Semtech's SX863x capacitive touch button controllers are available in 8- and 12-channel versions and feature a long range of proximity detection of 10cm allowing the sensor to control power-management and other features such as system wake-up, LED wake-up and automatic backlight activation upon user detection. The devices support a range of button, slider and touch-wheel capacitive sensor panels that are incorporated into white goods, mobile phones, media players, notebooks or netbooks, set top boxes and other consumer and industrial electronic products. The devices provides a plug-and-play solution to reduce time-to-market. The analogue interface is designed with an accurate ADC that provides good sensitivity to work with thick overlay materials (more than 5mm) for robust ESD immunity and support the 10cm range of proximity detection. An offset compensation function eliminates false triggers due to temperature, humidity and dirt. With an operating current consumption of 80µA, the devices are suitable for battery-powered applications. The platform integrates eight, 256-step LED drivers with individual intensity (linear or logarithmic) fading control optimised for human vision. This allows design of buttons that automatically fade in when touched and fade out when released, with interval speed and initial and final light intensity levels.
