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.

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OkaeYa MPR121 Breakout V12 Capacitive Touch Sensor Controller Module I2C Keyboard

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