8.6.1 Device Address

Following a start condition, the bus master must output the address of the slave it is accessing. The address of the TCA9545A is shown in Figure 14. To conserve power, no internal pullup resistors are incorporated on the hardware-selectable address terminals, and they must be pulled high or low.

Figure 14. TCA9545A Address

The last bit of the slave address defines the operation to be performed. When set to a logic 1, a read is selected, while a logic 0 selects a write operation.