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BQ24105-Q1: About OPERATIONAL FLOW CHART

Koji Hayashi92
Mastermind 7030 points
Part Number: BQ24105-Q1

Hi TI-team

My customer has some question about OPERATIONAL FLOW CHART

Would you give me an answer ?

 

1, About the judgment criteria of "VBAT＜VLOWV" when "FSTCHG Timer Expired ?" is No.

   If it is VLOWV, i think the threshold voltage of the precharge judgment standard.

   Isn't it a mistake of VOREG-VRCH ?

2, In this flow chart, it seems that it will not return to the recharging flow (the beginning of the flow) unless it detects that the battery has been removed from the state that charging is completed.

   If the voltage drops due to discharge even if the battery is not removed, will it return to the recharge flow ?

   Will it not be recharged without "POR" ?

3, About each “Suspend Charge” on the flowchart

   Is the waiting time fixed ?

4, About "ITERM detection?"

   If the charge termination current (ITERM) cannot be detected after charging and the result is "No",

   does it mean that the loop of "Regulate Current or Voltage" -> "TS Pin in LTF to TCO Range ?" -> "FSTCHG Timer Expired ?" -> "VBAT<VLOWV" -> "ITERM detection ?" are continued until "POR" ？

 

Best Regards,

Koji Hayashi

  • 0
    TI__Mastermind 40325 points

    Dear Koji,

    1. This part of the flowchart demonstrates that if the FSTCHG timer has not expired, the state machine will next see if the battery is below VLOWV. If it is, pre-charge will restart. If it is not, the part will try and detect termination.

    2. If the part dips below the recharge threshold, the charger will return to the start of the flow.

    3. All of the "Suspend charge" refer to temperature qualification. This time is not fixed and charge will remain suspended until the voltage on the TS pin returns to the correct level.

    4. If termination is not detected, the part will continue to charge until it does following the blocks you indicated. It will then stay in "Charge Complete" until the voltage drops below the recharge threshold.

    Thanks,

    Mike Emanuel

    Please click "This resolved my issue" button if this post answers your question.

  • 0 in reply to Michael Emanuel35
    Mastermind 7030 points

    Hi Mike-san

    Customer have a question about answer 1.

    Please see OPERATIONAL FLOW CHART.xlsx.

    OPERATIONAL FLOW CHART.xlsx

    The condition of "VBAT> VLOWV" has already been met in the precharge flow in the red line, but why do FST charge until the ICHARGE current becomes "VBAT> VLOWV" in the flow in the blue line ?

    Since the condition of "VBAT> VLOWV" cannot be satisfied within 30 min in the precharge flow, it can be understood if it is charged until "VBAT> VLOWV" in the quick charge flow, but this flow does it haven't.

    In the data sheet, VLOWV is described as "Transition voltage threshold from precharge to fast charge".

    Since it has already switched to quick charge, isn't it different to judge the completion of charging by the threshold of VLOWV ?

     

    Best Regards,

    Koji Hayashi

  • 0 in reply to Koji Hayashi92
    TI__Mastermind 40325 points

    Koji-san,

    The first check of the box "VBAT<VLOWV" determines if the part is in fast-charge or pre-charge. If you are in pre-charge and the 30 min timer expires, the charger is turned off and a fault is generated. The part will not charge again until POR or battery replacement.

    Fast charge will continue in the blue line as long as VBAT>VLOWV. If you are in the blue line, the pre-charge timer does not apply and only the fast-charge timer applies. The completion of fast-charging is not determined by VLOWV, it is determined by the termination detection.

    Thanks,

    Mike Emanuel

    Please click "This resolved my issue" button if this post answers your question.