Analogue, Mixed Signal, LSI


Touch screen controller

23 April 2014 Analogue, Mixed Signal, LSI

FTDI Chip has expanded its Embedded Video Engine (EVE) offering with the introduction of the FT801, which supports intelligent display implementations with capacitive touch screens.

The new device possesses the same key elements found on the initial EVE product, the FT800. It supports display, audio and touch functionality, with capacitive touch element provided through an I²C interface which is connected to a standard capacitive touch controller. The FT801 brings together the functionality and system benefits of EVE with the increased brightness, interactivity and vividness that users and developers have come to recognise in capacitive touch screen technology.

Targeted at touch screen/display assemblies with formats up to 512 x 512 pixels, the ICs that make up the EVE platform all employ an object-oriented approach, with line-by-line rendering of graphics at 1/16th pixel resolution. This equates to simplified systems where no frame buffers are needed and where lower-end 8- or 16-bit microcontrollers can be specified.

The FT801 can be interfaced without difficulty to a capacitive touch controller via an I²C interface, with its multi-touch capabilities enabling five independent touch points to be simultaneously determined. This facilitates the deployment of human machine interfaces (HMIs) which several people can utilise at once, or conversely where a variety of complex hand gestures can be detected. The IC’s sophisticated hardware engine has the ability to recognise touch tags and track touch movement, delivering notification of up to 255 touch tags.

As the FT801 comes in exactly the same package size and form factor as the FT800 (7 x 7 x 0,9 mm, 48-lead VQFN), it expedites the re-use of existing OEM designs, with migration to capacitive touch achieved quickly and simply. A 12 MHz crystal oscillator with PLL can deliver a 48 MHz or 36 MHz system clock.



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