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Cypress augments capacitive sensor series

28 Mar 2014  | Graham Prophet

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Adding tools in its CapSense Controller series, Cypress Semiconductor introduced low-cost devices that require no coding, which allows designers to implement reliable user interfaces with good noise immunity, proximity sensing and water tolerance.

CapSense CY8CMBR3x controllers enable capacitive buttons, sliders and proximity sensors. They are part of Cypress' Mechanical Button Replacement (MBR) family, which uses SmartSense Auto-tuning algorithm to completely eliminate the requirement for manual system tuning. SmartSense Auto-tuning enables automatic tuning of more than 10 parameters to achieve optimal touch sensing performance.

The CY8CMBR3x devices are supported by Cypress' EZ-Click software tool, which combines GUI-based configuration, product debug and production-line testing with no firmware development required. Cypress has the CY3280-MBR3 kit for $25, allowing engineers to evaluate the family's advanced features. The kit also provides additional debug and test options, including the ability to vary trace lengths, add parasitic capacitance and change overlay thickness.

The controllers can implement up to 16 capacitive buttons or up to eight capacitive buttons while driving eight LEDs. Designers can add up to two proximity sensors with a 30cm sensing distance for wake-on-approach applications. The controllers feature Flanking Sensor Suppression (FSS) that eliminates false touches when buttons are closely spaced.

Devices in the CapSense MBR family deliver sensing in noisy environments using Cypress' patented CapSense Sigma-Delta (CSD) sensing method, ensuring superior immunity to conducted and radiated noise with a signal-to-noise ratio of greater than 100:1. Operating from 1.8V to 5.5V, the devices are ideal for a wide range of regulated and unregulated battery applications, including single coin cell battery operation. The controllers also feature an integrated voltage regulator to address power supply noise, as well as filters for any spurious noise. They are available in 8pin SOIC, 16pin QFN, 16pin SOIC or 24pin QFN packages.

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