SX8636
Low Power, Capacitive Button Touch Controller (8 sensors) with Enhanced LED Drivers and Proximity Sensing
ADVANCED COMMUNICATIONS & SENSING
GENERAL DESCRIPTION
The SX8636 is an ultra low power, fully integrated 8channel solution for capacitive touch-buttons and proximity detection applications. Unlike many capacitive touch solutions, the SX8636 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 SX8636 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 SX8636 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 SX8636 supports the 400 kHz IC 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.
DATASHEET
KEY PRODUCT FEATURES
Complete eight Sensors Capacitive Touch Controller for Buttons Pre-configured for eight Buttons Eight LED Drivers with Individual Intensity, Fading Control and Autolight Mode 256 steps PWM Linear and Logarithmic control Proximity Sensing up to several centimetres 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 IC Interface with Interrupt -40°C to +85°C Operation

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