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BQ25601D: Charge current from a 9V 3A unknown adapter with D+/D- floating

John Leung
Prodigy 70 points
Part Number: BQ25601D

Tool/software:

Hi

If I just apply a 9V 3A (via a benchtop PSU) to VBUS input of BQ25601D with D+/D- floating, what is the charge current is going to be?

It is under the conditions that register REG00 set to its default values so, IINDPM[4:0] is 10111 (the input current limit is 2400mA.)

I am wondering if the power input will be treated as an unknown adapter following VBUS_STAT[2:0] of 500mA or, the input current limit of 2.4A will dominate.

The result will be a lot different 9*2.4W vs 9*0.5W.

Please advise.

Best regards

John Leung

  • +1
    TI__Mastermind 24715 points

    Hi John, 

    Thank you for reaching our via E2E. 

    If D+/D- pins are floating the input supply will be detected as an unknown adapter and IC sets IINDPM register to 500mA. If you instead short D+/D- pins together the input type detection will result in USB DCP detection and IINDPM is set to 2.4A. 

    Additionally, please keep in mind the host MCU can always overwrite the IINDPM register setting via I2C write after the D+/D- detection has completed. 

    Best Regards,

    Garrett