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bq40z50 finish discharge

Other Parts Discussed in Thread: BQ40Z50

In which conditions bq40z50 stops the discharge of cells (stop the DSG FET) ?

My setup is that TD and FD will set/reset  only based on cell voltage , not on RSOC. 

I have let my battery ( 3 series cell) to discharge, TD FD set accordingly   , but the discharge continued until CUV protection occured. 

That  ( protection) is the only way to stop the discharge? 

Are TD ,FD just flags? Do they influence the FET control in any way?  If they are just flags why there are two of them?