SDIO Conflict with I2S on modded F4 Discovery Board

[pito]

I had problems with some cards because it has current consumption more than 250 - 300mA in peak at insertion moment!!!

Maybe a short when inserting the sdcard into the socket?

Probably this is why I have seen inductors in some designs.

A ferrite bead might help.. I would be careful of adding larger values (ie 4.7uH) as with high ESR capacitors and a suboptimal pcb design it may make the situation even worse..

[alexblack]

Hi.

Maybe a short when inserting the sdcard into the socket?

No, it is excluded.
This is a very rare problem. But at least I remember two cases where customers sent us a card with the equipment and with the complaint. I do not remember the card manufacturer.