Only For Training And Service Purposes - LG GT500 Service Manual

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.
APP_GP_MMC_DETn
MICROSD_CMD_2V7
MICROSD_CLK_2V7
MICROSD_DAT[3:0]_2V7
VDDG_2V85
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.
MICROSD_DAT0
MICROSD_DAT_DIR
MICROSD_DAT1
MICROSD_DAT2
MICROSD_DAT3
MICROSD_CMD_DIR
MICROSD_CMD
APP_MMC_FB_CLK
Figure 3-1-12. Micro SD card and Schematic of Micro SD card Interface
Copyright © 2009 LG Electronics. Inc. All right reserved.

Only for training and service purposes

MicroSD card Interface
Card detection, connected to GPIO of DB3200
Command/Response
Clock
Data line
Supply voltage from AB3100 internal LDO
Table 3-1-7. MicroSD card Interface
VDDE_1V8
U403
A5
VCCA
C5
DAT0_DIR
B2
DAT0A
C1
DAT123_DIR
A2
DAT1A
B4
DAT2A
A4
DAT3A
B5
CMD_DIR
B1
CMDA
A3
MICROSD_CLK CLKA
A1
CLK_F
B3
GND1
C3
GND2
C409
0.1u
MICROSD_DAT2_2V85
MICROSD_DAT3_2V85
MICROSD_CMD_2V85
MICROSD_CLK_2V85
MICROSD_DAT0_2V85
MICROSD_DAT1_2V85
VDDE_1V8
APP_GP_MMC_DETn
MICROSD SOCKET
3. TECHNICAL DESCRIPTION
VDDG_2V85
SN74AVCA406EZXYR
D5
VCCB
D2
DAT0B
D1
DAT1B
C4
DAT2B
D4
DAT3B
C2
CMDB
D3
CLKB
C410
0.1u
VDDG_2V85
GND
1
2
3
R416 2.2
4
5
6
7
S400 DM3AT-SF-PEJ
8
Hirose ( Micro-SD Socket, Normal ,T= 1.68)
ENSY0020901
SWA SWB
1608
C408
10u
VA406
EVLC18S02003
- 33 -
MICROSD_DAT0_2V85
MICROSD_DAT1_2V85
MICROSD_DAT2_2V85
MICROSD_DAT3_2V85
MICROSD_CMD_2V85
MICROSD_CLK_2V85
LGE Internal Use Only