Initialization of a microSD card using an SPI interface

Question

I\'m using a microSD card in an embedded design. The card is connected to a microcontroller using the SPI interface. It worked fine for all cards I\'ve used before, but now my n

Answer 1

It's normal, it's likely the internal charge-pump used to make erase voltage that takes longer than usual to be ready... you have to insist on the CMD55+ACMD41 combo until initialization finishes.

The CMD58 could also help you to check if you're supplying correct voltage levels (sometimes sockets have contact problems).