User manual for APPEB1012 Revision 1.2, Oct 2019
Solar Energy Harvesting Supercapacitor Evaluation Board using a
PMIC with MPPT
© CAP-XX Pty Limited 2019 | Tel +61 2 9420 0690 | www.cap-xx.com
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Status Pins
Users are also given access to the STATUS[2:0] logic output levels on the status pins if required.
The status pin STATUS[0] turns high when the supercapacitor voltage reaches Vchrdy to signal
that the LDOs are operational and can be enabled.
If the supercapacitor voltage gets discharged below Vovdis, the LDOs are gated OFF and the
boost converter on the AEM10941 is no longer supplied by the storage element to protect it from
further discharge. When Vscap drops below Vovdis STATUS[1] changes from low to high, to warn
that the system will soon shut down, and ~600ms later, when shutdown occurs, STATUS[1] and
STATUS[0] both go from high to low. This is illustrated in figure 10.
Figure 10: Example STATUS pin operation
The status of the MPP controller is reported with one dedicated status pin (STATUS[2]). The
status pin is asserted when the input is set open circuit to measure V
OC
of the energy harvester.
Further Information
CAP-XX will be pleased to provide further information on the applications described here, and on
the use of supercapacitors in any application. Please use the contact details provided on the CAP-
XX web site (
www.cap-xx.com
).
This user manual is available on the CAP-XX web site. On the web site you may also find product
bulletins, datasheets, SPICE models, application white paper, application briefs and design-aid
calculator (
http://cap-xx.com/resources/resources.htm
).
