MPR121:
NXP MPR121 Proximity Capacitive Touch Sensor Controller features 12 electrodes with an independent calibration feature. The independent calibration simplifies designing touch applications for portable low-power electronic products. This NXP proximity capacitive touch sensor controller builds on the MPR031 proximity touch sensor, adding an updated configuration system without increasing complexity. MPR121 also includes a hardware configurable I²C address, an expanded filtering system with debounce, and independent electrodes with autoconfiguration built in. A 13th simulated electrode represents the simultaneous charging of all the electrodes connected together to allow for increased proximity detection in a touch panel touch screen array.