The Cortex-M0+ chip is capable of 32-bit processing, measures 1mm x 1mm, and is based on Flycatcher architecture. ARM says it’s the world’s most energy-efficient design. It’s even more efficient than the 8- and 16-bit MCUs it’s replacing.
The idea is that if the “Internet of Things” — that near-future sci-fi aspiration where your toaster knows when your dishwasher is using too much power — is ever going to happen, we’ll need super low power chips to make it possible. [ARM via Geek, BBC]