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BQ25895: USB Signal Conflict

Lifeng Jiang
Prodigy 40 points
Part Number: BQ25895

I'm using the BQ25895 to power an ARM SOC. The USB signals are routed to both the BQ25895 and the USB port of the ARM SOC.

When I connect the BQ25895 to a charger, how do I prevent the ARM SOC from interfering with the "Input Source Type Detection" process? I would like the BQ25895 to draw the maximum current available from the charger.

Thank you. 

  • 0
    TI__Guru**** 166626 points

    Hi Lifeng,

    The bq25895 only uses the D+/D- for the first 3s after it sees input power.  After that the lines go high impedance.  If you do not want to do detection and set the charger's input current limit register to the maximum, then you can simply short the charger's D+ pin =D- pin.  You can also clamp the input current below the maximum using the ILIM pin resistor, which you can later disable after the host is up and communicating.