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Controller Enables Multi-Touch Operation for Resistive Touchscreens
The new BU21023/BU21024 Series of high-speed, high noise immunity, low-voltage resistive touchscreen controllers are now available from ROHM Semiconductor. These new controllers are asserted to be the industry’s first to enable multi-touch (two-point) operation and intuitive gesture control, including pinching, spreading and rotating – previously possible only with more expensive capacitive touch systems. The BU21023/BU21024 series ICs integrate a dedicated analog circuit and CPU for precise two-point coordinate and gesture detection. A calibration function is also built-in that minimizes the effects of panel variations during production as well as fluctuations in touchscreen device characteristics caused by temperature variations or time-based degradation.