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FIBOCOM SC138-
NA
Series Hardware Guide
48/88
3.8
SDIO Interface
SC138 supports 1-channel SDIO interfaces, and the pin definition is shown in the following table:
Table 3-11 Definition of pins of SDIO interfaces
Pin No.
Pin Name
I/O
Description
Remarks
SDC2_DATA3
34
I/O
SD data interface
-
SDC2_DATA2
33
I/O
SD data interface
-
SDC2_DATA1
32
I/O
SD data interface
-
SDC2_DATA0
31
I/O
SD data interface
-
SDC2_CLK
29
DO
SD clock
-
SDC2_CMD
30
I/O
SD command interface
-
SD_CARD_DET_N
35
DI
SD detection
-
VREG_L22A_2P96
28
PO
SD power supply
-
The reference circuit design of SDIO interfaces is shown in the following figure:
Figure 3-13 Reference circuits of SDIO interfaces
SDIO interface design considerations: