BQ2002F charging termination issue

I cannot read your entire post because the sentences are not wrapping around properly.  Please use the 'paste from word' button to properly insert your text into these posts.

It is difficult to judge the charge time without exactly knowing the initial charge status of the pack.  Additionally, temperature, the age of the pack, part tolerances, etc. will affect the charge time.

Hi,

In the last months I introduce a Bq2002F in my design to charge 
NiMH batteries (4cells; TM=mid and C/2 rate).

I control the entire system with a uC and there aren't problem 
to reset the bq2002F in case of a temperature fault
and understand when your device does a complete charging cycle 
that correspond to a battery fully charged.

In the past I didn't a complete discharge of the pack so the 
charging cycles were brief.

In the last days I noticed that my 2100mA battery pack ends the 
fast charge in 40 minutes at 0.9A ca. Why does it trigger a 
charging termination, before the right time?
I know It could terminate before beacuse I can't reach the 
nominal capacity but 40'..... I'm worried...
Best regards

Thanks for reposting with corrected formatting.

It is best if you know exactly what capacity your pack is at when starting charging, exactly how much current is flowing into the pack during charging, and how your pack's capacity vs. charge time/voltage/current curve looks.  For example, the charge current may have a significant tolerance associated with it resulting in a higher fast charge current that charges your pack quicker.  Or your pack might need a lot of extra time in top off charge to reach full capacity.  It may be best to consult your battery manufacturer and/or to look at the pack's actual current/voltage waveforms.