Persistent Clocks for Batteryless Sensing Devices
Persistent Clocks for Batteryless Sensing Devices
复制标题
DOI：
10.1145/2903140
复制
发表时间：
2016-08-01
影响因子：
2
通讯作者：
Sorber, Jacob
中科院分区：
文献类型：
--
作者：
Hester, Josiah;Tobias, Nicole;Sorber, Jacob
传感平台正在变得无电池，以实现物联网的愿景，数万亿台设备收集数据，相互交互，并与人互动。然而，这些无电池传感平台--纯粹依靠能量收集--很少能够在断电后保持时间感。这使得处理对时间敏感的传感器数据特别困难。我们提出了两种新颖的零功率计时器，使用剩磁衰减来测量断电之间的时间。我们的方法计算的电容设备，无论是片上静态随机存取存储器（SRAM）或专用电容器的衰减量的时间。这使得沙漏状计时器能够为间歇供电的传感设备提供持久的时间感。我们的评估表明，应用程序使用任何计时器可以保持时间准确地通过电源故障长达45秒，低开销。
Sensing platforms are becoming batteryless to enable the vision of the Internet of Things, where trillions of devices collect data, interact with each other, and interact with people. However, these batteryless sensing platforms-that rely purely on energy harvesting-are rarely able to maintain a sense of time after a power failure. Thismakes working with sensor data that is time sensitive especially difficult. We propose two novel, zero-power timekeepers that use remanence decay to measure the time elapsed between power failures. Our approaches compute the elapsed time from the amount of decay of a capacitive device, either on-chip Static Random-Access Memory (SRAM) or a dedicated capacitor. This enables hourglass-like timers that give intermittently powered sensing devices a persistent sense of time. Our evaluation shows that applications using either timekeeper can keep time accurately through power failures as long as 45s with low overhead.