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BQ24210: BQ24210 Application Question

Kuo John
Expert 1075 points
Part Number: BQ24210

Hi Team,

I plan use bq24210 design solar charger application IOT. But have some question need you help.

1. When Battery Trackink mode, VDMP floating. VBUS DPM threshold which describe is right?
Section 7.5 Electrical Characteristics write BAT+100 mV (BAT>3.6 V) or 3.75 V (BAT≤3.6 V).
Section 8.3.1 write typically BAT+100 mV (BAT>3.65 V) or 3.75 V (BAT≤3.4 V).

2. When BAT drops below the pre-charge to fast-charge threshold VLOW(2.5V). Which describe is right?
7.5 Electrical Characteristics write 20% x ICHG
8.4.5.5 BAT Output write 10% typ x ICHG

3. LPCM for Solar charger suitable since should be avoid pre-charge and fast-charge timeout cause IC shut down, right?

4. Termination current threshold value, which describe is right? below is different condition?
7.5 Electrical Characteristics describe is 12%.
8.4.5.7 Termination describe is 14%.

5. Why we need "Batteries that have relaxed many hours may take several minutes to taper to the termination threshold and terminate charge."?

6. BAT < BAT(SC) mean bq24210 into LPCM mode, right? LED on/off show what behavior?


7. I would appreciate it if you can explain below fig.

  • 0
    Expert 1075 points
    Hi Team,

    Could you help update question? thanks.

    Regards,
    John
  • 0 in reply to Kuo John
    TI__Guru* 75786 points
    This Post contains 7 questions and reply will be split into separate replies.

    Q1. When Battery Trackink mode, VDMP floating. VBUS DPM threshold which describe is right?
    Section 7.5 Electrical Characteristics write BAT+100 mV (BAT>3.6 V) or 3.75 V (BAT≤3.6 V).
    Section 8.3.1 write typically BAT+100 mV (BAT>3.65 V) or 3.75 V (BAT≤3.4 V).

    A1. The Electrical Characteristics table is correct.
    When VDPM pin is float (open) Battery Tracking Mode is enabled. For battery voltage less than or equal to 3.6V the VBUS DPM point is set to 3.7V (3.65V min and 3.75V max). When battery voltage is above 3.6V the VBUS DPM set point is change to BAT + 100mV or 100mV above battery voltage. The range of 100mV is 70mV min to 145mV max.
  • 0 in reply to Bill Johns
    TI__Guru* 75786 points
    This Post contains 7 questions and reply will be split into separate replies.

    Q2. When BAT drops below the pre-charge to fast-charge threshold VLOW(2.5V). Which describe is right?
    7.5 Electrical Characteristics write 20% x ICHG
    8.4.5.5 BAT Output write 10% typ x ICHG

    A2. The Electrical Characteristics table is correct.
    Pre-charge current will be 20% of fast charge current. Pre-charge battery voltage is 2.5V, above this point fast charge current is used.
  • 0 in reply to Bill Johns
    TI__Guru* 75786 points
    This Post contains 7 questions and reply will be split into separate replies.

    Q3. LPCM for Solar charger suitable since should be avoid pre-charge and fast-charge timeout cause IC shut down, right?

    A3. A couple of conditions that reduce charge current will slow the pre-charge and fast-charge timers, see section 8.4.5.8.
    Also a couple of conditions will reset the timers including LPCM, see section 8.4.5.8.
  • 0 in reply to Bill Johns
    TI__Guru* 75786 points
    This Post contains 7 questions and reply will be split into separate replies.

    Q4. Termination current threshold value, which describe is right? below is different condition?
    7.5 Electrical Characteristics describe is 12%.
    8.4.5.7 Termination describe is 14%.

    A4. Both are correct
    In Electrical Characteristics table "Termination - Internally Set" the I-TERM is typically 10% (Min 8% and Max 12%). This would be the typical battery charger profile charging a battery from pre-charger, fast-charge(CC) and taper(CV) to termination.
    8.4.5.7 Termination describe is 14%.---Refers to a situation where a new battery has been inserted into a charger. A routine optimized for a charged battery is used and part of this is raising termination threshold to 14% for first minute.
  • 0 in reply to Bill Johns
    TI__Guru* 75786 points
    This Post contains 7 questions and reply will be split into separate replies.

    A5. Why we need "Batteries that have relaxed many hours may take several minutes to taper to the termination threshold and terminate charge."?
    Q5. Li-Ion Battery Relaxation is a change in the battery voltage during the time of no charging or discharging due to electrochemical action inside the cell. A number of article are available regarding this, link to one below.

    www.ti.com/lit/ml/slyp086/slyp086.pdf
  • 0 in reply to Bill Johns
    TI__Guru* 75786 points
    This Post contains 7 questions and reply will be split into separate replies.


    Q6. BAT < BAT(SC) mean bq24210 into LPCM mode, right? LED on/off show what behavior?
    Ref data sheet Table 1

    A6. Table 1 will refer to LPCM mode (or not) set by the voltage at TS pin (V-TS). The behavior of /CHG will change depending on LPCM mode and battery short detect will change. See section 8.4.5.10.
  • 0 in reply to Bill Johns
    TI__Guru* 75786 points

    Question 7 regarding figure 14 is still in work.