Smartwave™ Multi-Touch

DA8901 drives a number of infrared Light Emitting Diode (LEDs) in a controlled sequence, injecting light into the cover lens of the display. Using FlatFrog’s patented PSD Touch technology, as users touch the surface, scattered light is detected by multiple infrared receivers connected to DA8901’s detector front end. The resulting signals are amplified and dynamically filtered to remove ambient light before being converted into the digital domain using a high linearity ADC. The data is then subjected to FlatFrog’s PSD Touch algorithms using MTIC’s 3 custom ALUs and ARM micro controller before being communicated via SDIO to a standard external touch controller IC which provides the touch coordinates to the main PC processor.