I'm trying to connect 32 I²C "root of trust" NXP A71CH devices.
- I'm thinking about a good way that does that, I mean what kind of communication should I use?
- A digital multiplexer that selects a device? but based on what?
- switching on the VDD source? but that needs reinitialization of the device and that takes time.
Answer
Really short: I²C with a bus multiplexer; this is a common problem and it's solved with a bus multiplexer.
However, seriously, the point of having a root of trust is having one root of trust, not 32; hence, your project requirements make me suspect you're either building a test rig for these devices, or you're testing a device that is supposed to work with one of these devices, or you've misunderstood your project requirements.
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