![]() ![]() The time when the voltage of the super cap drops from 5.5 V to 3.0 V, Load acts as a constant current sink over the voltage range, if weĪverage out the active and sleep state current consumptions. This sets the usable voltage range of the cap between 3 V and 5.5 V. voltage of DS18B20 is 3.0 V, so 3.0 V LDO regulator with a low quiescent current could power everything in this module. Just by looking at the operating voltage ranges of every component, the max. Just for simplicity, I also left out the energy harvesting IC with solar cell MPPT tracking and buck-boost SMPS output. Gecko EFM32 would have provided a lot smaller current consumption. I also wanted to use an 8-bit AVR microcontroller at least for this revision, although for ex. ![]() The sensor module would run almost forever with AA batteries but that would have been way too boring, so I used a super cap & solar cell combination to learn something new about the power management optimization, sleep modes and current measurement techniques. ![]()
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