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Power Management for Energy Harvesting Slide 16

Typical specifications for active and sleep current are 1 mA and 1 µA, respectively. Approximately 6 µA, mostly dominated by the active current, is the calculated current, based on one half of a percent duty cycle. At this duty cycle, reducing the sleep current by 5 times has little impact on the overall current, however, reducing the active current by 5 times does have meaningful impact on the overall current consumption. These results also show that increasing the sleep current above 1 µA will begin to significantly impact the total current dissipation. Keep in mind that the sleep current is not just the sleep current of the CPU and associated peripherals, it also includes the energy harvesting interface and power management, which in most cases will always be active.

PTM Published on: 2011-12-02