SoC with M3 core in 3D stack solar powered sensor

A 3D integrated sensor system with an M3 microprocessor powered by solar cells with battery storage. It operates near threshold at 73kHz with the Wake-Up Interrupt Controller only bringing the core out of ultra-low leakage mode to take the necessary sensor readings. The system uses power gating and voltage scaling as well as custom SRAM was developed to minimize leakage power during sleep mode.