MultiMedia Card uses a 7-Pin connector [1 rows of 7 pins]. The 7-pin
connector is on 2.5-mil centers. The seven pin interface consists of
three pins dedicated to the SPI serial bus [SCK, SI, and SO], a Chip
Select signal [CS], a Chip Reset [RESET], a Write Protect line [WP], and
an output Ready/Busy [RDY/Busy] signal. All of the control signals execpt
the RDY signal are active low. The SPI interface uses the Serial Clock
[SCK] line, Serial Input [SI], and the Serial Output [SO] line. How ever
the physical DataFlash card does not have all the signals listed above,
refer to the pinout table shown below. A few of the signals listed above
may only be found on the DataFlash Integrated Circuits [ICs]. A smaller
form factor of MMC is called Reduced Size MultiMedia Card [RS-MMC]. The
RS-MMC card is 24mm x 16mm x 1.5mm. The RSMMC remains pin compatible with
the MMC module, but shorter
The newer versions of the standard; MMCplus, MMCmobile and MMCmicro,
offer the higher transfer speeds up to 52MB/sec, or 416 Mbits/sec, and
support for dual-voltage operation (1.8 and 3/3.3V), and multiple bus
widths (x1, x4 and x8 bit). MMCplus, MMCmobile and MMCmicro utlize 13
pins while remaining backwards compatible with the previous version of
7-pin MMC cards
The MultiMedia card dimensions are: 1.4mm thick x 24mm wide x 32mm long. The 7-pin cards are form factor compatible with the DataFlash Card standard, and pinout compatible to the SPI version of the MMC card. A short description of the SPI interface is listed on the Integrated Circuit Buses
| Pin # | Pin Name | Signal Function |
| 1 | CS* | Chip Select |
| 2 | SI | Serial Input [SPI] |
| 3 | GND | Ground |
| 4 | Vcc | Voltage Supply [2.7v or 3.6v] |
| 5 | SCK | Serial Clock [SPI] |
| 6 | NC | No Connect |
| 7 | SO | Serial Output [SPI] |
Refer to this page for a list of different Flash Memory Stick Formats.
Engineering Design Key words: MultiMedia Card, DataFlash card, MMC Card, Form Factor, SPI, pinout, Pin out Personal Computer Memory Card International Association, PC Card, Interconnect, Electrical layer, Interface Standard Data Bus, Standard, Specification, Spec, Interface, IC, Physical Interface, Description, Manufacturer, Personal Computer, PC, Pin-out, Connector Pins
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