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BQ24161: Lowest charge current

TJ
Intellectual 860 points
Part Number: BQ24161

Using BQ24161 and wanted to know what the lowest charge current possible for the device? the table in section 9.6.6 shows 75mA on the 5th line down if you write 0xB3. However, the statement below the table "Charge current sense offset is 550mA and default charge current is 1000mA" makes me unsure of what the lowest charge current is. 

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  • 0
    TI__Intellectual 860 points

    including a screen shot from the DS to reference what I'm talking about. 

  • +1 in reply to TJ
    TI__Guru*** 143870 points

    Hi TJ,

    The lowest charge current setting in the register above is 550mA offset plus the step up bits in the table.  There is a LOW CHRG bit in REG0x07b0 that reduces the charge current by 1/2 so the lowest regulated charge current is 550mA /2 = 225mA.  If you aren't using the TS pin, you can also reduce the charge current by 1/2 by fooling the charger's TS pin into thinking the battery is in JEITA COOL.  Last, you can limit the input current for IN in REG00x3b1 or USB in REG0x2b6:4 which limits the total output power  [ISYS+IBAT)*VSYS}, prioritizing ISYS over IBAT.  If your system has a predictable ISYS, you can set input current limit to control the amount of remaining current that goes to charge the battery.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    TI__Intellectual 860 points

    Thanks for the help Jeff.