maXTouchTM is a
capacitive touchscreen controller supporting an unlimited number of unique
simultaneous touches, video-quality screen refresh rate of 250 Hz, full zoom,
rotate, full-speed handwriting and recognizes stylus/fingernail input. Atmel's
maXTouch technology will give consumers a human-to-machine experience that,
until now, has not been available. Consumers will find maXTouch attractive
because it will add the following features to mobile phones, netbooks, laptops,
home appliances and many other applications: low power consumption; sSupport
for an unlimited number of unique simultaneous touches; supports touch screens
surpassing 10 inches; full zoom, stretch/pinch, rotate, handwriting and shape
recognition; rejecting unintended touches; shape recognition such as face
detection on mobile phones; and stylus input. This architecture enables the
simultaneous processing of 224 nodes at 250 Hz, while consuming less than 1.8
mW. By integrating the
entire capacitive sensing circuitry on-chip, maXTouch provides a fully
integrated single-chip solution without the need for external components to
support the capacitive sensing, minimizing the cost and PCB footprint
requirements. Additionally, the mXT224 integrates Atmel's single-cycle RISC
AVRÂ® core with 32 registers and two on-chip DSP engines that process the X and
Y positions on the touchscreen. An event system and peripheral DMA controller
off-load all inter-peripheral communications and data transfer operations from
the CPU, freeing it up for post-processing of the sensor image. According to the company, the mXT224 is the
first capacitive touchscreen solution that supports not just finger touch, but
also stylus, fingernails and gloves for drawing or signature capture and character
recognition, thanks to its 80:1 signal-to-noise ratio (SNR) and extremely fast
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