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BQ24630 TTC Timing inaccurate

Other Parts Discussed in Thread: BQ24630

Hello,

we use the BQ24630 to load 2 cell Li-FePo battery (10Ah).

The system works good, but we have a problem with the Timing of the TTC Counter.

If we use the 110nF condensator, as described in the datasheet, the charging is terminated

after 15 minutes. If we use 220nF we only get ~30minutes, STAT1 and STAT2 LED are off.

If we use 470nF we get nearly an hour before the TTC cuts the charching.

According the information in the datasheet i should get a 2,5h Timer with 110nF?

If we put the TTC-Pin to VCC, the BQ24630 load the LiFePos completely and

the STAT2 LED indicates a full battery.

Is there any problem known with the calculation or accuracy of the TTC?