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Auto-tuning touch controller does away with firmware

Posted: 01 Sep 2010 ?? ?Print Version ?Bookmark and Share

Keywords:capacitive? auto-tuning? firmware?

Cypress Semiconductor Corp. has unveiled a new CapSense capacitive touch-sensing controller that it says is auto-tuning, thereby eliminating the need for firmware or new software tools.

The ultra-low-power CY8CMBR2044 CapSense Express Mechanical Button Replacement controller features the company's auto-tuning algorithm and uses the included design toolbox to ensure optimal interface performance. Customers can utilize the advanced system debug features to go directly to production for such products as handheld products, as well as consumer, communication, white goods, lighting, industrial and medical applications.

The controller, which draws from 1.7 to 5.5V of power, consumes as low as 15uA per button in run mode and 100nA in deep sleep. Cypress said it used its patented CapSense Sigma Delta sensing method to ensure reliability even in difficult sensing conditions. The company said the SmartSense auto-tuning feature allows the device to dynamically optimize the baseline and detection threshold and adjusts for the optimal capacitance sensing range at power up and during runtime even in changing environmental conditions.

Cypress assured that the controller can accurately track button pushes even if the sensors are closely spaced. Other features include a built-in failure analysis with serial data out for debu and an integrated voltage regulator. The device is available in a 3mm x 3mm x 0.6mm 16-pad QFN package.

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