Hi, I still don't understand the need to include the security IC on its own I2C bus. The I2C protocol is setup to allow for multiple slave devices on the same bus. This way, you could use one of the already existing I2C ports instead of going with a device that has 4 or creating a new one via software. Adding the security IC to an already existing I2C bus is the route I highly recommend unless there are other circumstances keeping you from having multiple slaves on the same bus. Now, there are a few devices out there with 4 I2C ports that can be used, but as with anything it comes with trade-offs (memory, RAM, LCD, etc.). So if you decide to go this route you'll need to weigh your options: Device Comparison It may be helpful if you describe all the specifications of the I2C communication you're trying to achieve in order to pick the right part. Best regards, Caleb Overbay
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