Cypress Semiconductor has introduced a new controller to its TrueTouch Gen5 family that brings enhanced levels of noise-immunity touchscreen control technology to superphones, smartphones, tablets and e-readers. The TMA568 controller supports writing and drawing with a 2.0-mm-tip passive stylus, enabling touchscreens to capture characters as small as 7 mm.
This capability is important for writing in languages that require enhanced character recognition for reliable text input, such as Chinese and Japanese. The controller also adds a palm rejection feature to the Gen5 family that recognises a user’s palm touching the screen and prevents unintended touch inputs.
Electronic noise from displays and after-market chargers can disrupt a touchscreen’s ability to operate properly. In response the TrueTouch Gen5 family’s ChargerArmor feature delivers 40 volt peak-to-peak (Vpp) charger noise immunity measured from 1 to 500 kHz with an ultra-thin 0.5-mm cover lens and a finger-size up to 22 mm—the most stringent specifications used to measure any touchscreen controller.
Along with leading noise performance, the new TMA568 controller delivers enhanced responsiveness by integrating 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 5.0-mm sensor pitch.
“We specifically designed our new TMA568 controller to deliver the features and performance required for next-generation superphones and tablets,” said John Carey, Senior Director of TrueTouch Marketing at Cypress. “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.”
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 noise immunity enables designers of next-generation handsets to implement ultra-thin, display-integrated stackups, including In-Cell, On-Cell, & direct lamination onto a noisy display. The result will be thinner, sleeker end products with a flawless user experience.