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I'm surprised this isn't custom silicon? I thought the U1 chip was required and Apple made?

U1 is only the UWB wireless interface.

It likely still includes a small micro thats sufficient.

But you need something for the DAC/Speaker and Bluetooth LE, so that may have influenced adding another micro.

Seems like there's an nRF52.

Kinda surprising Apple uses such a common bit of hardware. What's next - the next MacBook battery controller Arduino controlled?