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Automotive touchscreen controllers
26 June 2019, Analogue, Mixed Signal, LSI

Microchip Technology has rolled out three new maXTouch touchscreen controllers and optimisation services which 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 add several variants that are cost-optimised for 9- to 13-inch automotive touchscreens to Microchip’s portfolio, and are complemented by the recently introduced MXT449TD, MXT641TD, MXT2113TD and MXT2912TD devices supporting up to 20-inch touchscreens. 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. Working with product experts in Microchip’s worldwide application design centres, this tool allows developers to enter user-defined RF limits and tune the shape of the transmitted burst waveform used for the touch-sensing acquisition.

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.

An evaluation kit is available for each of the parts in the new maXTouch touchscreen controller family. Each kit includes a printed circuit board (PCB) with the maXTouch touchscreen controller, a touch sensor on a clear glass lens, the flat printed circuit (FPC) to connect to the sensor, and a bridge PCB to connect the kit to the host computer via USB, as well as cables, software and documentation.

All parts are also compatible with maXTouch Studio, a full software development environment to support the evaluation of maXTouch touchscreen controllers.

For more information contact Dirk Venter, Altron Arrow, +27 11 923 9600, dventer@arrow.altech.co.za, www.altronarrow.com


Credit(s)
Supplied By: Altron Arrow
Tel: +27 11 923 9600
Fax: +27 11 923 9884
Email: info@arrow.altech.co.za
www: www.altronarrow.com
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