Open AccessEvent Driven Time-logging System based on Continuous Operation of Real Time Clock towards Perpetual Electronics
Author(s) -
Shunsuke Yamada,
Hiroshi Toshiyoshi
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1407/1/012045
Subject(s) - standby power , power (physics) , battery (electricity) , event (particle physics) , computer science , electrical engineering , electronics , energy harvesting , embedded system , power management , sleep mode , real time computing , power consumption , voltage , engineering , physics , quantum mechanics
This paper presents a novel time logging system using a real time clock (RTC) powered by a vibrational energy harvester to record the time of events when piezoelectric PVDF film as an event-driven sensor is activated. The power-management circuit normally remains in the sleep mode to cut power supply to the micro-processor and the ferroelectric random access memory. On the other hand, the RTC alone is powered by a battery to keep the time by seamless operation, which lowers the standby power consumption as small as 231 nW. As the PVDF film generates power, the developed power management circuit can supply load current upwards of 8 mA at 3.3 V dc for external circuit to record the time of events with the energy consumption of 467 µ J.