I think it makes sense to assume they have a hall-effect sensor and a MOSFET but of course maybe they combined both in a single package. Thinking how a hall-ef

I think it makes sense to assume they have a hall-effect sensor and a MOSFET but of course maybe they combined both in a single package. Thinking how a hall-effect sensor works, perhaps it would be possible to embed it in a wafer with some gates and you're done.