Product Info

LTE Module Series
EC21 Hardware Design
EC21_Hardware_Design
3-25
/ 105
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
SDC2_
DATA0
31
IO
SD card SDIO bus
DATA0
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, more details
please refer to SD 3.0
protocol.
If unused, keep it
open.
SDC2_CLK
32
DO
SD card SDIO bus
clock
1.8V signaling:
V
OL
max=0.45V
V
OH
min=1.4V
3.0V signaling:
V
OL
max=0.38V
V
OH
min=2.01V
SDIO signal level can
be selected according
to SD card supported
level, more details
please refer to SD 3.0
protocol.
If unused, keep it
open.
SDC2_CMD
33
IO
SD card SDIO bus
command
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, more details
please refer to SD 3.0
protocol.
If unused, keep it
open.