Semtech's SX8633 is an ultra-low-power, fully integrated, 12-channel solution for capacitive touch-buttons, and proximity detection applications. Unlike many capacitive touch solutions, the SX8633 features dedicated capacitive sense inputs (that require no external components) in addition to eight general-purpose I/O ports (GPIO). Each GPIO is typically configured as an LED driver with independent PWM source for enhanced lighting control, such as intensity and fading. The SX8633 includes a capacitive 10-bit ADC analog interface with automatic compensation up to 100 pF. 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 5 mm) for an extremely robust and ESD-immune system design. The SX8633 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 SX8633 supports the 400 kHz I²C serial bus data protocol and includes a field programmable slave address. The tiny 5 mm x 5 mm footprint makes it an ideal solution for portable, battery-powered applications where power and density are at a premium.

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