Removable Memory Card (MMC) on mobile phones circuit

Posted on Feb 5, 2014

In this tutorials we are going to tackle out how dos the memory card circuit works on mobile phones. As in my previous post I talked about memory card pin-outs and types of memory cards used on cellular phones. Okay, the block diagram below shows how the removable memory card or MMC card connection to other corresponding components. Since the mem

Removable Memory Card (MMC) on mobile phones circuit
Click here to download the full size of the above Circuit.

ory card has two signal function operations, the SD mode and SPI mode, the SD mode indicates that all pins of the memory card ether SD card, miniSD card and microSD card has a connections while in SPI mode some of the pins are not connected. See the block diagram below. In mobile phones ESD and EMI filtering were so very important, the connection between the memory card across to the application processor is being filtered or protected by any means of ESD and EMI interruption. The best easy way to identify which one has SD or SPI designed, is by figuring it out on the schematic diagram, and it is so important to know about this for easy troubleshooting and repair memory card related problem issues.

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