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OSCx_GND termination (and using Clock instead of Crystal)

Forums › Reference, Evaluation, and Development Boards › OSCx_GND termination (and using Clock instead of Crystal)

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    • June 21, 2018 at 2:00 pm #5719
      Dion Krieldion
      Participant

        QUESTION 1

        The reference design notes for clock circuitry show Figures 1, 2 (copied from AM3358) with OSCx_GND pins connected to DGND. However, Figure 3 and all eval board schematics show no external connection to OSCx_GND pins.

        Are OSCx_GND pins connected to DGND inside the OSM3358 SiP, or should there be an external connection to DGND?

        QUESTION 2

        Instead of a crystal, if I use a clock oscillator (e.g. SIT8008), how do I connect this clock oscillator chip’s GND pin?

        (a) only to OSCx_GND pin?

        (b) only to DGND?

        (c) to both?

        REFERENCES

        https://octavosystems.com/app_notes/osd335x-design-tutorial/bare-minimum-boot/clock-circuitry/ –> Figures 1, 2, 3

      • June 21, 2018 at 3:15 pm #5721
        Neeraj Kumar Reddy DantuNeeraj Dantu
        Moderator

          Dion,

          1. OSCx_GND pins are connected to ground inside the SiP. So, there is no need to have an external ground connection for the OSCx_GND

          2. You can connect the ground pin of the oscillator to DGND or to OSCx_GND as the pin is connected to ground internally

          Neeraj

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