SMS01GDFB5E NUMONYX, SMS01GDFB5E Datasheet - Page 27

• Manufacturer Part Number: SMS01GDFB5E
• Description: MICROSD CARD SMS 1GB FLASH MEM
• Manufacturer: NUMONYX

Specifications of SMS01GDFB5E

• Memory Size: 1GB
• Memory Type: SD (Secure Digital)
• Operating Supply Voltage (typ): 3.3V
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 3.6V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

SMSxxxDF
4.2
Figure 14. Power-up diagram
1. Initialization delay = 1 ms (max) + 74 clock cycles + supply ramp-up time.
2. Timeout value for initialization process is 1 s.
supply voltage
Bus master
V
V
DD
Supply voltage
DD
Power-up
The power-up time is defined as the voltage rising time from 0 V to V
on application parameters such as the maximum number of SD cards, the bus length and
the characteristic of the power supply unit.
The supply ramp-up time indicates the time that the power needs to reach the operating
level (the bus master supply voltage) and the time to wait until the SD card can accept the
first command.
The host supplies power to the card so that the voltage reaches V
starts to supply at least 74 SD clocks to the SD card with keeping CMD line to High. In case
of SPI mode, CS is held to High during 74 clock cycles.
After power-up (including hot insertion) the SD card enters the idle state. In case of SD host,
CMD0 is not necessary. In case of SPI host, CMD0 is the first command to send the card to
SPI mode.
CMD8 is newly added in the physical layer specification version 2.00 to support multiple
voltage ranges and to check whether the card supports supplied voltage. The version 2.00
host issues CMD8 and verifies voltage before card initialization. The host that does not
support CMD8 supplies high voltage range.
ACMD41 is a synchronization command used to negotiate the operation voltage range and
to poll the cards until they are out of their power-up sequence. In case the host system
connects multiple cards, the host checks that all cards satisfy the supplied voltage.
Otherwise, the host should select one of the cards and initialize.
max
min
Power-up
time
Supply ramp-up
Initialization
Initialization
sequence
delay
time
(1)
CMD0
CMD8
Valid voltage range for all commands
ACMD
41
N
responds with the busy bit set.
CC
initialization process
ACMD41, until no card
Optional repetitions of
ACMD
Time out value for
SD memory card hardware interface
41
N
CC
ACMD
41
DD
(2)
(min) within 250 ms and
N
DD
CC
(min) and depends
CMD2
time
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