Mini Secure Digital (SD) memory card is a small portable storage device. It is used in cell phones, MP3 players, digital cameras and in other various electronic devices to store data such as files, photos, videos, songs etc. After being success of the SD card, miniSD card was introduced into the mobile phone market to meet their demands successfully. The miniSD card provides benefits similar to SD card. MiniSD cards are 21.5 x 20 x 1.4 mm and its storage capacity ranges from 16MB to 4GB.

Features of MiniSD card

  • Capacity: 128 / 256 / 512
  • Form Factor: 21.5mm x 20mm x 1.4mm
  • Voltage range : 2.7 - 3.6V
  • Operating Temperature: -25 ~ 85°C
  • Maximum Data Transfer Rate: 7MB/sec
  • Designed for read-only and read/write cards
  • Fully compatible with SD card spec. v1.1
  • Mechanical Write Protection Switch
  • Forward compatibility to Multi Media Card
  • Low power utilization : automatic power down and automatic wake up
  • smart power supervision
  • No external programming voltage required

MiniSD Memory Card Interface

This card provides two different communication protocols i.e. miniSD and SPI. Applications can select either one of modes. Mode choosing is apparent to the hosts. The card automatically finds the mode of the reset command and it will look forward to all auxiliary communication to be in the same communication mode. Thus, applications that use only one communication mode do not have to be conscious of the other.

Transfer Modes in MiniSD Card

MiniSD card might support different combinations of the following transfer modes and bus types. All types of SD card uses SPI bus mode and one-bit SD bus mode. When the host device and the card convey a bus interface mode, the numbered pins usage will remain same for all card sizes.

  • SPI bus mode: Embedded microcontrollers primarily use serial Peripheral Interface Bus and this type of bus supports only a 3.3 volts interface.
  • One-bit SD bus mode: It separates command, data channels along with patented transfer format.
  • Four-bit SD bus mode: It uses extra pins and have some reassigned pins. UHS-I and UHS-II requires this bus type.

The physical interface of the card consists of nine pins, apart from that the miniSD card complements two unconnected pins in the center and the microSD card omits one of the two VSS(Ground) pins.

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