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Controllers boast low-power proximity detection

Posted: 14 Jan 2013 ?? ?Print Version ?Bookmark and Share

Keywords:controllers? noise? ultra-low power? sensing algorithm?

Cypress Semiconductor Corp. has announced the CY8C20xx7/S CapSense and CapSense Plus controllers with Cypress's QuietZone technology to combat noise. According to the company, the devices provide ultra-low power consumption, high signal to noise ratio (SNR) and high immunity to noise. Likewise, the device claims an ideal solution for proximity and water tolerance, noted the company.

The CapSense controllers feature QuietZone technology that according to the company provides unequaled immunity to radiated and conducted noise. Its high sensitivity can determine changes in finger capacitance as low as 0.1pF. A key component of this technology is Cypress's patented Capacitive Sigma Delta (CSD) Plus sensing algorithm.

The CY8C20xx7S devices feature SmartSense Auto-tuning that automatically sets and monitors the performance of each sensor and dynamically compensates for noise and environmental variations during runtime to deliver optimal sensor performance and uniform button response. This technology also adapts to manufacturing variations in PCBs, overlays, and tunes out noise generators such as LCD inverters, AC lines and switched-mode power supplies, saving engineers precious development time in implementing capacitive touch designs. It tunes all design parameters for both proximity detection and water tolerance features, with separate fine tuning for proximity distance. SmartSense simplifies the design process and satisfies the rigorous demands of the industrial and white goods markets, described Cypress.

The CY8C20xx7/S also offers proximity detection of up to 30cm. Its low power enables proximity designs in battery-powered applications such as "wake-on-approach" for mice that provides lower system power consumption by allowing the device to sleep until a user's hand approaches. The family also has driven shield capability, which enhances water tolerance capabilities in applications that face the challenges of mist, water droplets or streaming water.

The CY8C20xx7/S is geared for Bluetooth headsets, smartphones and tablets that require lower operating voltages to white goods, small home appliances, TV, monitors and printers that require high SNR for robust touch performance. These devices are also ideal for enabling wake-on approach features in applications such as PC peripherals.

The CY8C20xx7/S CapSense controller family is in production in 16-QFN, 30-WLCSP, 24-QFN, 32-QFN, 48-QFN and 16-SOIC packages. The CY8C20xx7/S controllers can be easily evaluated using the AEK-CY8C20xx7 QuietZone Starter Kit from Artaflex. Based on the CY8C20247S-24LKXI, the $9.99 Starter Kit allows you to develop proof of concepts by directly connecting to the target design boards.

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