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

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

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  • Operating voltage: 2.5v - 3.6v

  • 29μA supply current at 16ms sample period

  • 3μA shutdown current

  • 12 electrodes

  • Operating temperature range: -40°C to +85°C 

Related Tags
Pressure/Touch
Sensors

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

This is a breakout board for NXP/ Freescale’s MPR121QR2. The MPR121 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. 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).

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