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3.1.11 MicroSD Interface card
GR500 supports the MicroSD card interface as external memory card.
MicroSD card has 4-data lines. All control and data line is connected to DB3200.
Because of the voltage level difference between DB3200 and MicroSD card, a level shifter should
be added.
MICROSD_CMD
MICROSD_CLK
MICROSD_DAT
VDDG_2V85
Card detection
- When there are no card in MicroSD card socket, MICROSD_DAT3 pin is high because
of an internal pull-up.
- If Card is inserted in socket, the pull up can be disconnected by using SET_CLR_DETECT
command.
- VDDG_2V78 always supply power.
- If card is removed,
MICROSD_DAT3
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Figure 3-1-11. MicroSD card and Schematic of MicroSD card Interface
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
MicroSD card Interface
Command/Response
Clock
Data line
Supply voltage from AB3100 internal LDO
Table 3-1-7. MicroSD card Interface
pin changes high.
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- 35 -
3. TECHNICAL BRIEF
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LGE Internal Use Only
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Troubleshooting
