Corp.'s new platform of capacitive sensing ICs are optimized for the
next-generation of energy-efficient, touch button television applications. The
8-channel SX8660/61 touch sensor platform features
integrated LED drivers and an extended, 10 cm range of proximity sensing. It is
designed to replace legacy mechanical button controllers with an analog output
interface (AOI) that supports the use of a buzzer for audible feedback making
the platform compatible with television designs.
capacitive analog interface on the SX8660/61 ICs is designed with an
analog-to-digital converter (A dc) that provides sensitivity to work with thick
overlay materials (up to 5 mm) for robust ESD immunity and to support a 10cm
range of proximity detection. With current consumption as low as 70µA at
operation, these ICs help designers meet energy-efficiency eco-regulations for
SX8660/61 platform also integrates eight, 256-step LED drivers with individual
intensity (linear or logarithmic) fading control that is optimized for human
vision. This allows design of buttons that automatically fade on when touched
and fade off when released with interval speed and initial and final light
intensity levels set by the designer. Special single and continuous breathing
modes are also available.
SX8660/61 platform simplifies capacitive touch control design and reduces
time-to-market with integrated multi-time programmable firmware that enables
users to customize various parameters such as scan time, slave address, channel
gain and sensitivity thresholds in their applications, without the need for new
firmware development. Additionally, capacitive sense inputs eliminate the need
for external resistors and capacitors, reducing design footprint, bill of
materials (BOM) and complexity.
The SX8661 has a preconfigured quick-start mode for
applications requiring proximity sensing and seven buttons, with one AOI and
seven LED drivers with PWM fading. The SX8660 is preconfigured with a
quick-start mode for applications with eight buttons, two AOIs, one buzzer
output and five LED drivers with PWM fading. The GPIOs can also be individually
configured for specific application requirements. Both devices feature a smart
automatic offset compensation function that eliminates false triggers due to environmental
factors such as temperature, humidity and dust. They are offered in a tiny, 4 x
4mm 28-QFN package and operate over a -40 to +85C temperature range.
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Design engineers need to prepare for a future in which their electronic products will use not just one or two, but possibly many user interfaces that involve touch, vision, gestures, and even eye movements.
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