SLUS987C January 2011 – December 2019 BQ33100
PRODUCTION DATA.
Capacitance represents the total capacitance in the capacitor array and presents the value in units of F (Farads) to 1 decimal place.
On initialization, the BQ33100 sets Capacitance to the data flash value stored in Initial Capacitance. During subsequent learning cycles, the BQ33100 updates Capacitance with the last measured capacitance of the capacitor array. Once updated, the BQ33100 writes the new Capacitance value to data flash to Capacitance. Capacitance represents the full super capacitor reference for relative state-of-charge calculations.
InitialCapacitance—This is the first updated value of super capacitor capacitance and represented in units of F.
RelativeStateOfCharge (RSOC)—This represents the % of available energy. Use Equation 3 to calculate the RSOC.
Learning Frequency—The Learning Frequency register sets the time between automatic learning cycles of the super capacitor, which can also be manually executed by issuing a ManufacturerAccess Learn command. The BQ33100 uses the learning cycles to measure the super capacitor capacitance and update the Capacitance register accordingly. When the BQ33100 is in UNSEALED mode then a value of 250 is used to set the learning Frequency to 10 minutes for test purposes.