STMicroelectronics has introduced a low-power IC containing all the functions necessary to control an OFN (optical finger navigation) module or optical joystick. The VD5376 optical joystick controller helps users interact with the advanced features of portable electronic products. An OFN module to control an on-screen cursor enables mobile users to enjoy increased accuracy and flexibility of a desktop-PC mouse. The module is embedded in the outer casing, and incorporates a light source similar to that of a desktop optical mouse. When the user moves a fingertip over the surface of the module, the IC measures the tiny movements to produce a corresponding change in cursor position on the screen. The IC contains all the features necessary to manage an OFN module, and is supplied as a bare die that can be easily incorporated into next-generation modules delivering the high performance and power efficiency demanded by new handheld markets. Features include a highly sensitive and reliable imaging array for detecting finger movement, as well as driver circuitry for the light source. This IC is compatible with laser, infrared or optical LEDs, thereby maximising flexibility for module builders.
