Touch technology updated for single-layer sensors

August 19, 2014 // By Graham Prophet
Cypress Semiconductor’s TrueTouch Gen4X touchscreen controller family now supports single-layer multi-touch sensors, which lower manufacturing costs without, the company says, compromising performance.

The Gen4X TMA445 controller enables thin form factors by using Cypress's Single-Layer Independent Multi-touch (SLIM) sensor structures. The controller also adds support for tracking of multiple fingers in gloves.

The TMA445 controller delivers accuracy and linearity for fingers of different sizes and gloves of various materials and thicknesses. It automatically switches between glove and finger tracking without requiring the user to switch settings. Gen4X controllers provide water tolerance and immunity to electronic noise from aftermarket chargers and displays.

The TrueTouch Gen4X family offers immunity to charger noise of up to 35V peak-to-peak (Vpp) from 1-500 kHz, with a 0.5-mm cover lens and a 9-mm-wide finger. With Cypress’s DualSense technology to execute both self-capacitance and mutual-capacitance measurements in the same device, the family offers the water rejection and wet finger tracking for real-world conditions, including the presence of rain, condensation, or sweat.

According to Yi Hang Wang, Director of TrueTouch Marketing for Cypress, “SLIM helps ...create thin mobile devices at lower costs. This combination has helped the family quickly gain popularity in China and other cost-competitive markets.”

The Gen4X family is based on a 32-bit ARM Cortex M processor,core and the TMA445 controller averages low power consumption of 12 mW in active mode and 15 µW in deep-sleep mode.