LTE-A Module Series
EG18 Hardware Design
EG18_Hardware_Design 27 / 104
V
IH
min=1.2V
V
IH
max=2.0V
open.
BT UART interface
pin by default.
Can be multiplexed
into SPI_CS.
PCM & I2C Interfaces
Pin Name
Pin No.
I/O
Description
DC Characteristics Comment
I2C_SDA
42
OD
I2C serial interface
used for external
codec
1.8V power domain.
An external pull-up
resistor is required.
If unused, keep it open.
I2C_SCL
43
OD
PCM_SYNC
65
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_IN
66
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_CLK
67
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.
PCM_OUT
68
DO
PCM data output
V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
If unused, keep it open.
I2S_MCLK
152
DO
Clock output
Provide a digital clock
output for an external
audio codec.
If unused, keep it open.
Antenna Interfaces
Pin Name
Pin No.
I/O
Description
DC Characteristics Comment
ANT_MAIN
107
IO
Support all band main
antenna interface
50Ω impedance
ANT_DIV
127
AI
Support all band RXD
antenna interface
50Ω impedance
If unused, keep