Low-power touch screen controller

11 June 2008 Opto-Electronics

The new STMPE811 from STMicroelectronics is a four-wire resistive touch screen controller featuring autonomous functionality to minimise demands on the host processor. For embedded designers, this frees valuable CPU cycles to ease pressures on performance, power consumption and response times.

Built-in features include an internal 12-bit ADC for high resolution as well as 128 x 32-bit FIFO data buffers for smooth position tracking. There are also features for accurate position identification and a window-masking function to support multiple sense windows. Special low-power design features achieve active current below 1 mA, idle current less than 1 μA, and an ultra-low-power 150 nA hibernation mode.

By combining these functions into a compact 3 x 3 mm QFN-16 package, the STMPE811 saves footprint and extends battery lifetime in portable applications such as PDAs, mobile phones, GPS receivers, game consoles and POS terminals.

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