SX8644

WIRELESS & SENSING SX8644 Ultra Low Power, Capacitive Button and Slider Touch Controller (12 sensors) with Enhanced LED Drivers DATASHEET GENERAL DESCRIPTION The SX8644 is an ultra low power, fully integrated 12-channel solution for capacitive touch-buttons and slider applications. Unlike many capacitive touch solutions, the SX8644 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 SX8644 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 SX8644 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 SX8644 supports the 400 kHz I²C serial bus data protocol and includes a field programmable slave address. The SX8644 is available in a tiny MLPQ 5mm x 5mm package. The small ...