LG KT520 Service Manual page 39

3. TECHNICAL BRIEF
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.
ACC_GP16_MC_DETECT
MICROSD_CMD_2V7
MICROSD_CLK_2V7
MICROSD_DAT_2V7
VDDG_2V75
• 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.
VDDE_1V8
C100
0.1u
MICROSD_DAT_DIR
MICROSD_DAT0
MICROSD_DAT1
MICROSD_DAT2
MICROSD_DAT3
MICROSD_CMD_DIR
MICROSD_CMD
MICROSD_CLK
APP_GP13_MC_CLKRET
Figure 3-1-12. MicroSD card and Schematic of MicroSD card Interface
LGE Internal Use Only
MicroSD card Interface
Card detection, connected to GPIO of DB3150
Command/Response
Clock
Data line
Supply voltage from AB3000 internal LDO
Table 3-1-7. MicroSD card Interface
VDDG_2V75
C101
0.1u
FL101 SN74AVCA406EZXYR
A5 D5
VCCA VCCB
C5
DAT0_DIR
B2 D2
DAT0A DAT0B MICROSD_DAT0_2V7
C1
DAT123_DIR
A2 D1
DAT1A DAT1B
B4 C4
DAT2A DAT2B
A4 D4
DAT3A DAT3B
B5
CMD_DIR
B1
CMDA
A3
CLKA
A1
CLK_F
B3 C2
GND1 CMDB MICROSD_CMD_2V7
C3 D3
GND2 CLKB MICROSD_CLK_2V7
MicroSD Level Shifter
- 40 -
VDDG_2V75
ACC_GP16_MC_DETECT
MICROSD_CMD_2V7
MICROSD_CLK_2V7
MICROSD_DAT0_2V7
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
S100
GND
DAT2_RSV
CD_DAT3_CS
CMD_DI
VDD
CLK_SCLK
VSS
DAT0_DO
DAT1_RSV
GND
SCHA1A0102
MicroSD Socket
Molex : ENSY0014101 (500873-0802)
Alps : ENSY0013501 (SCHA1A0102)