Quectel EG91-EX - Page 29

LTE Standard Module Series
EG91 Series Hardware Design
EG91_Series_Hardware_Design 28 / 106
V
IH
min=1.2V
V
IH
max=2.0V
open.
PCM Interface
Pin Name Pin No. I/O Description DC Characteristics Comment
PCM_DIN 6 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_
DOUT
7 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 5 IO
PCM data frame
synchronization
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 4 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 40 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 41 OD
I2C serial data.
Used for external
codec
An external pull-up
resistor is required.
1.8V only.
If unused, keep it
open.
ADC Interface
Pin Name Pin No. I/O Description DC Characteristics Comment