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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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STMPE811 Datasheet(PDF) 33 Page - STMicroelectronics |
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STMPE811 Datasheet(HTML) 33 Page - STMicroelectronics |
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33 / 64 page  STMPE811 Touch screen controller Doc ID 14489 Rev 2 33/64 Window tracking The -WDW_X and WDW_Y registers allow to pre-set a sub-window in the touch screen such that any touch position that is outside the sub-window will be discarded. Figure 10. Window tracking FIFO FIFO has a depth of 128 sectors. This is enough for 128 sets of touch data at maximum resolution (2 x 12 bits). FIFO can be programmed to generate an interrupt when it is filled to a pre-determined level. Sampling The STMPE811 touch screen controller has an internal 180 kHz, 12-bit ADC able to execute autonomous driving/sampling. Each "sample" consists of 4 ADC readings that provide the X and Y locations, as well as the touch pressure. Figure 11. Sampling Active window Top right coordinates Bottom left coordinates ADC takes X reading Settling period Drive X ADC takes Y reading Settling period Drive Y |
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