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AM335X MPU power supply

Pranoti Sadaphule
Prodigy 120 points

HI ,

Do we need ferrite beads at each supply line of MPU?

Regards,

Pranoti

  • 0
    TI__Guru**** 393215 points
    Hi,

    Ferrite beads are not specifically required. They are however recommended on the PLL and ADC power supplies. The rest depends on the particular use case.
  • 0 in reply to Biser Gatchev-XID
    TI__Guru 64895 points
    Ferrite beads are normally used to isolate noise from one circuit to another circuit when they share a power rail. Why would you want to use ferrites on the MPU supply with having a dedicated supply?

    I would not recommend ferrite beads on the VDD_MPU power pins. The ferrite beads may limit transient currents being sourced from bulk decoupling capacitors and may require you to place additional bulk capacitance on the processor side of the ferrite beads. This is normally difficult to do since the area near the processor is very congested.

    Regards,
    Paul
  • 0 in reply to Biser Gatchev-XID
    Expert 1030 points
    Hi Biser,

    Please let us know where exactly ferrite bead is required. I assume following three supply nets need ferrite beads as per Beagle bone schematic. Please let em know if more supply nest needs to be fed through ferrite beads.
    1.8V supply - Ferrite beads --VDDA_ADC
    GND - Ferrite beads --VSSA_ADC
    1.8V supply - Ferrite beads --VDDS_PLL_XXX and VDD_OSC
  • 0 in reply to Manoj Agarwal
    TI__Guru**** 393215 points
    Yes, it would be good to have ferrite beads on these 3 power rails.