SDMJ-32 SanDisk, SDMJ-32 Datasheet - Page 6

• Manufacturer Part Number: SDMJ-32
• Manufacturer: SanDisk
• Type: MultiMedia Cardr

Specifications of SDMJ-32

• Density: 32MByte
• Operating Supply Voltage (typ): 3.3V
• Operating Temperature (min): -25C
• Operating Temperature (max): 85C
• Package Type: MMC
• Mounting: Socket
• Pin Count: 7
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 3.6V
• Programmable: Yes
• Lead Free Status / RoHS Status: Compliant

Revision 1.3
© 2005 SanDisk Corporation
1.12.1
1.12.2
1.9
1.10
1.11
1.12
Endurance
Automatic Sleep Mode
Hot Insertion
MultiMediaCard Mode
MultiMediaCard Standard Compliance
Negotiating Operating Conditions
The SanDisk MultiMediaCard and RS-MultiMediaCard have a typical endurance
specification for each sector of 100,000 writes (reading a logical sector is unlimited). This
far exceeds what is required in nearly all card applications. For example, very heavy use of
the MultiMediaCard/RS-MultiMediaCard in cellular phones, personal communicators,
pagers and voice recorders will use only a fraction of the total endurance over the device’s
typical lifetime. That means it would take over 34 years to wear out an area of the card on
which a file of any size (from 512 bytes to maximum capacity) was rewritten 3 times per
hour, 8 hours a day, 365 days per year. However, for the vast majority of users employing
typical applications, the endurance limit is not of any practical concern.
A unique feature of the SanDisk MultiMediaCard/RS-MultiMediaCard is automatic
entrance and exit from sleep mode. Upon completion of an operation, the card enters the
sleep mode to conserve power if no further commands are received in less than five
milliseconds (ms). The host does not have to take any action for this to occur. However, in
order to achieve the lowest sleep current, the host needs to shut down its clock to the card.
In most systems, the MultiMediaCard/RS-MultiMediaCard is in sleep mode except when
the host is accessing it, thus conserving power.
When the host is ready to access the card in sleep mode, any command issued to it will
cause it to exit sleep, and respond.
Support for hot insertion will be required on the host but will be supported through the
connector. Connector manufacturers will provide connectors that have power pins long
enough to be powered before contact is made with the other pins. This approach is similar
to that used in PCMCIA and MMCA devices to allow for hot insertion and applies to
MultiMediaCard and SPI modes.
The following sections provide valuable information on the MultiMediaCard and RS-
MultiMediaCard in MultiMediaCard mode.
The MultiMediaCard and RS-MultiMediaCard are fully compliant with the
MultiMediaCard Standard Specification, v3.3. The structure of the Card Specific Data
(CSD) Register is compliant with CSD Structure v1.2.
The MultiMediaCard and RS-MultiMediaCard support the operation condition verification
sequence defined in the MultiMediaCard Standard Specification, v3.3. If the host defines
an operating voltage range not supported by the card, the card will go into an inactive state
1-4
MultiMediaCard/RS-MultiMediaCard Product Manual
Chapter 1 – Introduction
03/22/05