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Touchscreen controller boasts excellent noise rejection and precise stylus capability

Touchscreen controller boasts excellent noise rejection and precise stylus capability

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By eeNews Europe



 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. The TrueTouch Gen5 family’s ChargerArmor feature delivers unprecedented 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 22mm. No competing controllers deliver noise immunity over 15 Vpp under these conditions, claims the manufacturer. The chip 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 5.0-mm sensor pitch.

With Cypress’s unique and patented DualSense technology to execute both self-capacitance and mutual-capacitance measurements in the same device, the Gen5 family offers the industry’s best waterproofing for seamless performance in real-world conditions, including the presence of rain, condensation, or sweat. By combining this architecture with a 32-bit ARM Cortex M-Core processor, the TMA568 controller boasts 120-Hz refresh rates, and averages low power consumption of 12mW in active mode and 15 uW in deep-sleep mode.

Gen5 controllers drive the touchscreen at 10V and at high frequency with narrow-band, single-pass scanning and advanced hardware DSP filtering. The TrueTouch TMA568 controller comes in a 56-pin 6x6mm QFN package and in a 70-ball 5.5×5.5mm BGA package.

Visit Cypress at www.cypress.com

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