Newbury Park, Calif. - Semtech's USAR Division has introduced the ScreenCoder SPI/Serial, a touchscreen controller with built-in digitizer designed for RISC-based systems such as tablet PCs, Web pads, smart phones, PDAs and other wireless Internet appliances. Typical power consumption is less than 1 microamp.
The ScreenCoder SPI/Serial works with four-wire or eight-wire resistive touchscreens and can be interfaced to a system via a Serial Peripheral Interface (SPI) or asynchronous serial interface port, both common in RISC chip sets. An external PS/2 port is available for the hot-plug connection of an external PS/2 pointing device.
The controller features a proprietary motion algorithm and handles all touch detection, noise filtering and error elimination internally, the company said, without burdening the host or requiring extra software drivers.
The chip is priced at less than $3 in quantities of 100,000 or more. Evaluation kits that include a board, touchscreen, cables and documentation are available for $200.
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EETInfo No. 612