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BQ25611D: in standalone, without host MCU

Guenter Fettig
Intellectual 1540 points
Part Number: BQ25611D
Other Parts Discussed in Thread: BQ25601D

How to assemble BQ25611D if supplied out of external Buck converter, without USB connection & without host MCU ?

How to adjust input current limit without USB connection & without host MCU ?

  • 0
    TI__Guru 57551 points

    Hi,

    Referring to 9.3.6.1 Autonomous Charging Cycle, When battery charging is enabled (CHG_CONFIG bit = 1 and CE pin is LOW), the device autonomously completes a charging cycle without host involvement. The device default charging parameters are listed in Table 3. Please check the default settings listed on Register Maps on the d/s and see if the default settings fit your application and batteries being used.

    If D+/D- pins are short, the input current limit is set at 2.4-A. If D+/D- pins are ok, the input current limit is set at 0.5 A.

    Please visit https://e2e.ti.com/support/power-management/f/196/t/890624 for I2C controlled BQ2560X: Schematic Review and PCB Layout Design Tips. BQ25611D is similar to BQ25601D.

    It is highly recommended to get familiar with the device operations by testing the device EVM.

    Thanks,

    Ning.

  • 0 in reply to Ning T
    Prodigy 10 points

    Hi Ning,

    Thank you for the info!

    "If D+/D- pins are short, the input current limit is set at 2.4-A"

    >> what does it mean short? Connceted to GND? According table1 in data sheet Non-Standard Adapter Detetction is input current limit set to 2.4A if:

    D+ und D- within Vd+/Vd-_2p8

    And 2.55 V< Vd+/Vd-_2p8 < 2.85V

    My question, if I put ~ 2.8V external voltage level on both pins D- and D-, than the input current limit is set to 2.4A, is that right?

    Thank in advance!

    Best regards

    Norbert

  • 0 in reply to Norbert Gungl
    TI__Expert 5590 points

    Hi Norbert:

    "If D+/D- pins are short" means D+ and D- pins are tied together and floating. In that case, the port is detected as DCP. Vd+/Vd-_2p8 spec is for Apple adaptor detection, if Apple 2.4A adaptor is detected, the input limit is set at 2.4A. If you put 2.7V at D+/D- pins, the charger may detect it as Apple adaptor and set 2.4A input current limit.

    Regards,

    Hong