The NFC chip I want still doesn't exist: a CPU and flash I can write a program for, directly, no VMs, no Java, without an NDA'd datasheet.
These exist, but they're all behind NDAs and you're not allowed to have them. They're used for e.g. EMV.
These exist, but they're all behind NDAs and you're not allowed to have them. They're used for e.g. EMV.
I think it's a M24LR04E.
Costs like $0.50.
I think these could be useful for devices where you have a limited amount of data you want to read or transfer. Like why have bluetooth and all the crap that entails when all you want to do is configure a device once.
Advantage of a separate IC is you can use it with whatever microcontroller development stack you have working.
More generally what I'm seeking is something in the card form factor which is suitable to store cryptographic secrets (i.e., a smartcard).
Separate IC is a disadvantage here since it creates a vulnerable security boundary and makes it infeasible to integrate the chip into a thin card.