JAJSN80E August 2009 – May 2022 TCA9535
The TCA9535 features 3 hardware address pins (A0, A1, and A2). The user selects the device I2C address by pulling each pin to either VCC or GND to signify the bit value in the address. This allows up to 8 TCA9535 devices to be on the same bus without address conflicts. See the Functional Block Diagram for the 3 address pins. The voltage on the pins must not change while the device is powered up in order to prevent possible I2C glitches as a result of the device address changing during a transmission. All of the pins must be tied either to VCC or GND and cannot be left floating.