Capacitive MPR121 Touch Breakout - 12 Input

  • Product Code: MPR121-MOD
  • Location: X281 / R58
  • Availability: In Stock
  • R199.00 (price excl. VAT)


Capacitive MPR121 Touch Breakout - 12 Input

This is a breakout board for the Freescale MPR121QR2. The MPR121, driven by a capacitive touch sensor control i2c interface 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 needles are not configured as electrodes, they can be used to drive LEDs. There is a jumper under four directors, and all of these sets are off by default.

Quick Spec

  • Chipset: Freescale MPR121QR2
  • Supply Range: 1.71 V to 3.6 V
  • Supply current at 16 ms sampling interval period: 29 μA
  • Stop mode current: 3 μA
  • Inputs: 12
  • Interface: I2C with Interrupt output
  • I2C Address Range: 0x5A - 0x5D

I2C Addressing

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.

Resources

Shipping List

  • 1 x Breakout MPR121 V12 Proximity Capacitive Touch Sensor


Tags: mpr121, 12, channel, touch, i2c

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