Smart Module Series
SA800U-WF Hardware Design
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3.12. SD Card Interface
SA800U-WF supports two SDIO interfaces (SDC2 and SDC4). The SDIO function of SDC4 is not
supported by default. As the SD card interface, SDC2 complies with SD 3.0 specifications. The pin
definition is shown below.
Table 14: Pin Definition of SD Card Interface
Pin Name
Pin No.
I/O Description
Comment
SD_LDO21A
J1-151,
J1-153,
J1-155
PO
SD card power supply
Vnom = 2.95 V
I
O
max = 800 mA
SD_LDO13A
J4-11
PO
1.8/2.95 V output power for SD card
pull-up circuits
Vnom = 1.8/2.95 V
I
O
max = 50 mA
SD_CLK
J1-45
DO
SD card clock
Control characteristic
impedance as 45
Ω.
SD_CMD
J1-47
DO
SD card command
SD_DATA0
J1-51
DIO
SDIO data bit 0
SD_DATA1
J1-53
DIO
SDIO data bit 1
SD_DATA2
J1-57
DIO
SDIO data bit 2
SD_DATA3
J1-55
DIO
SDIO data bit 3
SD_DET
J1-49
DI
SD card hot-plug detect
Active low.
SDC4_CLK
J1-86
DO
SDIO clock
SDIO function is not
supported by default.
Can be multiplexed
into GPIOs.
SDC4_CMD
J1-92
DO
SDIO command
SDC4_DATA0 J1-82
DIO
SDIO data bit 0
SDC4_DATA1 J1-84
DIO
SDIO data bit 1
SDC4_DATA2 J1-88
DIO
SDIO data bit 2
SDC4_DATA3 J1-90
DIO
SDIO data bit 3
