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TPS2511: D+/- port voltage

ACGUY
Guru 11170 points
Part Number: TPS2511
Other Parts Discussed in Thread: TPS2546

Hello E2E,

During operation, when not connected USB connector that how much the voltage for D+/- port?

Regards,

ACGUY

  • 0
    TI__Mastermind 28540 points
    Hello ACGUY,

    If there is no device connected to the USB port, then there will be no voltage presented on the DP/DM lines.
  • 0 in reply to Adam Mc Gaffin
    Guru 11170 points

    Hello Adam,

    >> then there will be no voltage presented on the DP/DM lines.
    Is it floating? or 0-Voltage?

    Currentry, when there is no device connected to the USB port, D+/- ports have internal Vref voltage.
    D+ : 2.7V
    D- : 2.0V
    Is it default state?

    I think that their voltages are not affect for normal operation for TPS2511.

    Regars,
    ACGUY

  • 0 in reply to ACGUY
    TI__Mastermind 28540 points
    Hello ACGUY,

    Appologies as my initial comment is wrong. I mentally thought that you were using the TPS2546 (another USB charger family of devices I support) instead of the dedicated charger controller of the TPS2511. What you are seeing is correct for the TPS2511 as well as for the TPS2546 if it is in DCP_Auto mode.

    The TPS2511 integrates this DCP_Auto functionality which allows for it to charge BC1.2 compliant devices as well as non-compliant devices. The sequence is outlined within 7. 4.2 of the TPS2511 datasheet, but the TPS2511 starts by advertising the non-compliant charging scheme of Divider 2, which puts 2.7V on the DP pin and 2V on the DM pin.

    Hope this answers your question, and I apologize for any confusion.