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Capacitive touch controller improves gloved-finger tracking

Posted: 15 Oct 2014 ?? ?Print Version ?Bookmark and Share

Keywords:Cypress Semiconductor? touchscreen controller? tablet? ARM Cortex M-Core?

Cypress Semiconductor Corp. has introduced a touchscreen controller family aimed at large-screen superphones, smartphones, tablets and e-readers that promises to offer what the company boasts as the world's best gloved-finger tracking on capacitive touchscreens. The TrueTouch Gen5 TMA568 controller has also added "hover" support that allows touchscreens to anticipate the touch of a finger and enlarge content including points on a map, to make it easier to find and select objects.

In addition to the noise-immunity, waterproofing and palm rejection technology offered by the Gen5 TMA568 controller, the device claims to deliver best-in-class accuracy and linearity for multiple fingers of different sizes and gloves of various materials and thicknesses, including ski gloves. Also, it automatically switches between glove and finger tracking without requiring the user to change settings, noted the company.

TrueTouch Gen5 TMA568 controller

The controller's hover detection changes the fundamental navigation functions on mobile devices by emulating the "mouseover" feature of PCs, delivering easier, more accurate interface navigation. TMA568 also offers improved passive stylus support, accurately capturing 1mm stylus input for handwriting and signatures. This capability is important for writing in languages that require enhanced character recognition for reliable text input, such as Chinese and Japanese. The controller delivers a high degree of accuracy and linearity, along with the fast refresh rates required for handwriting and signature capture, Cypress continued.

Electronic noise from displays and after-market chargers can disrupt a touchscreen's ability to operate properly. The TMA568 leverages the Gen5 family's ChargerArmor feature to deliver 20V peak-to-peak (Vpp) charger noise immunity measured from 1-500kHz with an ultra-thin 0.5mm cover lens.

Cypress's patented DualSense technology executes both self-capacitance and mutual-capacitance measurements in the same device, enabling the Gen5 family to offer waterproofing for seamless performance in real-world conditions, indicated Cypress. By combining this architecture with a 32bit ARM Cortex M-Core processor, Gen5 controllers boast 120Hz refresh rates, and averages low power consumption of 12mW in active mode and 15uW in deep-sleep mode, detailed the company.

Gen5 controllers drive the touchscreen at 10V and at high frequency with narrow-band, single-pass scanning and advanced hardware DSP filtering. The family's unmatched noise immunity enables designers of next-generation handsets to implement ultra-thin, display-integrated stackups, including in-cell, on-cell and direct lamination onto a noisy display. The result will be thinner, sleeker end products with a flawless user experience, flaunted Cypress.

The TrueTouch TMA568 controller is available in 56-pin QFN and 70-ball BGA packages.

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