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When I reset BQ20ZXX chip the FCC value doesn't change while the other values are changed
Updated:2011.02.14 Source:xitonghan Clicks:
 
Q. When I reset BQ20ZXX chip the FCC value doesn't change while the other values are changed.
A. Yes. To change FCC in this chip you need to perfom calibrating cycle. Texas Instruments recommendation:
The learning cycle process for an Impedance Track gauge is highly recommended, as it updates parameters that allow for more accurate gauging. In order to increase this accuracy, TI recommends at least 2 hours rest after a charge cycle or at least 5 hours rest after a discharge cycle. This rest period allows the battery cells to relax to a stable voltage, which is required for an accurate open circuit voltage (OCV) reading. The Impedance Track gauge requires two OCV readings to update the Qmax parameters. It is probable that the battery voltage will stabilize quite a bit before the 2 hour and 5 hour periods, but some batteries do take longer than others. Since accurate OCV readings during learning are so critical, the rest periods were chosen as they are.