Quectel EG915U-EU Manual page 22

Main UART Interface
Pin Name Pin No.
MAIN_CTS 36
MAIN_RTS 37
MAIN_RXD 34
MAIN_DCD 38
MAIN_TXD 35
MAIN_RI 39
MAIN_DTR 30
AUX UART Interface
Pin Name Pin No.
AUX_TXD 27
AUX_RXD 28
Debug UART Interface
Pin Name Pin No.
DBG_RXD 22
EG915U-EU_Hardware_Design
I/O Description
DO Main UART clear to send
Main UART request to
DI
send
DI Main UART receive
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 transmit
LTE Standard Module Series
V max = 2.0 V this pin open
IH
DC
Comment
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
V min = -0.3 V
IL
V max = 0.6 V
IL
V min = 1.26 V
1.8 V power
IH
V max = 2.0 V
domain.
IH
V max = 0.45 V If unused, keep it
OL
V min = 1.35 V open.
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
comment
Characteristics
1.8 V power
V max = 0.45 V domain.
OL
V min = 1.35 V If unused, keep it
OH
open.
V min = -0.3 V 1.8 V power
IL
V max = 0.6 V domain.
IL
V min = 1.26 V If unused, keep it
IH
V max = 2.0 V open.
IH
DC
Comment
Characteristics
V min = -0.3 V 1.8 V power
IL
V max = 0.6 V domain.
IL
V min = 1.26 V If unused, keep it
IH
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