The capacitance sensor detection controller companioned with one ITO film screen module to implement multi-touch functionality. It integrates one single electrode capacitance-to-digital converter (CDC), 16-bit high performance RISC CPU, flexible memory support, and many powerful hardware functions. The internal CDC has one automatic calibrate and compensates engine to remove environmental change effect. It also includes one self-learning circuit that can modify the threshold and sensitivity levels automatically to eliminate the impact of different finger sizes to optimize the finger touch detection. The chip includes one 16-bit RISC CPU to calculate the location of the finger touch and handle all data translation. It also includes one 16-bit MAC and one 32-bit divider hardware accelerators to speed up the location calculation. To supports one interrupt output that can be used to indicate the finger location has been changed or some user defined actions. The chip supports many flexible internal memory sizes and types, storing the user program and special data to extend special functions so as to meet users’ specific requirements. This chip can reduce the system cost by one supported internal power-on reset generator and one calibrated oscillator, generates 1 MHz, 6 MHz, and 24 MHz clocks.
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OVERVIEW
