SDSDJ-512-814-J SanDisk, SDSDJ-512-814-J Datasheet - Page 26

• Manufacturer Part Number: SDSDJ-512-814-J
• Description: MEMORY CARD SD 512MB
• Manufacturer: SanDisk

Specifications of SDSDJ-512-814-J

• Memory Size: 512MB
• Memory Type: Memory Card - Standard SD™
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

07/07, Rev. 2.1
Interface Description
Electrical Interface
Power Up
Bus Operating Conditions
The power scheme of SanDisk SD products is handled locally in each card and in the bus
master. Refer to Section 6.4 of the SDA Physical Layer Specification, Version 2.00.
Power must be applied to the V
CMD, CLK, and DAT0-3 must be at zero (0) volts when power is applied to the V
more information, refer to Section 6.4.1 of the SDA Physical Layer Specification, Version
2.00.
Figure 3-1 Recommended Power Control Scheme
The recommended power control scheme for SanDisk SD, miniSD, and microSD cards is
illustrated in Figure 3-1. Most card connectors have a card detect switch that signals the SD
host when the card is inserted. After the host is aware of the card insertion, it turns on the FET
switch to apply power to card's V
Once the card is inserted and all card pins are making contact, there is a delay before the FET
switch is turned on.
IMPORTANT
It is the host's responsibility to make sure power gets to V
go above zero volts.
SPI Mode bus operating conditions are identical to SD Card Bus Mode operating conditions.
For details, see Section 6.6 of the SDA Physical Layer Specification, Version 2.00.
CMD,DAT0-DAT3
Host VDD
Host VSS
pins, it is crucial to ensure that CLK, CMD, and DAT0-3 are at zero (0)
volts during the delay, and before FET switch is turned on. If any I/O
pin, (CMD, CLK, or DAT0-3) goes above zero volts during the delay
and before power reaches the card V
clamping diodes and can cause the card to go into an unknown state.
Because there are clamping diodes on the CMD, CLK, and DAT0-3
SD Host
3-4
DD
DD
CH
pin before any I/O pin is set to logic HIGH. In other words,
pin.
ON/OFF
switch
FET
SanDisk SD Card Product Family Product Manual
Rpu
DD
pin, it will forward bias the
DD
Card VDD
Dclamp
Crad VDD
before CMD, CLK, or DAT0-3
© 2007 SanDisk Corporation
Cc
SD Card
(5uF max)
DD
pin. For