SanDisk microSD™, microSDHC™ and microSDXC™ cards
OEM Product Manual
2.5
January 2012 Version 2.5 © 2008 - 2012 SanDisk Corporation. SanDisk Confidential, subject to all applicable non-disclosure agreements
4
sleep mode to conserve power if no further commands are received in less than 5
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, cards are in sleep mode except when accessed by
the host, thus conserving power.
When the host is ready to access a card in sleep mode, any command issued to it will
cause it to exit sleep, and respond.
1.5.6
Hot Insertion
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.
1.6
microSD Card Products in SD Bus Mode
The following sections provide valuable information on cards in the SanDisk
microSD Card Product Family in SD Bus mode.
Cards in the SanDisk microSD Card Product Family are fully compliant with the SDA
Physical Layer Specification, Version 3.01. Card Specific Data (CSD) Register
structures are compliant with CSD Structure 1.0 and 2.0.
This section covers Negotiating Operating Conditions, Card Acquisition and
Identification, Card Status, Memory Array Partitioning, Read/Write Operations, Data
Transfer Rate, Data Protection in Flash Cards, Write Protection, Copy Bit, and CSD
Register.
Additional practical card detection methods can be found in application notes
pertaining to the SDA Physical Layer Specification, Version 3.01.
