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BQ24171: About Timer Fault Recovery of BQ24171

Gk 110
Expert 2440 points
Part Number: BQ24171

Hello to whom it may concern.

 

The BQ24171 is designed to be cleared when certain conditions are met even if a timer fault occurs.

The data sheet has the following description.

 

(Datasheet p23)

 - 9.3.21 Timer Fault Recovery

   The IC provides a recovery method to deal with timer fault conditions. The following summarizes this method:

   Condition 1: The battery voltage is above the recharge threshold and a time-out fault occurs.

   Recovery Method: The timer fault will clear when the battery voltage falls below the recharge threshold, and

   battery detection will begin. A POR or taking ISET below 40 mV will also clear the fault.

 

(Question)

 1, Why is the BQ24171 designed to clear automatically even if a timer failure occurs?

 

I think that it is common that the timer fault is cleared by turning on the power again and attaching / detaching the battery.

The BQ24171 is JEITA compliant.

Therefore, is it designed that it is safe to clear timer fault automatically and start recharging?

 

Could you please answer？

 

Best regards,

 

 Gk110

  • 0
    TI__Intellectual 1980 points

    Hello,

    The setting is OK and reasonable. You can see below:

    "The IC provides a recovery method to deal with timer fault conditions. The following summarizes this method:

    Condition 1: The battery voltage is above the recharge threshold and a time-out fault occurs.

    Recovery Method: The timer fault will clear when the battery voltage falls below the recharge threshold, and

    battery detection will begin. A POR or taking ISET below 40 mV will also clear the fault.

    Condition 2: The battery voltage is below the recharge threshold and a time-out fault occurs.

    Recovery Method: Under this scenario, the IC applies the fault current to the battery. This small current is used

    to detect a battery removal condition and remains on as long as the battery voltage stays below the recharge

    threshold. If the battery voltage goes above the recharge threshold, the IC disabled the fault current and

    executes the recovery method described in Condition 1. A POR or taking ISET below 40 mV will also clear the

    fault.

    "

    when "The battery voltage is above the recharge threshold and a time-out fault occurs", after the battery discharge to load, and then the voltage is below recharge voltage, battery should be charged again.

    And for your concern, you could see "Condition 2: The battery voltage is below the recharge threshold and a time-out fault occurs.". if your battery cannot be charged fully, it means there maybe a problem, so charger will not charge again.

    Regards

  • 0 in reply to Kerry Song
    Expert 2440 points

    Hello Kerry-san

     

    Thanks for your prompt reply.

     

    I want to know that the BQ24171 designed to recharge automatically.

    Is it because BQ24171 certainly stops if there is an abnormality in the battery detection flow even after recharging starts?

     

    Best regards,

     

    Gk110

  • 0 in reply to Gk 110
    TI__Intellectual 1980 points

    Hello,

    when BQ24171 start recharge, most of the feature is like charge, there is no issue about it. Could you describe your question clearly if there is other question, thanks.

    Regards