Product Info

LTE Standard Module Series
EC25 Series Hardware Design
EC25_Series_Hardware_Design 30 / 134
USIM_RST
17
DO
Reset signal of
(U)SIM card
For 1.8 V (U)SIM:
V
OL
max = 0.45 V
V
OH
min = 1.35 V
For 3.0 V (U)SIM:
V
OL
max = 0.45 V
V
OH
min = 2.55 V
Main UART Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
RI
62
DO
Ring indicator
V
OL
max = 0.45 V
V
OH
min = 1.35 V
1.8 V power domain.
If unused, keep it
open.
DCD
63
DO
Data carrier
detection
V
OL
max = 0.45 V
V
OH
min = 1.35 V
1.8 V power domain.
If unused, keep it
open.
CTS
64
DO
Clear to send
V
OL
max = 0.45 V
V
OH
min = 1.35 V
1.8 V power domain.
If unused, keep it
open.
RTS
65
DI
Request to send
V
IL
min = -0.3 V
V
IL
max = 0.6 V
V
IH
min = 1.2 V
V
IH
max = 2.0 V
1.8 V power domain.
If unused, keep it
open.
DTR
66
DI
Data terminal ready,
sleep mode control
V
IL
min = -0.3 V
V
IL
max = 0.6 V
V
IH
min = 1.2 V
V
IH
max = 2.0 V
1.8 V power domain.
Pulled up by default.
Low level wakes up
the module.
If unused, keep it
open.
TXD
67
DO
Transmit data
V
OL
max = 0.45 V
V
OH
min = 1.35 V
1.8 V power domain.
If unused, keep it
open.
RXD
68
DI
Receive data
V
IL
min = -0.3 V
V
IL
max = 0.6 V
V
IH
min = 1.2 V
V
IH
max = 2.0 V
1.8 V power domain.
If unused, keep it
open.
Debug UART Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
DBG_TXD
12
DO
Transmit data
V
OL
max = 0.45 V
V
OH
min = 1.35 V
1.8 V power domain.
If unused, keep it
open.