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TUSB319-Q1: Negotiation of charging current limit

Kuramochi Tadahiko
Guru 28715 points
Part Number: TUSB319-Q1

Hi,

I would like to know how charging current limit is decided on Type-C application.

I'm understanding that charging current limit is negotiated on CC1/2 line.

However charging current negotiation is executed on also D+/D-.

Which line(CC line or D+/D- line) is preceded for negotiation of charging current?

Best Regards,

Kuramochi

  • 0
    TI__Genius 16150 points

    Hi Kuramuchi,

    For non PD devices USB Type-C receptacle shall not advertise current exceeding 3.0A (TUSB319-Q1 advertise a max of 3A). In the  case of PD devices the maximum current capability is up to 5A.

    The negotiation is performed through CC lines, according to the Type-C PD spec. Once an attachment is detected, the PD contract is done where the capabilities of cable and source-sink to stablish the maximum current and voltages supported.

    Best Regards,

    Luis Omar Moran

    High Speed Interface

    SWAT Team