SX8633 Low Power, Capacitive Button Touch Controller (12 sensors) with Enhanced LED Drivers and Proximity Sensing ADVANCED COMMUNICATIONS & SENSING DATASHEET GENERAL DESCRIPTION KEY PRODUCT FEATURES The SX8633 is an ultra low power, fully integrated Complete twelve Sensors Capacitive Touch Controller for 12-channel solution for capacitive touch-buttons and Buttons proximity detection applications. Unlike many Pre-configured for eight Buttons capacitive touch solutions, the SX8633 features Eight LED Drivers with Individual Intensity, Fading dedicated capacitive sense inputs (that requires no Control and Autolight Mode external components) in addition to 8 general purpose I/O ports (GPIO). Each GPIO is typically 256 steps PWM Linear and Logarithmic control configured as LED driver with independent PWM Proximity Sensing up to several centimetres source for enhanced lighting control such as intensity High Resolution Capacitive Sensing and fading. Up to 100pF of Offset Capacitance Compensation at Full Sensitivity The SX8633 includes a capacitive 10 bit ADC analog Capable of Sensing through Overlay Materials up to interface with automatic compensation up to 100pF. 5mm thick The high resolution capacitive sensing supports a Extremely Low Power Optimized for Portable Application wide variety of touch pad sizes and shapes and allows capacitive buttons to be created using thick 8uA (typ) in Sleep Mode overlay materials (up to 5mm) for an extremely 80uA (typ) in Doze Mode (Scanning Period 195ms) robust and ESD immune system design. 220uA (typ) in Active Mode (Scanning Period 30ms) Programmable Scanning Period from 15ms to 1500ms The SX8633 incorporates a versatile firmware that Auto Offset Compensation was specially designed to simplify capacitive touch Eliminates False Triggers due to Environmental solution design and offers reduced time-to-market. Factors (Temperature, Humidity) Integrated multi-time programmable memory Initiated on Power-up and Configurable Intervals provides the ultimate flexibility to modify key firmware parameters (gain, threshold, scan period, auto offset Multi-Time In-Field Programmable Firmware Parameters compensation ) in the field without the need for for Ultimate Flexibility new firmware development. On-chip user programmable memory for fast, self contained start-up The SX8633 supports the 400 kHz IC serial bus Smar Wake-up Sequence for Easy Activation from Doze data protocol and includes a field programmable No External Components per Sensor Input slave address. The tiny 5mm x 5mm footprint makes Internal Clock Requires No External Components it an ideal solution for portable, battery powered Differential Sensor Sampling for Reduced EMI applications where power and density are at a premium. 400 KHz Fast-Mode IC Interface with Interrupt -40C to +85C Operation TYPICAL APPLICATION CIRCUIT APPLICATIONS Notebook/Netbook/Portable/Handheld computers d7 cap0 Cell phones, PDAs d0 d6 cap1 Consumer Products, Instrumentation, Automotive d1 gnd cap2 SX8633 d2 Mechanical Button Replacement cap3 analog clock PWM gpio5 d3 sensor generation LED d5 cap4 interface RC controller gpio4 d4 d4 ORDERING INFORMATION cap5 d5 power management gpio3 d3 cap6 gpio2 d6 micro GPIO d2 Part Number Temperature Package processor controller cap7 gnd d7 Range cap8 RAM NVM gpio1 d1 1 SX8633I05AWLTRT -40C to +85C Lead Free MLPQ-W32 cap9 gpio0 d0 ROM I2C bottom plate 1 3000 Units/reel cap10 HOST * This device is RoHS/WEEE compliant and Halogen Free Revision 8 1, February 16 2010 Semtech Corp. www.semtech.com 1 proximity cap11 vana cn resetb cp gnd vdd vdig intb scl gpio7 gpio6 sda SX8633 Low Power, Capacitive Button Touch Controller (12 sensors) with Enhanced LED Drivers and Proximity Sensing 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 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 15 3.8 Offset Compensation 16 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 Revision 8 1, February 16 2010 Semtech Corp. www.semtech.com 2