Capacitive touch controllers ease EMI qualification for cars

June 28, 2019 //By Julien Happich
touch controllers
Microchip’s maXTouch touchscreen controllers and optimisation services address the Electromagnetic Interference (EMI) and Electromagnetic Compatibility (EMC) challenges faced by developers of automotive touchscreens.

The TD family of touch controllers features a new differential mutual signal acquisition method that significantly increases the Signal-to-Noise Ratio (SNR). This allows the use of very thick glass or plastic cover lenses and multi-finger thick gloved touch support up to the equivalent of 4.5 mm polymethyl methacrylate (PMMA).

The MXT1067TD, MXT1189TD and MXT1665TD devices are cost-optimised for nine- to 13-inch automotive touchscreens, complementing the company’s portfolio already supporting touchscreens up to 20-inch. Each device addresses aspects of the increasing demand for functional safety features and is designed in accordance with the Automotive SPICE Level 3 capability and ISO 26262 Automotive Safety Integrity Level (ASIL) B requirements. All devices in the TD family feature a unique waveform shaping capability to optimise the performance of the touch controller’s radiated emissions through an EMI optimisation tool. Waveform shaping is achieved through firmware parameters derived from the tool and helps designers to position the fundamental burst frequency to work together with other in-vehicle applications, such as the remote keyless entry system. The resulting parameters are then simply added to the maXTouch configuration file, which customises the touch controller performance to the individual customer design.

Microchip Technology – www.microchip.com


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