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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. TECHNICAL BRIEF
3.1.12 MicroSD Interface card
TU750 supports the MicroSD card interface as external memory card.
MicroSD card has 4-data line, so
TU750
uses 4-data line.
All control and data line is 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, REAL_MICROSD_DAT3 pin is high cause
of an internal pull-up.
- If Card is inserted in socket, The pull up can be disconnected by using SET_CLR_DETECT
command.
- VDDG_2V75 always supply power.
- If card is removed,
REAL_MICROSD_DAT3
pin changes high.
Figure 3-1-12. MicroSD card and Schematic of MicroSD card Interface
MicroSD card Interface
MICROSD_CMD
Command/Response
MICROSD_CLK
Clock
MICROSD_DAT
Data line
VDDG_2V75
Supply voltage from AB3100 internal LDO
VDDG_2V85
R805
100K
D2
DAT0B
C5
DAT0_DIR
C1
DAT123_DIR
A2
DAT1A
DAT1B
D1
DAT2A
B4
C4
DAT2B
DAT3A
A4
DAT3B
D4
B3
GND1
C3
GND2
VCCA
A5
VCCB
D5
SN74AVCA406EZXYR
CLKA
A3
CLKB
D3
A1
CLK_F
B1
CMDA
CMDB
C2
B5
CMD_DIR
DAT0A
B2
U802
R808
470K
100K
R803
R802
100K
C802
smd_0603h_3_r
0.1u
VDDE_1V8
0.1u
smd_0603h_3_r
C801
100K
R804
VDDE_1V8
DNI
R806
MICROSD_DAT3
MICROSD_CLK
MICROSD_CLK_2V85
MICROSD_CMD_2V85
MICROSD_DAT0_2V85
MICROSD_DAT1_2V85
MICROSD_DAT2_2V85
MICROSD_DAT3_2V85
MICROSD_DAT0
MICROSD_CMD
MICROSD_DAT2
MICROSD_DAT1
MICROSD_CMD_DIR
MICROSD_DAT_DIR
APP_MMC_FB_CLK
Содержание TU750
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