Your next smart lock could ditch the battery by harvesting energy from your phone - The Verge

Infineon’s NAC1080 is a chip designed to let smart locks harvest the energy from your phone over NFC to both power their motors and authenticate with them

One of the magical things about near-field communication technology (NFC) is that tags don’t need a battery to communicate — you’ll never need to buy a new coin cell for your employee badge, because the badge scanner wirelessly beams enough power to the badge to verify it’s legit. Now, chipmaker Infineon wants to make the same thing happen with smart locks — ones that can be entirely powered by your phone.

You can already buy fancy door locks in Europe and basic padlocks in China that do the trick, with Finland’s iLOQ claiming to have been the first to do it back in 2016. But today, Infineon is selling a new chip and offering full detailed instructions (PDF) to anyone who wants in on the idea.

It’s called the NAC1080, and it’s designed to be a single chip that does practically the whole thing. It’s got circuits to recognize your NFC phone, harvest its power, and drive the smart lock’s motor. And it’s got both embedded security features and a 32-bit ARM Cortex M0 CPU to verify that you and your phone are allowed to open and close the lock in question. All of that while running on the teensy charge your phone can provide.

https://www.theverge.com/2022/7/22/23273845/infineon-smart-lock-nfc-energy-harvesting-nac-1080


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