DESCRIPTION
When using a non-rechargeable primary battery the EM8500's onboard PMU offers a mechanism to extend battery life when assisted by a harvesting element. The EM8500 incorporates a boost converter able to start with an input voltage as low as 300 mV and an input power of few μW. In functional mode the EM8500 operates at energy levels from a DC harvesting source as low as 100 mV and 1 μW. To maximize harvesting efficiency the EM8500 integrates a programmable maximum power point tracking controller. The EM8500 is capable of working with a variety of energy elements as secondary storage, namely re-chargeable batteries, supercapacitors or conventional capacitors. In all cases the EM8500 maintains its fast start-up capability that depends only on the harvester conditions and the STS capacitor value. A USB connection to an external power source is available on the EM8500 for fast charge of the long term storage element. The EM8500 integrates voltage supervisory functions. Minimum and maximum voltages are controlled on the LTS element to prevent damage to the energy storage element.
EM Microelectronic
