LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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3.1.11 MicroSD Interface card
KT520 supports the MicroSD card interface as external memory card.
MicroSD card has 4-data line, so KT520 uses 4-data lines.
All control and data lines are connected to DB3150.
Cause of the difference between DB3150 and MicroSD card, a level shifter should be added.
• Card detection
- Card detection
- When there are no card in MicroSD card socket, MICROSD_DETECT pin is high cause of an
external pull-up.
- If card is inserted in socket, MICROSD_DETECTpin changes Low cause of the mechanical switch
in the socket.
- VDDG_2V75 always supply power.
- If card is removed, ACC_GP16_MC_DETECT pin changes high.
MicroSD Level Shifter
B3
GND2
C3
A5
VCCA
D5
VCCB
CLKA
D3
CLKB
CLK_F
A1
CMDA
B1
C2
CMDB
CMD_DIR
B5
B2
DAT0A
DAT0B
D2
DAT0_DIR
C5
DAT123_DIR
C1
DAT1A
A2
D1
DAT1B
B4
DAT2A
DAT2B
C4
A4
DAT3A
D4
DAT3B
GND1
VDDE_1V8
SN74AVCA406EZXYR
FL101
A3
0.1u
C101
VDDG_2V75
100K
R100
0.1u
R102
100K
C100
100K
R103
R104
100K
R101
100K
MICROSD_CMD
MICROSD_CMD_DIR
MICROSD_CMD_2V7
APP_GP13_MC_CLKRET
MICROSD_CLK_2V7
MICROSD_DAT0
MICROSD_CLK
MICROSD_DAT3
MICROSD_DAT2
MICROSD_DAT1
MICROSD_DAT_DIR
MICROSD_DAT0_2V7
MicroSD Socket
Molex : ENSY0014101 (500873-0802)
Alps : ENSY0013501 (SCHA1A0102)
R116
470K
VDDG_2V75
0.1u
VDD
VSS
C102
CD_DAT3_CS
CLK_SCLK
CMD_DI
DAT0_DO
DAT1_RSV
DAT2_RSV
GND
GND
SCHA1A0102
S100
ACC_GP16_MC_DETECT
MICROSD_CMD_2V7
MICROSD_CLK_2V7
MICROSD_DAT0_2V7
Figure 3-1-12. MicroSD card and Schematic of MicroSD card Interface
MicroSD card Interface
ACC_GP16_MC_DETECT
Card detection, connected to GPIO of DB3150
MICROSD_CMD_2V7
Command/Response
MICROSD_CLK_2V7
Clock
MICROSD_DAT_2V7
Data line
VDDG_2V75
Supply voltage from AB3000 internal LDO
Table 3-1-7. MicroSD card Interface
Z3X-BOX.COM
Содержание KT520
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