Sdio Interface - Quectel EC200A Series Hardware Design

to the host RTS.

4.6. SDIO Interface

The module provides one SD card interface which supports SD 3.0 protocol.
Table 19: Pin Definition of SD Card Interface
Pin Name
SD_SDIO_CLK
SD_SDIO_CMD
SD_SDIO_DATA0
SD_SDIO_DATA1
SD_SDIO_DATA2
SD_SDIO_DATA3
SD_SDIO_VDD
SD_DET*
The following figure illustrates a reference design of SD card interface with the module.
Module
SD_SDIO_VDD
SD_SDIO_DATA3
SD_SDIO_DATA2
SD_SDIO_DATA1
SD_SDIO_DATA0
SD_SDIO_CLK
SD_SDIO_CMD
SD_DET
Pin No. I/O
32 DO
33 DIO
31 DIO
30 DIO
29 DIO
28 DIO
34 PO
23 DI
R7 R8 R9 R10
NM NM NM
R1 0R
R2 0R
R3 0R
R4 0R
R5 0R
R6 0R
C1 D1 C2 D2 C3 D3 C4
NM NM NM
Figure 25: Reference Circuit of SD Card Interface
Description
SD card SDIO clock
SD card SDIO
command
SD card SDIO bit 0
SD card SDIO bit 1
SD card SDIO bit 2
SD card SDIO bit 3
SD card SDIO power
supply
SD card hot-plug
detect
+
C10
R11
100 uF
NM NM
D4 C5 D5 C6 D6
D7
NM NM NM
LTE Standard Module Series
Comment
1.8/2.8 V power
domain.
If unused, keep it
open.
1.8 V power domain.
If unused, keep it
open.
SD Card Connector
VDD_3V
VDD
C9 C8 C7
100 nF 33 pF 10 pF
CD/DAT3
DAT2
DAT1
DAT0
CLK
CMD
DETECTIVE
VSS