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MPR121 Module

img_mpr121

  • 3.3V: Power supply

  • IRQ: Open Collector Interrupt Output Pin, active low

  • SCL: I2C Clock

  • SDA: I2C Data

  • ADD: I2C Address Select Input Pin. Connect the ADDR pin to the VSS, VDD, SDA or SCL line, the resulting I2C addresses are 0x5A, 0x5B, 0x5C and 0x5D respectively

  • GND: Ground

  • 0~11: Electrode 0~11, electrode is a touch sensor. Typically, electrodes can just be some piece of metal, or a wire. But some times depending on the length of our wire, or the material the electrode is on, it can make triggering the sensor difficult. For this reason, the MPR121 allows you to configure what is needed to trigger and untrigger an electrode.

MPR121 OVERVIEW

The MPR121 is a second-generation capacitive touch sensor controller, succeeding the MPR03x series. It offers enhanced internal functionality and significant new features, including:

  • Support for a higher number of electrodes

  • A hardware-configurable I2C address

  • An improved filtering system with built-in debounce functionality

  • Fully independent electrodes with automatic configuration capabilities

Additionally, the MPR121 includes a 13th simulated sensing channel specifically designed for near-proximity detection, utilizing the multiplexed sensing inputs.

Features

  • Low power operation

    • 1.71 V to 3.6 V supply operation

    • 29 μA supply current at 16 ms sampling interval period

    • 3 μA Stop mode current

  • 12 capacitance sensing inputs

    • 8 inputs are multifunctional for LED driver and GPIO

  • Complete touch detection

    • Auto-configuration for each sensing input

    • Auto-calibration for each sensing input

    • Touch/release threshold and debounce for touch detection

  • I2C interface, with Interrupt output

  • 3 mm x 3 mm x 0.65 mm 20 lead QFN package

  • -40°C to +85°C operating temperature range

Example