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Touchscreen MCU with face detection: No more dropped calls

Posted: 10 Sep 2014 ?? ?Print Version ?Bookmark and Share

Keywords:TMA445A? touchscreen? controller? face detection?

Cypress Semiconductor Corp. released a capacitive touchscreen controller with a face detection feature that prevents unintended touches from accidentally hanging up a call.

The face detection feature eliminates the need for infrared sensors in smartphones, reducing bill-of-material costs. In addition, the controller also supports tracking of multiple fingers in gloves.

The TrueTouch Gen4X TMA445A controller boasts delivery of accuracy and linearity for fingers of different sizes and gloves of various materials and thicknesses, including ski gloves. In addition, it automatically switches between glove and finger tracking without requiring the user to switch settings.

Based on a 32bit ARM Cortex processor, the controller consumes as low as 12mW in active mode and 15?W in deep-sleep mode. Its immunity to charger noise rates at 35V peak-to-peak (Vpp) from 1kHz to 500kHz, with a 0.5mm cover lens and a 9mm-wide finger.

A waterproofing technology accurately tracks wet or sweaty fingers, rejecting false touches caused by water on the screen. It also claims seamless performance in real-world conditions, including the presence of rain or condensation.

The Gen4X TMA445A is currently sampling, with production expected in the fourth quarter of 2014. The controller is available in both 44-pin and 48-pin QFN packages.

A demonstration on how TrueTouch enables touchscreen operation even with gloves on. Source: Cypress





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