Touchscreen controller boasts excellent noise rejection and precise stylus capability
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