A new range of high speed, low voltage resistive touchscreen controllers has been announced by Rohm Semiconductor.
The company claims the BU21023/BU21024 series is the industry's first to enable multi touch operation and intuitive gesture control, including pinching, spreading and rotating. The ICs integrate a dedicated analogue circuit and cpu for precise two point coordinate and gesture detection. Nick Ikuta, senior technical marketing manager at Rohm, said: "The functionality of electronic devices is increasing day by day and operation by touch panel is increasingly shifting toward pinch, spread and other intuitive finger gestures. Until now, in order to actualise functions like these, electrostatic capacitance type touchscreens were the only choice. With the new BU21023/BU21024 series, conventional 4wire resistive touchscreen designs can be easily expanded to include dual touch." The devices feature a built in calibration function, which is designed to minimise the effects of panel variations during production, as well as fluctuations in touchscreen device characteristics caused by temperature variations or time based degradation.