Semtech Corp.'s SX863x
capacitive touch button controllers come in 8 and 12-channel versions and
feature a long range of proximity detection of 10 cm (view
SX863x proximity detection range video clip), 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. These devices support a
wide range of button, slider and touch-wheel capacitive sensor panels that are
increasingly being designed into white goods, mobile phones, media players,
notebooks/netbooks, set top boxes and other consumer and industrial electronic
devices simplify capacitive touch control design by providing a plug-and-play
solution to reduce time-to-market while still allowing users to customize
various parameters (for example:scan
time, slave address, channel gain, sensitivity thresholds) for their specific
applications, without the need for new firmware development. They also reduce
the overall footprint and BOM cost by incorporating dedicated capacitive sense
inputs, without the need for external resistors and capacitors.
The capacitive analog
interface on each of the six ICs in the SX863x
platform is designed with a highly accurate A dc (analog-to-digital converter)
that provides superior sensitivity to work with thick overlay materials
(>5 mm) for extremely robust ESD immunity and to support the 10 cm range of
proximity detection. Additionally, a smart automatic offset compensation
function eliminates false triggers due to environmental factors such as
temperature, humidity and dirt.
The SX863x platform integrates eight, 256-step LED drivers
with individual intensity (linear or logarithmic) fading control optimized 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 set by the designer.
The devices in the SX863x platform include the 12-channel
SX8633, SX8634 and SX8635, which are offered in 5 x 5 mm 32-pad QFN packages;
and the 8-channel SX8636, SX8638 and SX8639 that come in 4 x 4 mm 28-pad QFN
packages. Semtech guarantees all of these devices to operate over the extended
(-40 to +85C) temperature range. All devices are Pb-free, halogen-free and fully
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