Quectel EG91 Series Hardware Design page 28

USIM2_
83
PRESENCE
Main UART Interface
Pin Name Pin No.
RI 39
DCD 38
CTS 36
RTS 37
DTR 30
TXD 35
RXD 34
Debug UART Interface
Pin Name Pin No.
DBG_TXD 23
EG91_Hardware_Design
(U)SIMcard
DI
insertion detection
I/O Description
DO Ring indicator
Data carrier
DO
detection
DO Clear to send
DI Request to send
Data terminal
DI ready. Sleep mode
control.
DO Transmit data
DI Receive data
I/O Description
DO Transmit data
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EG91 Hardware Design
V min=2.55V
OH
V min=-0.3V
IL
V max=0.6V
IL
V min=1.2V
IH
V max=2.0V
IH
DC Characteristics
V max=0.45V
OL
V min=1.35V
OH
V max=0.45V
OL
V min=1.35V
OH
V max=0.45V
OL
V min=1.35V
OH
V min=-0.3V
IL
V max=0.6V
IL
V min=1.2V
IH
V max=2.0V
IH
V min=-0.3V
IL
V max=0.6V
IL
V min=1.2V
IH
V max=2.0V
IH
V max=0.45V
OL
V min=1.35V
OH
V min=-0.3V
IL
V max=0.6V
IL
V min=1.2V
IH
V max=2.0V
IH
DC Characteristics
V max=0.45V
OL
V min=1.35V
OH
LTE Module Series
1.8V power domain.
If unused, keep it
open.
Comment
1.8V power domain.
If unused, keep it
open.
1.8V power domain.
If unused, keep it
open.
1.8V power domain.
If unused, keep it
open.
1.8V power domain.
If unused, keep it
open.
1.8V power domain.
Pull-up by default.
Low level wakes up
the module.
If unused, keep it
open.
1.8V power domain.
If unused, keep it
open.
1.8V power domain.
If unused, keep it
open.
Comment
1.8V power domain.
If unused, keep it