Datasheet

My shield doesn't work with my LED backpack.
Some backpacks have a default address of 0x70. This is the "all call" address of the controller chip on the motor
shield. If you re-address your backpack, it will work with the shield.
© Adafruit Industries https://learn.adafruit.com/adafruit-motor-shield-v2-for-arduino Page 9 of 43