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BQ24616 status signal issue

Rajesh Kaliyaperumal
Intellectual 930 points

Hello Everyone,

1) When the DC supply is turned off after the charge has been completed (Stat1- High ,Stat2 - Low) ,why charge IC is going to charge suspend state (Stat1- High ,Stat2 - High ). If this status signal is changing anonymously then how the host controller will know the exact stat of the charger IC and Make decision.

  Is it normal ? how can we avoid this ? because in application the user shall cut the input supply anytime.

2) Also can anyone explain Fast charge timer state when the charge is completed. How do we identify the timer has expiry ??

Regards

Rajesh 

  • 0
    TI__Expert 8690 points
    Hi Rajesh,

    1. The status goes into charge suspend because it is in sleep mode. There is a comparator (see page 7 of datasheet under Sleep comparator) where if Vcc<Vsrn+100mV, it will go into sleep. You can see Table 2 on page 22 which explains all the suspend criteria. This is used to prevent reverse discharge.

    You can use the /PG signal to determine if this is input related or another fault.

    2. When charge is complete the timer is disabled. The timer is only enabled if the status "charge in progress" and it times out if it takes too long, depending on the setting on TTC.

    Regards,
    Steven
  • 0 in reply to Steven Bangdiwala
    Intellectual 930 points

    Hi Steven ,

    Thanks for your information.