware Parameters data protocol and includes a field programmable for Ultimate Flexibility slave address. The tiny 4mm x 4mm footprint makes o On-chip user programmable memory for fast, self it an ideal solution for portable, battery powered contained start-up applications where power and density are at a No External Components per Sensor Input premium. Internal Clock Requires No External Components TYPICAL APPLICATION CIRCUIT Differential Sensor Sampling for Reduced EMI Optional 400 KHz IC Interface w/ Programmable Address -40C to +85C Operation APPLICATIONS LCD TVs, Monitors White Goods Notebook/Netbook/Portable/Handheld computers Consumer Products, Instrumentation, Automotive Mechanical Button Replacement ORDERING INFORMATION Part Number Temperature Package Range 1 SX8660I06AULTRT -40C to +85C Lead Free MLPQ-UT28 1 3000 Units/reel * This device is RoHS/WEEE compliant and Halogen Free Revision v2.3, June 2010 2010 Semtech Corp. www.semtech.com 1 SX8660 Ultra Low Power, Capacitive Button Touch Controller (8 sensors) with Enhanced LED Drivers and Analog Output ADVANCED COMMUNICATIONS & SENSING DATASHEET 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 11 3.2.1 General 11 3.2.2 GPIOs 11 3.2.3 Analog Output Interface A and B (SPO mode) 11 3.2.4 Buzzer (SPO mode) 11 3.2.5 Parameters 11 3.2.6 Configuration 12 3.3 Scan Period 12 3.4 Operation modes 12 3.5 Sensors on the PCB 13 3.6 Button Information 14 3.7 Buzzer 14 3.8 Analog Output Interface 15 3.9 Analog Sensing Interface 17 3.10 Offset Compensation 19 3.11 Processing 20 3.12 Configuration 20 3.13 Power Management 22 3.14 Clock Circuitry 22 3.15 I2C interface 22 3.16 Interrupt 23 3.16.1 Power up 23 3.16.2 Assertion 23 3.16.3 Clearing 23 3.16.4 Example 24 3.17 Reset 24 Revision v2.3, June 2010 2010 Semtech Corp. www.semtech.com 2