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MAIN_DCD
38
MAIN_TXD
35
MAIN_RI
39
MAIN_DTR
30
Auxiliary UART Interface
Pin Name
Pin No.
AUX_TXD
27
AUX_RXD
28
Debug UART Interface
Pin Name
Pin No.
DBG_RXD
22
DBG_TXD
23
I2C Interface
Pin Name
Pin No.
I2C _SCL
40
I2C _SDA
41
EG915U_Series_Hardware_Design
Main UART data carrier
DO
detect
DO
Main UART transmit
Main UART ring
DO
indication
Main UART data terminal
DI
ready
I/O
Description
DO
Auxiliary UART transmit
DI
Auxiliary UART receive
I/O
Description
DI
Debug UART receive
DO
Debug UART transmit
I/O
Description
OD
I2C serial clock
OD
I2C serial data
LTE Standard Module Series
V
max = 0.45 V
OL
V
min = 1.35 V
OH
V
max = 0.45 V
OL
V
min = 1.35 V
OH
V
max = 0.45 V
OL
V
min = 1.35 V
OH
V
min = -0.3 V
IL
V
max = 0.6 V
IL
V
min = 1.26 V
IH
V
max = 2.0 V
IH
DC Characteristics
V
max = 0.45 V
OL
V
min = 1.35 V
OH
V
min = -0.3 V
IL
V
max = 0.6 V
IL
V
min = 1.26 V
IH
V
max = 2.0 V
IH
DC Characteristics
V
min = -0.3 V
IL
V
max = 0.6 V
IL
V
min = 1.26 V
IH
V
max = 2.0 V
IH
V
max = 0.45 V
OL
V
min = 1.35 V
OH
DC Characteristics
comment
1.8 V power
domain.
If unused, keep it
open.
1.8 V power
domain.
If unused, keep it
open.
Comment
1.8 V power
domain.
If unused, keep it
open.
Comment
External pull-up
resistor is
required.
1.8 V only.
If unused, keep it
open.
The I2 C
interface
supports
simultaneous
20 / 81
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