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SX8649 Datasheet(PDF) 1 Page - Semtech Corporation |
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SX8649 Datasheet(HTML) 1 Page - Semtech Corporation |
1 / 77 page ADVANCED COMMUNICATIONS & SENSING DATASHEET Revision 7_6, February 10 © 2010 Semtech Corp. www.semtech.com 1 SX8649 Ultra Low Power, Capacitive Button and Wheel Touch Controller (8 sensors) with Enhanced LED Drivers GENERAL DESCRIPTION The SX8649 is an ultra low power, fully integrated 8- channel solution for capacitive touch-buttons and wheel applications. Unlike many capacitive touch solutions, the SX8649 features dedicated capacitive sense inputs (that requires no external components) in addition to 8 general purpose I/O ports (GPIO). Each GPIO is typically configured as LED driver with independent PWM source for enhanced lighting control such as intensity and fading. The SX8649 includes a capacitive 10 bit ADC analog interface with automatic compensation up to 100pF. The high resolution capacitive sensing supports a wide variety of touch pad sizes and shapes and allows capacitive buttons to be created using thick overlay materials (up to 5mm) for an extremely robust and ESD immune system design. The SX8649 incorporates a versatile firmware that was specially designed to simplify capacitive touch solution design and offers reduced time-to-market. Integrated multi-time programmable memory provides the ultimate flexibility to modify key firmware parameters (gain, threshold, scan period, auto offset compensation… ) in the field without the need for new firmware development. The SX8649 supports the 400 kHz I²C serial bus data protocol and includes a field programmable slave address. The tiny 4mm x 4mm footprint makes it an ideal solution for portable, battery powered applications where power and density are at a premium. TYPICAL APPLICATION CIRCUIT KEY PRODUCT FEATURES Complete Eight Sensors Capacitive Touch Controller for Buttons and Wheel Pre-configured for 4 Buttons and a Wheel 8 LED Drivers with Individual Intensity, Fading Control and Autolight Mode 256 steps PWM Linear and Logarithmic control High Resolution Capacitive Sensing Up to 100pF of Offset Capacitance Compensation at Full Sensitivity Capable of Sensing through Overlay Materials up to 5mm thick Extremely Low Power Optimized for Portable Application 8uA (typ) in Sleep Mode 80uA (typ) in Doze Mode (Scanning Period 195ms) 175uA (typ) in Active Mode (Scanning Period 30ms) Programmable Scanning Period from 15ms to 1500ms Auto Offset Compensation Eliminates False Triggers due to Environmental Factors (Temperature, Humidity) Initiated on Power-up and Configurable Intervals Multi-Time In-Field Programmable Firmware Parameters for Ultimate Flexibility On-chip user programmable memory for fast, self contained start-up "Smart" Wake-up Sequence for Easy Activation from Doze No External Components per Sensor Input Internal Clock Requires No External Components Differential Sensor Sampling for Reduced EMI 400 KHz Fast-Mode I²C Interface with Interrupt -40°C to +85°C Operation APPLICATIONS Notebook/Netbook/Portable/Handheld computers Cell phones, PDAs Consumer Products, Instrumentation, Automotive Mechanical Button Replacement ORDERING INFORMATION Part Number Temperature Range Package SX8649I05AULTRT 1 -40°C to +85°C Lead Free MLPQ-UT28 1 3000 Units/reel * This device is RoHS/WEEE compliant and Halogen Free |
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