Quectel EC25-V - Page 21

LTE Module Series
EC25-V User Manual
EC25-V_User_Manual Confidential / Released 20 /
69
PCM_IN
24
DI
PCM data input.
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
V
IH
max=2.0V
1.8V power domain.
If unused, keep it
open.
PCM_OUT
25
DO
PCM data output.
V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
If unused, keep it
open.
PCM_SYNC
26
IO
PCM data frame
sync signal.
V
OL
max=0.45V
V
OH
min=1.35V
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
V
IH
max=2.0V
1.8V power domain.
In master mode, it is
an output signal. In
slave mode, it is an
input signal.
If unused, keep it
open.
PCM_CLK
27
IO
PCM clock.
V
OL
max=0.45V
V
OH
min=1.35V
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
V
IH
max=2.0V
1.8V power domain.
In master mode, it is
an output signal. In
slave mode, it is an
input signal.
If unused, keep it
open.
I2C Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
I2C_SCL
41
OD
I2C serial clock.
Used for external
codec.
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.
External pull-up
resistor is required.
1.8V only. If unused,
keep it open.
RF Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
ANT_DIV
35
AI
Diversity antenna.
50ohm impedance.
If unused, keep it
open.
ANT_MAIN
49
IO
Main antenna.
50ohm impedance.
ANT_GNSS
47
AI
GNSS antenna.
50ohm impedance.
If unused, keep it
open.
GPIO Pins
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment