Title :
Millimeter-scale nearly perpetual sensor system with stacked battery and solar cells
Author :
Chen, Gang ; Fojtik, Matthew ; Daeyeon Kim ; Fick, David ; Junsun Park ; Mingoo Seok ; Mao-Ter Chen ; Zhiyoong Foo ; Sylvester, Dennis ; Blaauw, D.
Author_Institution :
Univ. of Michigan, Ann Arbor, MI, USA
Abstract :
An 8.75 mm3 sensor system is implemented with a near-threshold ARM Cortex-M3 core, custom 3.3 fW leakage-per-bit SRAM, two 1 mm2 solar cells, a thin-film Li-ion battery, and an integrated power management unit. The 2.1 ¿W system enters a 100 pW data-retentive sleep state between sensor measurements and harvests energy from the solar cells to enable nearly perpetual operation.
Keywords :
SRAM chips; energy harvesting; microprocessor chips; microsensors; secondary cells; solar cells; data-retentive sleep state; millimeter-scale nearly perpetual sensor system; power 100 pW; power 2.1 muW; power 3.3 fW; sensor measurements; solar cells; stacked battery; Battery charge measurement; Battery management systems; Energy management; Energy measurement; Photovoltaic cells; Power system management; Random access memory; Sensor systems; Sleep; Thin film sensors;
Conference_Titel :
Solid-State Circuits Conference Digest of Technical Papers (ISSCC), 2010 IEEE International
Conference_Location :
San Francisco, CA
Print_ISBN :
978-1-4244-6033-5
DOI :
10.1109/ISSCC.2010.5433921
