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Cypress touts 'most' flexible touchscreen controller

Posted: 23 Jul 2007 ?? ?Print Version ?Bookmark and Share

Keywords:flexible touchscreen controller? PSoC CapSense?

Cypress Semiconductor Corp. claims to have developed the industry's most flexible touchscreen controller solution, addressing a growing trend toward touchscreen technology in products from mobile handsets to white goods. Cypress's PSoC CapSense capability supports projected capacitance and surface capacitance technologies across a broad range of screen sizes and types.

The new solution takes advantage of the flexible PSoC mixed-signal array architecture to deliver high-accuracy touchscreen performance. Applications include small screen portable devices including mobile handsets, smartphones and PMPs, as well as for larger screens required by applications such as games, POS terminals and white goods.

The new PSoC CapSense touchscreen solution also offers designers the ability to implement multiple additional functions beyond touchscreens. The same devices can implement capacitive buttons and sliders simultaneously, replacing their mechanical counterparts, as well as proximity sensing. Engineers can also take advantage of the PSoC mixed-signal array to implement functions beyond CapSense. Such functions include, driving LEDs, backlight control, motor control, power management, I/O expansion, accelerometers and ambient light sensors. These functions, in conjunction with flexible communication (I?C and SPI), allow for unparalleled system integration.

Cypress's CapSense touchscreen solution is available using projected capacitance and surface capacitance sensing techniques. Projected capacitance uses an electrostatic field forced above the sensing surface to determine inputs. This format requires the use of patterned ITO and requires no calibration. It can sense through thick overlays and supports multi-touch detection and gesturing, making it ideal for small form factor screens. Surface capacitance uses an electric field created across the screen surface and senses from the four corners to determine location when a user's finger drains charge from the panel. This format scales up to larger screens well, as the I/O does not change with the size.

The PSoC CapSense touchscreen solution is available with the CY8C20x34, CY8C21x34 and CY8C24x94 device families. Both new formats of the solution are supported in the PSoC Designer IDE.

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