SMS01GDFB5E NUMONYX, SMS01GDFB5E Datasheet - Page 28

• 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

SD memory card hardware interface
4.3
4.4
4.5
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Hot insertion/removal
To guarantee a reliable initialization during hot insertion, some measures must be taken on
by the host.
For example, a special hot-insertion capable card connector may be used to guarantee the
sequence of the card pin connection.
The card contacts are connected in three steps:
1.
2.
3.
Pins 3 and 4 should be connected first on insertion, and be disconnected last on extraction.
Another method is a switch which could ensure that the power is switched on only after all
card pads are connected.
Inserting a card in or removing it from the SD memory card bus with the power on will not
damage the card. Data transfer operations are protected by CRC codes, therefore any bit
changes induced by card insertion and removal can be detected by the SD memory card
bus master.
Power protection
Cards have to be inserted in or removed from the bus without being damaged. If one of the
supply pins (V
line. All the card outputs should also be able to withstand shortcuts to either supply. If the
hot insertion feature is implemented in the host, then the host has to be able to withstand an
instant shortcut between V
Electrical specifications
Table 17
capacitance C
capacitance C
connected to this line.
C
As the bus can be supplied with a variable supply voltage, all signal levels are related to the
supply voltage. See
signal
L
= C
Ground V
CLK, CMD, DAT0, DAT1, DAT2 and V
CD / DAT3 (pin 1).
The inserted card must be properly reset even when the clock frequency is f
Each card should be fitted with a protection from the power supply to prevent damage
to the card (and host).
Data transfer failures induced by removal/insertion are detected by the bus master.
They must be corrected by the application, which may repeat the issued command.
N is the number of cards connected to the line
C
to 30 cards
The values in
HOST
voltages.
HOST
defines the bus operating conditions for the SD memory card. The total
+ C
+ C
DD
L
HOST
SS
BUS
of the CLK line of the SD memory card bus is the sum of the bus master
BUS
or V
(pin 3) and supply voltage V
Table 17
, the bus capacitance C
must be lower than 30 pF for up to 10 cards and lower than 40 pF for up
Figure 15: Bus signal levels
+ N × C
SS
) is not connected properly, then the current is drawn through a data
DD
should not be exceeded.
CARD
and V
, where:
SS
without being damaged.
SS
BUS
(pin 6)
DD
and the capacitances C
and
(pin 4)
Table 18: Bus signal condition - I/O
CARD
of all the cards
SMSxxxDF
PP