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Advanced automotive touchscreen controller from Cypress

Cypress Semiconductor has introduced an automotive capacitive touchscreen controller family offering an advanced feature set for next-generation infotainment systems.

The TrueTouch CYAT817 touchscreen controller family, which meets automotive quality standards, offers an advanced hover capability that can detect a finger up to 35mm above the screen and a force touch capability that provides accurate measurement of the pressure applied by multiple independent fingers.

The family’s integrated acoustic and haptic feedback control provides faster response times for a better user experience compared to systems where the processing of a touch and pressure applied are not measured on-chip.

Hover and Force Touch features meet stringent automotive electromagnetic interference (EMI) and electromagnetic compatibility (EMC) requirements.

With a power-efficient 32-bit Arm Cortex-M processor and an optimised analogue front-end, each controller can replace the mechanical on/off button of an infotainment system with a capacitive touch sensor, enabling sleek, modern interior designs.

The controllers are able to deliver faster response times by integrating decision and control processing on-chip for acoustic and haptic feedback so that systems are no longer required to transmit data on a touch input via Controller Area Network (CAN) or a Low-Voltage Differential Signaling (LVDS) backchannel for distributed implementations to be processed in the head-unit.

The CYAT817 controllers can support two standard host interfaces such as I2C and SPI, along with a CAN interface for either higher system integration or to implement redundancy for safety relevant applications per ISO 26262. The controllers protect against hacking with a cryptographic engine that securely encrypts communication with the head-unit, preventing unauthorised access of touch data containing sensitive user information that could allow reverse engineering of PINs or passwords.

Author
Neil Tyler

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