Quectel EC25-AUX Hardware Design page 28

USIM_RST 17
Main UART Interface
Pin Name Pin No.
RI 62
DCD 63
CTS 64
RTS 65
DTR 66
TXD 67
RXD 68
Debug UART Interface
Pin Name Pin No.
EC25_Hardware_Design
Reset signal of
DO
(U)SIM card
I/O Description
DO Ring indicator
Data carrier
DO
detection
DO Clear to send
DI Request to send
Data terminal ready,
DI
sleep mode control
DO Transmit data
DI Receive data
I/O Description
LTE Standard Module Series
EC25 Hardware Design
For 3.0V (U)SIM:
V max=0.45V
OL
V min=2.55V
OH
For 1.8V (U)SIM:
V max=0.45V
OL
V min=1.35V
OH
For 3.0V (U)SIM:
V max=0.45V
OL
V min=2.55V
OH
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
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.
Pulled 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
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