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HD3SS3220: Application issues of chips

Tonyx.wu
Expert 2905 points
Part Number: HD3SS3220

1. May I ask if this USB chip is in GPIO mode and then subjected to pressure testing, will there be a situation where the yellow label is not recognized?
2. Is the I2C mode intended for OTG functionality?

  • 0
    TI__Mastermind 19700 points

    Hi Tony,

    Tonyx.wu said:
    May I ask if this USB chip is in GPIO mode and then subjected to pressure testing, will there be a situation where the yellow label is not recognized?

    Can you describe what pressure testing you're doing and what yellow label means in this context? I haven't heard this term before.

    Tonyx.wu said:
    Is the I2C mode intended for OTG functionality?

    You can have OTG functionality with or without I2C mode. In GPIO mode, leave the PORT pin NC to configure the 3220 as a DRP.

    Best,

    Shane

  • 0 in reply to Shane Hauser
    Expert 2905 points

    The function is related to the port mode selection of the device pin. Try SRC and Try SNK is an optional Type-C DRP (Dual Role Port) feature of HD3SS3220, only valid in I2C mode
    Try SRC and Try SNK is switching between source and sink
    Can I understand that i2c mode can automatically switch between DFP and UFP?

  • 0 in reply to Tonyx.wu
    TI__Mastermind 19700 points

    Hi Tony,

    Tonyx.wu said:
    Try SRC and Try SNK is an optional Type-C DRP (Dual Role Port) feature of HD3SS3220, only valid in I2C mode

    Try.SRC and Try.SNK are options for DRP mode that are only available in I2C mode. The basic Dual Role Port mode is available in both I2C and GPIO modes.

    Tonyx.wu said:
    Try SRC and Try SNK is switching between source and sink

    This is not entirely correct. DRP mode is what switches the port between source and sink.

    Try.SRC and Try.SNK will only give your DRP a preference towards being a source or a sink when connected to another DRP.

    Tonyx.wu said:
    Can I understand that i2c mode can automatically switch between DFP and UFP?

    You are correct. This is Dual-Role Port functionality, which can be done in both I2C or GPIO modes.

    If you want your DRP to have a preference towards DFP (Source) or UFP (Sink) then you need to use Try.SRC or Try.SNK in I2C mode.

    Let me know if you have any questions.

    Best,

    Shane