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TrueTouch Gen5 controller adds palm rejection feature

09 Oct 2013

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A new TrueTouch Gen5 touchscreen controller has been designed to silence electronic noise from displays and after-market chargers that disrupt the function of smartphones, superphones, tablet PCs and e-readers. The TMA568 controller from Cypress Semiconductor has a palm rejection function and supports the use of a 2.0mm tip passive stylus. The product comes in 56-pin 6x6mm QFN packaging as well as a 70-ball 5.5x5.5mm BGA packaging.

The TMA568 controller's 2.0mm tip passive stylus allows touchscreens to capture characters as small as 7mm. This capability is important for writing in languages that require enhanced character recognition for reliable text input, such as Chinese and Japanese. Its palm rejection feature prevents unintended touch inputs. TMA568 integrates 58 sense I/Os and 21 parallel receive channels, enabling scanning of the entire panel in a single pass. The controller provides precise tracking of smaller fingers and styluses by allowing for tight spacing of touchscreen sensors, and it supports screens up to 8.3-inches at a 5.0mm sensor pitch. The combination of Cypress' DualSense technology and the 32bit ARM Cortex M-Core processor gives the TMA568 controller 120Hz refresh rates as well as 12mW average power consumption in active mode and 15µW in deep-sleep mode.

"In addition to providing the Gen5 family's leading charger noise immunity and waterproofing, TMA568 brings precise stylus support, palm rejection and responsiveness to larger size touchscreens," said John Carey, Senior Director of TrueTouch Marketing at Cypress.

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