Questions about the settings of BQ24610's termination charge current + pre-charge current + battery charge voltage

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Questions about the settings of BQ24610's termination charge current + pre-charge current + battery charge voltage [Copy link]

question:

BQ24610 "termination charge current / pre-charge current / battery charge voltage setting", I have a few questions to confirm with you:

1. Fully charged condition: charging current < termination charging current, 24610 determines that charging is complete, stat2 lights up

If the battery voltage rises to > the set battery charging voltage, 24610 determines that charging is complete and stat2 lights up.

"Charging current and battery voltage": What is the logical relationship between these two conditions? (If only one condition meets the set standard, will the 24610 show an abnormal state?)

2. Iterm: Is it the termination charging current?

①24610 manual page 26 Ipre-charge = Iterm = 0.3A (Does it mean: both the pre-charge current and the termination charge current can be set to 0.3A in the circuit through VISET2?)

②24610 manual page 16 Ipre-charge = VISET2/100XRSR (Does it mean: both the pre-charge current and the termination charge current can be set manually?)

③24610 manual page 17 "The minimum precharge/termination current is clamped to be
around 125 mA with default 10-mΩ sensing resistor." (Where does this prohibition of charging current of 125mA come from? Is 125mA fixed? Is there any contradiction with ②)

I hope you will reply. Please try to describe it in clear and understandable language.

answer:

1. Yes, the pre-charge current and the termination charge current can be set in the circuit through VISET2
. 2. The pre-charge current and the termination charge current can be set to the value you need.
3. If you use a 10mohm sense resistor, the minimum pre-charge current and the termination charge current that can be set is 125mA. If the current is smaller, the accuracy will be inaccurate.

Thanks for your reply! But I still have some questions unanswered:
1. According to the manual page 26, Ipre-charge = Iterm = 0.3A, connect an ammeter in series to the battery end to measure: Why is the charging still on when the charging current drops to 150mA? The monitoring shows that the charging is completed when it is close to 125mA. Why is this (the circuit is copied from the manual page 26)?
2. The decrease of charging current and the increase of VFB voltage: Which of these two conditions does the 24610 take as the judgment standard for "charging completion"? If only one condition meets the set standard, will the 24610 show an abnormal state?

Thanks for your reply! But I still have some questions unanswered:
1. According to the manual page 26, Ipre-charge = Iterm = 0.3A, connect an ammeter in series to the battery end to measure: Why is the charging still on when the charging current drops to 150mA? The monitoring shows that the charging is completed when it is close to 125mA. Why is this (the circuit is copied from the manual page 26)?
2. The decrease of charging current and the increase of VFB voltage: Which of these two conditions does the 24610 take as the judgment standard for "charging completion"? If only one condition meets the set standard, will the 24610 show an abnormal state?

I see, I used the wrong resistor, I used 5.1K for R6, and the measured ISET2 voltage was 0.16V.

martin0221

I learned a lot from you, thank you very much