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DP83TC814R-Q1: what's the meaning of Ground Escape?

Hazel Sun
Expert 6535 points
Part Number: DP83TC814R-Q1
Other Parts Discussed in Thread: DP83TC811

Hi  team,

I notice there are PINS named Ground Escape, what's the meaning of these PINS? can you help to explain the use scenarios and principles? thanks 

  • 0
    Guru 259890 points

    Table 6-1 says:

    Ground Escape: Optional ground escape pins. These pins can be connected to ground to optimize PCB layout. These pins are not substitute for power ground connection to DAP. DAP must always be connected to power ground.

    This pin can be left unconnected if not used.

  • 0 in reply to Clemens Ladisch
    TI__Expert 6535 points

    Hi  Clemens,

    thanks for the reply, i see this on DS, but i still want to know, what's the meaning of "optimize PCB layout?'', do these pins for the power GND or digital GND optimize the EMI issue? 

  • 0 in reply to Hazel Sun
    TI__Mastermind 30525 points

    Hi Hazel,

    This pin is used for flexibility to allow DAP GND to be connected if vias are not used to connect GND. If a scenario where customer is limited to only having GND plane on outer layer, this allows for connection from plane to DAP.

    Sincerely,

    Gerome

  • 0 in reply to Gerome Cacho
    TI__Expert 6535 points

    Hi Gerome:

    1.the via connect to GND, you mean the plane needs to connect to GND by vias right?

    2.If the plane has vias connected to GND, can we let Ground Escape float? Because we need compatible with DP83TC811(it is for TCK and TDO);

  • 0 in reply to Hazel Sun
    TI__Mastermind 30525 points

    Hi Hazel,

    Yes, there have been applications where customers have more freedom/layers to route GND. GND_Escape is used in case there is less freedom to route to be able to give some type of access to DAP GND if top layer GND is only option.

    If DAP GND is taken care of with vias you may not need to utilize GND escape.

    Sincerely,

    Gerome