Product Info

LTE Standard Module Series
EC25 Series Hardware Design
EC25_Series_Hardware_Design 32 / 134
codec.
required.
If unused, keep it
open.
I2C_SDA
42
OD
I2C serial data.
Used for external
codec.
An external 1.8 V
pull-up resistor is
required.
If unused, keep it
open.
SD Card Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
SDC2_
DATA3
28
IO
SD card SDIO bus
DATA3
1.8 V signaling:
V
OL
max = 0.45 V
V
OH
min = 1.4 V
V
IL
min = -0.3 V
V
IL
max = 0.58 V
V
IH
min = 1.27 V
V
IH
max = 2.0 V
3.0 V signaling:
V
OL
max = 0.38 V
V
OH
min = 2.01 V
V
IL
min = -0.3 V
V
IL
max = 0.76 V
V
IH
min = 1.72 V
V
IH
max = 3.34 V
SDIO signal level can
be selected according
to SD card supported
level, please refer to
SD 3.0 protocol for
more details.
If unused, keep it
open.
SDC2_
DATA2
29
IO
SD card SDIO bus
DATA2
1.8 V signaling:
V
OL
max = 0.45 V
V
OH
min = 1.4 V
V
IL
min = -0.3 V
V
IL
max = 0.58 V
V
IH
min = 1.27 V
V
IH
max = 2.0 V
3.0 V signaling:
V
OL
max = 0.38 V
V
OH
min = 2.01 V
V
IL
min = -0.3 V
V
IL
max = 0.76 V
V
IH
min = 1.72 V
V
IH
max = 3.34 V
SDIO signal level can
be selected according
to SD card supported
level, please refer to
SD 3.0 protocol for
more details.
If unused, keep it
open.
SDC2_
DATA1
30
IO
SD card SDIO bus
DATA1
1.8 V signaling:
V
OL
max = 0.45 V
SDIO signal level can