Smart Module Series
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4.4. SD Card Interface
The SD card interface of the module supports SD 3.0 specifications. The pin definition of the interface is
shown below.
Table 14: Pin Definition of SD Card Interface
A reference circuit for SD card interface is shown below.
SD_CMD
120K
NM_51K
SD_DATA3
SD_DATA2
VDD1V85
SD_CLK
SD_DATA0
SD_DET
SD_DATA1
P1-DAT2
P2-CD/DAT3
P3-CMD
P4-VDD
P5-CLK
P8-DAT1
GND
P6-VSS
P7-DAT0
DETECTIVE
GND
GND
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
VDDSD
33R
33R
33R
33R
33R
33R
1K
33 pF
4.7
μF
VDDSDIO
Module
R1
R2
R3
R4
R5
R6
NM_51K NM_10K NM_51K NM_51K
R7
R8
R9
R10
R11
R12
R13
D1
D2
D3
D4
D5
D6
D7
D8
C1
C2
SD Card Connector
Figure 20: Reference Circuit for SD Card Interface
Pin Name
Pin No.
I/O
Description
Comment
VDDSD
38
PO
Power supply for SD card
It is suggested to add an LDO
with output current of 1 A if an
external
large-capacity
SD
card is needed.
VDDSDIO
32
PO
Power supply for SDIO
pull-up circuit
Only for SD_DATA and
SD_CMD pull-up circuits.
SD_DATA0
41
DIO
SDIO data bit 0
50 Ω single-ended impedance.
SD_DATA1
42
DIO
SDIO data bit 1
SD_DATA2
43
DIO
SDIO data bit 2
SD_DATA3
44
DIO
SDIO data bit 3
SD_CMD
40
DIO
SD card command
SD_CLK
39
DO
SD card clock
SD_DET
45
DI
SD card hot-plug detect
Active low.