Safety certified capacitive touchscreen controller family

November 16, 2020 //By Ally Winning
Microchip’s maXTouch MXT336UD-MAUHA1 capacitive touchscreen controller family helps designs meet IEC 60730 and UL 60730 Class B specifications.
Microchip’s maXTouch MXT336UD-MAUHA1 capacitive touchscreen controller family helps designs meet IEC 60730 and UL 60730 Class B specifications.

Microchip claims that members of the new controller family are the market’s only touchscreen controllers that offer pre-certified, Class B firmware. The family consists of three controllers, the MXT112UD-MAUHA1, the MXT228UD-MAUHA1 and the MXT336UD-MAUHA1, each for different screen size needs, ranging from 2-to 8-inches.

The Class B certified touch controllers provide safety-related features to enable system shut off through a soft button on a touchscreen. This removes the need for an external safety certified stop or cancel button and associated MCU. They allow appliances to detect a touchscreen or appliance failure and shut down automatically through self-testing capabilities. The MXT336UD-MAUHA1 family moves safety functionality to a simplified single touchscreen interface, cutting costs and quickening time to market.

“Due to the risk of house fires caused by home appliances, appliance manufacturers must add functional safety to their machines, and Microchip’s MXT336UD-MAUHA1 touchscreen controller family is already certified for these required safety standards,” said Fanie Duvenhage, vice president of Microchip’s human machine interface business unit. “Integrating Class B certification into our touch controllers eases the design and qualification process for touch enabled appliances, ultimately putting safety first, while reducing costs and enabling modern user interface solutions.”

The new family features a high signal to noise ratio (SNR) design and proprietary differential mutual acquisition scheme., allowing the machine to reliably detect and track multiple fingers on surfaces exposed to moisture, water, grease and more, even if the user is wearing gloves.

Development Tools

Software and hardware tools are available. Software tools include maXTouch Studio and maXTouch Analyzer. Hardware tools include an evaluation kit, available upon request.

More information

https://www.microchip.com/wwwproducts/en/ATMXT336UD

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