The MPR121 is the second generation sensor controller after the release of the MPR03x series devices. The MPR121 features:
- Increased internal intelligence in addition to a second generation capacitance detection engine
- An increased electrode count, hardware configurable I2C address, expanded filtering system with debounce and completely independent electrodes with built in auto configuration
- A 13th simulated electrode that represents the simultaneous charging of all the electrodes connected together to allow for increased proximity detection in a touch panel or touch screen array
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