Smart Module Series
SC690A_Series_Hardware_Design 51 / 105
4.4. SD Card Interface
The module supports SD 3.0 specifications. The pin definition of the SD card interface is shown below.
Table 15: Pin Definition of SD Card Interface
A reference circuit for SD card interface is shown below.
SD_CMD
SD_DATA3
SD_DATA2
SD_CLK
SD_DATA0
SD_DET
SD_DATA1
P1-DAT2
P2-CD/DAT3
P3-CMD
P4-VDD
P5-CLK
P8-DAT1
P6-VSS
P7-DAT0
DETECTIVE
GND
Module
D1
D2
D3
D4
D5
D6
D7
D8
C1
C2
SD Card Connector
LDO9_1V8
SD_LDO22
SD_LDO5
GND
R1
R2
R3
R4
R5
R6
R7
4.7
μ
F
33 pF
33 R
33 R
33 R
33 R
33 R
33 R
1 K
R10
R11
R12
R13
R9
R8
1
2
0
K
N
M
_
5
1
K
N
M
_
5
1
K
N
M
_
5
1
K
N
M
_
5
1
K
N
M
_
1
0
K
R14
0 R
Figure 16: Reference Circuit for SD Card Interface
Pin Name
Pin No.
I/O
Description
Comment
SD_CLK
70
DO
SD card clock
SD_CMD
69
DIO
SD card command
SD_DATA0
68
DIO
SDIO data bit 0
SD_DATA1
67
DIO
SDIO data bit 1
SD_DATA2
66
DIO
SDIO data bit 2
SD_DATA3
65
DIO
SDIO data bit 3
SD_DET
64
DI
SD card hot-plug detect
Active low.
SD_LDO22
63
PO
SD card power supply
SD_LDO5
179
PO
1.8/2.95 V output power for SD card pull-up
circuits