MPR121 OVERVIEW
The MPR121 is the second generation capacitive touch sensor controller after the initial release of the MPR03x series devices. The MPR121 features increased internal intelligence, some of the major additions include an increased electrode count, a hardware configurable I2C address, an expanded filtering system with debounce, and completely independent electrodes with auto-configuration built in. The device also features a 13th simulated sensing channel dedicated for near proximity detection using the multiplexed sensing inputs

Implementations
General Purpose Capacitive Detection
 Switch Replacements
 Touch Buttons
 Touch Keypad
 Touch Slide bar
 Touch Wheel
 Touchpad
 Touch Panel
 Near Proximity Detection
Typical Applications
 PC Peripherals
 MP3 Players
 Remote Controls
 Mobile Phones
 Lighting Controls