MPR121 (12 Key) Capacitive Touch Sensor
MPR121 Capacitive Touch Sensor is the second generation sensor controller following the initial release of the MPR03x series of devices. The MPR121 features increased internal intelligence plus Freescale’s second-generation capacitance detection engine. Some major enhancements include an increased electrode count, a hardware configurable I2C address, an expanded filtering system with debounce, and completely independent electrodes with built-in autoconfiguration. The device also features a 13th simulated electrode which represents the simultaneous charging of all the electrodes connected together. When used with a touch panel or touch screen array, the 13th simulated electrode allows a greater near proximity detection distance and an increased sensing area.
Features: MPR121 Capacitive Touch Sensor Module
- Connection Interface: I2C.
- Operating Voltage: 2.5-3.6 VDC
- Application: Capacitive Touch Sensor Controller
- Number of touches inputs:12
Description
MPR121 Capacitive Touch Sensor has support for only I2C, which can be implemented with nearly any microcontroller. You can select one of 4 addresses with the ADDR pin, for a total of 48 capacitive touch pads on one I2C 2-wire bus. Using this chip is a lot easier than doing the capacitive sensing with analog inputs: it handles all the filtering for you and can be configured for more/less sensitivity.
This sensor comes as a tiny hard-to-solder chip so we put it onto a breakout board for you. Comes with a fully assembled board, and a stick of 0.1″ header so you can plug it into a breadboard. For contacts, we suggest using copper foil or parallax, then solder a wire that connects from the foil pad to the breakout.
Add lots of touch sensors to your next microcontroller project with this easy-to-use 12-channel capacitive touch sensor breakout board, starring the MPR121. This chip can handle up to 12 individual touchpads.
Features and Specifications – MPR121 Capacitive Touch Sensor
- 1.71 V to 3.6 V operation
- 12 electrodes
- I2C interface, with optional IRQ output to advise electrode status changes
- LED driver functionality with a maximum of 8 LEDs
- Uses I2C 7-bit address 0x5A (can be set to 0x5B, 0x5C or 0x5D)
Features: MPR121 Capacitive Touch Sensor
• 1.71V to 3.6V operation
• 29 μA typical run currently at 16 ms sampling interval
• 3 μA in scan stop mode current
• 12 electrodes/capacitance sensing inputs in which 8 are multifunctional for LED driving and GPIO
• Integrated independent autocalibration for each electrode input
• Autoconfiguration of charge current and charge time for each electrode input
• Separate touch and release trip thresholds for each electrode, providing hysteresis and electrode independence
• I2C interface, with IRQ Interrupt output to advise electrode status changes
• 3 mm x 3 mm x 0.65 mm 20 lead QFN package
• -40°C to +85°C operating temperature range Implementations
• General Purpose Capacitance Detection
• Switch Replacements
• TouchPads, Touch Wheel, Touch Slide Bar, Touch Screen Panel
• Capacitance Near Proximity Detection.
Applications: MPR121 Capacitive Touch Sensor
• PC Peripherals
• MP3 Players
• Remote Controls
• Mobile Phones
• Lighting Controls
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