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Date: 13-10-11

4x4 capacitive touch interface keypad device from Cypress Semiconductor

Cypress Semiconductor Corp. has announced the new CY8CMBR2016 device for implementing capacitive matrix button systems of up to 4 x 4 buttons. The CY8CMBR2016 supports industry standard "keypad scan" and "truth table" host interface protocols, enabling customers to leverage their existing host processor firmware, where there is no need of external firmware for the keypad purpose. The device also features multi-touch, perfect for matrix applications that require simultaneous button presses to enter various user interface modes. The CY8CMBR2016 operates over a 1.71 V to 5.5 V range and draws a supply current of 15 uA/button in run mode. Suggested applications include security panels, card reader keypads, biometric scanner keypads, fire alarm control panels, thermostats, home appliances as well as any system requiring up to 16 individual CapSense buttons. More information is available at www.cypress.com/go/capsense.

SmartSense Auto-tuning dynamically optimizes the capacitive baseline and detection threshold for each button. It adjusts for the optimal capacitance sensing range at power-up and during runtime as environmental conditions change, including temperature, humidity, and noise.

"This new CapSense Express controller with SmartSense Auto-tuning technology extends the world's easiest mechanical button replacement portfolio to matrix keypad applications," said Dirk Franklin, business unit director for Cypress's CapSense solutions. "The CY8CMBR2016 Matrix Keypad solution enables firmware, hardware, and mechanical engineers to implement capacitive sensing quickly and easily in their application."

This chip is designed to offer immunity to conducted and radiated noise. It also integrates a voltage regulator to address power supply noise as well as filters for any spurious noise.

The CY8CMBR2016 CapSense Express controller is currently in production in a 48-pad QFN package.


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