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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. TECHNICAL DESCRIPTION
3.1.12 MicroSD Interface card
GT500 supports the MicroSD card interface as external memory card.
MicroSD card has 4-data line, so GT500 uses 4-data lines.
All control and data lines are connected to DB3200.
Cause of the difference between DB3200 and MicroSD card, a level shifter should be added.
Table 3-1-7. MicroSD card Interface
y Card detection
- When there are no card in MicroSD card socket, APP_GP_MMC_DETn pin is high cause of an external
pull-up.
- If card is inserted in socket, APP_GP_MMC_DETn pin is changed to Low cause of the mechanical switch
in the socket.
- If card is removed, APP_GP_MMC_DETn pin changes high.
Figure 3-1-12. Micro SD card and Schematic of Micro SD card Interface
MicroSD card Interface
APP_GP_MMC_DETn
Card detection, connected to GPIO of DB3200
MICROSD_CMD_2V7
Command/Response
MICROSD_CLK_2V7
Clock
MICROSD_DAT[3:0]_2V7
Data line
VDDG_2V85
Supply voltage from AB3100 internal LDO
VDDE_1V8
DAT1A
A2 D1
DAT1B
B4
DAT2A DAT2B
C4
A4
DAT3A
D4
DAT3B
GND1
B3
GND2
C3
A5
VCCA
D5
VCCB
SN74AVCA406EZXYRU403
A3
CLKA
D3
CLKB
CLK_F
A1
CMDA
B1
C2
CMDB
CMD_DIR
B5
B2
DAT0A DAT0B
D2
DAT0_DIR
C5
DAT123_DIR
C1
C409
0.1u
2
4
6
8
1
3
5
7
C410
RA400
100K
0.1u
VDDG_2V85
100K
R637
MICROSD_DAT3_2V85
MICROSD_CMD_2V85
MICROSD_DAT0_2V85
MICROSD_DAT1_2V85
MICROSD_DAT2_2V85
MICROSD_CLK_2V85
APP_MMC_FB_CLK
MICROSD_CLK
MICROSD_CMD_DIR
MICROSD_CMD
MICROSD_DAT_DIR
MICROSD_DAT0
MICROSD_DAT1
MICROSD_DAT2
MICROSD_DAT3
1608
Hirose ( Micro-SD Socket, Normal ,T= 1.68)
MICROSD SOCKET
ENSY0020901
220K
R419
EVLC18S02015
VA403
VA4 02
EVLC18S02015
VA405
EVLC18S02015
SWA SWB
4
6
DM3AT-SF-PEJ
2
5
3
7
8
1
GND
S400
R416 2.2
EVLC18S02015
VA4 01
EVLC18S02003
VA4 06
EVLC18S02015
VA404
VDDG_2V85
VDDE_1V8
VA4 00
EVLC18S02015
10u
C408
MICROSD_DAT0_2V85
MICROSD_CLK_2V85
MICROSD_DAT1_2V85
APP_GP_MMC_DETn
MICROSD_CMD_2V85
MICROSD_DAT2_2V85
MICROSD_DAT3_2V85
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