Hi,
I am designing a custom board based on the STM32H753, and as part of the design process I am reviewing the MB1246 and MB1331 evaluation board schematics for reference.
While studying the display interface, I noticed the following discrepancy:
On the MB1331 board, the display interface pins include 470 Ω @ 100 MHz ferrite beads.
On the MB1246 board, these ferrite beads are not present.
Since I am planning to use the STM32H753 with the same 7" display used on the MB1331 board, I would like clarification on:
What was the rationale behind adding ferrite beads on the MB1331 display interface while they were not used on MB1246?
Are the ferrite beads primarily intended for EMI/EMC performance, or are they required for signal integrity or noise filtering specific to the 7" display?
For a custom board design, would you recommend including the same ferrite beads as on MB1331, or are they optional depending on system-level EMC requirements?
Understanding this difference will help me ensure my design follows ST’s best practices and avoids potential display interface issues.
Thank you for your assistance.
Mohammed
