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MPR121 - 12 Channel Capacitive Touch Sensor Controller Module - I2C Interface

MPR121 - 12 Channel Capacitive Touch Sensor Controller Module - I2C Interface

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  • The operating voltage is 2.5v - 3.6v
  • 29μA supply current at 16ms sample period.
  • 3μA shutdown current
  • 12 electrodes
  • The operating temperature range is -40°C to +85°C. 

MPR121 - 12 Channel Capacitive Touch Sensor Controller Module - I2C Interface

The MPR121 12-Channel Capacitive Touch Sensor Controller Module is a capacitive touch sensor controller driven by an I2C interface. The chip can control up to twelve individual electrodes, as well as a simulated thirteenth electrode. This is a breakout board for NXP/ Freescale’s MPR121QR2. The MPR121 also features eight LED driving pins. When these pins are not configured as electrodes, they may be used to drive LEDs.

There a four jumpers on the bottom of the board, all of which are set (closed) by default. An address jumper ties the ADD pin to ground, meaning the default I2C address of the chip will be 0x5A. If you need to change the address of the chip (by shorting ADD to a different pin), make sure you open the jumper first. Jumpers also connect SDA, SCL and the interrupt pin to 10k pull-up resistors. If you don’t require the pull-up resistors you can open the jumpers by cutting the trace connecting them.

There is no regulation on the board, so the voltage supplied should be between 2.5 and 3.6VDC. The VREG pin is connected through a 0.1uF capacitor to ground, which means, unless you modify the board, you can’t operate the MPR121 in low-supply voltage mode (1.71-2.75VDC).

Pin Diagram of MPR121-12 Channel Touch Sensor Module:

Package Includes:

  • 1 x MPR121 - 12 Channel Capacitive Touch Sensor Controller Module
  • 2 x Pin Set

Specifications:

Operating voltage 2.5v - 3.6v
Number of Electrodes 12 electrodes
Dimensions  5 x 4 x 2 cms 
Weight  5 grams

Shipping & Returns

  • All orders confirmed before 3 pm IST are shipped on the
    same day, barring rare pickup delays on holidays or disturbances
  • Delivery time in Metro cities is 1-3 days, Others it is
    3-7 days. It varies based on location, reliant on courier services
  • Return window: 7 days from receipt unless stated
    otherwise. No refunds/replacements after
  • Returns only for non-working/damaged products are accepted
  • Initiate return requests to our customer service team via Support ticket or contact us at +91-8123057137
  • Refunds are processed within 3-4 working days post inspection and approval.

For more details, please check our Shipping and Return Policy

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1.How many touch pads can the MPR121 detect and measure? 

  • The MPR121 can detect and measure the electrical capacitance of up to 12 different touch pads or electrodes. It can detect and measure the electrical capacitance of up to 12 different touch pads or electrodes, which makes it suitable for use in applications that require multiple touch points such as touchscreens, keypads, and other human-machine interfaces.

2.What type of interface does the MPR121 use to communicate with other devices? 

  • The MPR121 uses the I2C interface to communicate with other devices. The MPR121 uses an advanced capacitive sensing technology that can detect even very small changes in capacitance, which allows for accurate and reliable touch detection.

3.What type of technology does the MPR121 use to detect touch? 

  • The MPR121 uses an advanced capacitive sensing technology that can detect even very small changes in capacitance, which allows for accurate and reliable touch detection.

4.What kind of applications is the MPR121 suitable for? 

  • The MPR121 is suitable for use in applications that require multiple touch points such as touchscreens, keypads, and other human-machine interfaces. It's a flexible module that can be used in a wide range of applications, from simple buttons and switches to more complex touch-sensitive devices.