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QB24133 Fig 18 Batetry Detection Flow Chart

INg
Genius 3475 points
Other Parts Discussed in Thread: BQ24133

Hi Charles, fellow forum friends

Good day.

I would like to get some feedback on the Fig 18 Battery Detection Flow chart on the data sheet of BQ24133 on behalf of my customer.

My customer has done a setup similar to the guide on the EVB user guide.

On the e-load connected to the battery terminals, he is not able to measure the 8mA being sent across. Is the e-load able

  • to simulate the presence/absence of a battery
  • Does the 8mA terminate immediately (due to the e-load), which explains why the 8mA (for 1S) was not able to capture?
  • Would I be able to observe the 8mA if I replace the eload with a resistor, what values is recommended? 

Next question, in the event of a presence of a fully cahrged battery, could you advise the flow of the flow chart. There are three termination blocks in the flow chart. "Battery Absent" and 2x "Battery present, Begin charge". Ideally, when there is a fully charge battery the termination block should be  " Battery detected" only.

Ivan

  • 0
    TI__Mastermind 31120 points

    As per the flow chart the 8mA discharge turns off once the BAT pin pulls down to the LOWV threshold.

    Not sure of you second question.  The battery detection routine first applies a discharge to see if a battery is present to hold up the BAT pin.  If the BAT pin is not held up then it assumes that the battery protector could be open and applies a charge current to close the protector.  If the battery is present with an open protector the charge current should close the battery and keep the battery voltage stable (after protector closes).  If the battery is not present the BAT voltage will go above refresh and then continue to cycle between lowv and above refresh.

    The stat pin when flashing shows a fault.  The use has to determine which fault is present.