Semtech has announced the SX864x platform of capacitive sensing ICs that come in 8- and 12-channel models and feature integrated LED drivers. This platform supports a wide range of button, slider and touch wheel capacitive sensor designs that are increasingly found in white goods, mobile phones, media players, notebooks/netbooks and other consumer electronics.
The capacitive analog interface on each of the seven ICs in the SX864x platform is designed with a highly accurate ADC that provides the sensitivity to work with overlay materials more than 5 mm thick, offering robust and ESD-immune system design. With current consumption as little as 80 μA at operation, these ICs are well suited for battery-powered devices. This platform also integrates eight, 256-step LED drivers with individual intensity and linear and logarithmic fading control that is optimised for human vision.
Designers may customise various parameters such as scan time, slave address, channel gain and sensitivity thresholds in their applications without the need for new firmware development. False triggers due to environmental factors such as temperature, humidity and dust can also be eliminated via an on-chip calibration algorithm.
The devices in the SX864x platform include the 12-channel SX8643/44/45, which are offered in 5 x 5 mm 32-QFN packages; and the 8-channel SX8646/47/48/49 that come in 4 x4 mm 28-QFN packages. Semtech guarantees all of these devices to operate over the -40°C to +85°C temperature range.
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