Datasheet

SDA - I2C data pin, connect to your microcontrollers I2C data line.

A2, A1, A0 - These are the I2C address selection pins. By default the I2C address is

0x50. Connecting these pins to VCC and power cycling the chip will adjust the lower

three bits of the address. For example, if A0 is high, the address is 0x51. If A1 and A2

are high, the address is 0x56