Quectel EG91-NAXD - Page 28

LTE Standard Module Series
EG91 Series Hardware Design
EG91_Series_Hardware_Design 27 / 106
USIM2_
PRESENCE
83 DI
(U)SIM card
insertion detection
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.
Main UART Interface
Pin Name Pin No. I/O Description DC Characteristics Comment
RI 39 DO Ring indicator
V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
If unused, keep it
open.
DCD 38 DO
Data carrier
detection
V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
If unused, keep it
open.
CTS 36 DO Clear to send
V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
If unused, keep it
open.
RTS 37 DI Request to send
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.
DTR 30 DI
Data terminal
ready.
Sleep mode
control.
V
IL
min=-0.3V
V
IL
max=0.6V
V
IH
min=1.2V
V
IH
max=2.0V
1.8V power domain.
Require pull-up
resistor by default.
Low level wakes up
the module.
If unused, keep it
open.
TXD 35 DO Transmit data
V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
If unused, keep it
open.
RXD 34 DI Receive data
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.
Debug UART Interface
Pin Name Pin No. I/O Description DC Characteristics Comment
DBG_TXD 23 DO Transmit data
V
OL
max=0.45V
V
OH
min=1.35V
1.8V power domain.
If unused, keep it
open.
DBG_RXD 22 DI Receive data
V
IL
min=-0.3V
V
IL
max=0.6V
1.8V power domain.
If unused, keep it