Automotive touchscreen controller detects fingers up to 35mm above the screen

January 16, 2018 //By Julien Happich
Automotive touchscreen controller detects fingers up to 35mm above the screen
The TrueTouch CYAT817 touchscreen controller family was specifically designed by Cypress Semiconductor to meet rigorous automotive quality standards. The family 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. 
The chips implement their Hover and Force Touch features while meeting stringent automotive electromagnetic interference (EMI) and electromagnetic compatibility (EMC) requirements. With a power-efficient 32-bit Arm Cortex-M processor and optimized analog 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 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 unauthorized access of touch data containing sensitive user information that could allow reverse engineering of PINs or passwords.
Cypress Semiconductor -  www.cypress.com


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