MPR121QR2 - 

Capacitive Touch Sensor, I2C, 1.71 V, 3.6 V, QFN, 20 Pins, -40 °C

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Product Overview

The MPR121QR2 is a proximity capacitive Touch Sensor Controller. The MPR121 features an increased internal intelligence plus NXP'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 auto-configuration. 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.
  • 29μA Typical run current at 16ms sampling interval
  • 3μA in scan stop mode current
  • 12 Electrodes/capacitance sensing inputs in which 8 are multifunctional for LED driving and GPIO
  • Integrated independent auto calibration for each electrode input
  • Auto configuration of charge current and charge time for each electrode input
  • Separate touch and release trip thresholds for each electrode
  • I²C interface, with IRQ interrupt output to advise electrode status changes


Computers & Computer Peripherals, Consumer Electronics, Security, Lighting


ESD sensitive device, take proper precaution while handling the device.

Product Information

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MSL 3 - 168 hours
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