LTE Standard Module Series
EC200T Series Hardware Design
EC200T_Series_Hardware_Design 49 / 90
It is recommended to reserve an RC (R=22
Ω
, C=22 pF) circuit on the PCM lines, especially for
PCM_CLK.
3.12. SD Card Interface
EC200T series provides an SD card interface, which complies with SD 3.0 specification.
The following table shows the pin definition of SD card interface.
Table 17: Pin Definition of SD Card Interface
Pin Name
Pin No.
I/O
Description
Comment
SD_DET*
23
DI
SD card detect
1.8/2.8 V power domain.
If unused, keep it open.
SD_SDIO_DATA3
28
IO
SD card SDIO data bit 3
1.8/2.8 V power domain.
If unused, keep it open.
SD_SDIO_DATA2
29
IO
SD card SDIO data bit 2
1.8/2.8 V power domain.
If unused, keep it open.
SD_SDIO_DATA1
30
IO
SD card SDIO data bit 1
1.8/2.8 V power domain.
If unused, keep it open.
SD_SDIO_DATA0
31
IO
SD card SDIO data bit 0
1.8/2.8 V power domain.
If unused, keep it open.
SD_SDIO_CLK
32
DO
SD card SDIO clock
1.8/2.8 V power domain.
If unused, keep it open.
SD_SDIO_CMD
33
IO
SD card SDIO command
1.8/2.8 V power domain.
If unused, keep it open.
SD_SDIO_VDD 34 PO
SD card SDIO power
supply
1.8/2.8 V power domain.
If unused, keep it open.
The following figure shows a reference design of SD card interface.
NOTE