Quectel EC25-AUX

LTE Standard Module Series
EC25 Hardware Design
EC25_Hardware_Design 29 / 130
Pin Name Pin No. I/O Description DC Characteristics Comment
I2C_SCL 41 OD
I2C serial clock.
Used for external
codec.
An external pull-up
resistor is required.
1.8V only.
If unused, keep it
open.
I2C_SDA 42 OD
I2C serial data.
Used for external
codec.
An external pull-up
resistor is required.
1.8V only.
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
1.8V signaling:
V
OL
max=0.45V
V
OH
min=1.4V
V
IL
min=-0.3V
V
IL
max=0.58V
V
IH
min=1.27V
V
IH
max=2.0V
3.0V signaling:
V
OL
max=0.38V
V
OH
min=2.01V
V
IL
min=-0.3V
V
IL
max=0.76V
V
IH
min=1.72V
V
IH
max=3.34V
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
1.8V signaling:
V
OL
max=0.45V
V
OH
min=1.4V
V
IL
min=-0.3V
V
IL
max=0.58V
V
IH
min=1.27V
V
IH
max=2.0V
3.0V signaling:
V
OL
max=0.38V
V
OH
min=2.01V
V
IL
min=-0.3V
V
IL
max=0.76V
V
IH
min=1.72V
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.