CARD PINOUTS - FOR MEMORY CARD PROBLEMS AND FAILURE REPAIR

CARD PINOUTS - FOR MEMORY CARD PROBLEMS AND FAILURE REPAIR

learning how does the removable memory card works on mobile phone devices. We can easily configure on how to repair if something went wrong when the memory card related problems such as memory card can't be read, memory card not detected and many other related memory card errors on mobile phones occurred.

But first, we must also understand about removable memory cards and how it is being constructed.
In mobile phones there are three types of removable memory card being used the first was the SDcard which is so big in size used on some old model cell phones and then comes the MiniSD and the latest is the microSD card which the smaller one and commonly used in most latest designs.

Secure Digital is what SD means, it is a flash based removable memory card. The card format may also be used other device functions in addition to data storage.

The SD card size dimensions are: 24mm wide x 32mm long. The standard width is 2.1mm, while the Thin SD Memory Card has a width 1.4mm.

**SD Card Pinout**
Pin	Pin Name	SD Signal Function SD Mode	SPI Signal Function SPI Mode
1	DAT3/CS	Data Line 3	Chip Select/Slave Select [SS]
2	CMD/DI	Command Line	Master Out/Slave In [MOSI]
3	VSS1	Ground	Ground
4	Vdd	Voltage Supply [2.7v or 3.6v]	Voltage Supply [2.7v or 3.6v]
5	Clock	Clock	Clock [SCK]
6	Vss2	Ground	Ground
7	DAT0/D0	Data Line 0	Master In Slave Out [MISO]
8	DAT1/IRQ	Data Line 1	Unused or IRQ
9	DAT2/NC	Data Line 2	Unused

MiniSD Card is a type of Removable NAND flash memory card format.
miniSD cards have memory capacities ranging from 256MB to 4GB. However, some of the capacity may be used for formatting and other functions, and not available for data storage. A miniSD card will fit in an SD card slot with a miniSD Adapter, miniSD Adaptes makes miniSD memory cards compatible with all SD-based devices.
There are 3 speed grades: Class 2, 2MB/s, Class 4, 4MB/s and class 6 card, 6MB/s.

The MiniSD Card measures 20mm x 21.5mm and 1.4mm thick.

**miniSD Pinout Configuration**
Pin #	Pin Name	SD Signal Function SD Mode	SPI Signal Function SPI Mode
1	CD/DAT3	Chip Detect/Data Line 3	Chip Select
2	CMD	Command Line	Data In [DI]
3	VSS1	Ground	Ground
4	Vdd	Voltage Supply [2.7v or 3.6v]	Voltage Supply [2.7v or 3.6v]
5	Clock	Clock	Clock [SCK]
6	Vss2	Ground	Ground
7	DAT0	Data Line 0	Data Out [DO]
8	DAT1	Data Line 1	Unused
9	DAT2	Data Line 2	Unused
10	NC	For future use	For future use
11	NC	For future use	For future use

microSD Card is also a type of Removable NAND-type small flash memory card format, and has a dimensions of 11mm x 15mm and 1mm thick. MicroSD is short hand for Micro-Secure Digital [Transflash].

**microSD Pinout, SD Mode**
Pin #	Pin Name	Signal Function
1	DAT2	Data Bit 2
2	CD/DAT3	Card Detect / Data Bit 3
3	CMD	Command Line
4	Vdd	Supply Voltage 2.7v / 3.6v
5	CLK	Clock
6	Vss	Ground
7	DAT0	Data Bit 0
8	DAT1	Data Bit 1

**microSD Pinout, SPI Mode**
Pin #	Pin Name	Signal Function
1	NC	No Connect
2	/CS	Chip Select
3	DI	Master Out/Slave In (MOSI)
4	Vdd	Supply Voltage 2.7v / 3.6v
5	CLK	Clock
6	Vss	Ground
7	DO	Master In/Slave Out (MISO)
8	RSV	Reserved