Quectel M35 User Manual page 22

Network Status Indicator
PIN NAME PIN NO. I/O
NETLIGHT 13
UART Port
PIN NAME PIN NO. I/O
DTR 20
RXD 21
TXD 22
RTS 24
CTS 23
RI 26
DCD 25
Debug Port
PIN NAME PIN NO. I/O
DBG_
15
TXD
DBG_
14
RXD
SIM Interfaces
PIN NAME PIN NO
SIM1_
27
VDD
SIM1_
30
CLK
M35_User_Manual
DESCRIPTION
Network status
O
indication
DESCRIPTION
I Data terminal ready
I Receive data
O Transmit data
I Request to send
O Clear to send
O Ring indication
O Data carrier detection
DESCRIPTION
O Transmit data
I Receive data
I/O DESCRIPTION
Power supply for SIM1
O
card
O SIM1 clock
Confidential / Released
GSM/GPRS Module Series
DC
CHARACTERISTICS
VOHmin=
0.85×VDD_EXT
VOLmax=
0.15×VDD_EXT
DC
CHARACTERISTICS
VILmin=0V
VILmax=
0.25×VDD_EXT
VIHmin=
0.75×VDD_EXT
VIHmax=
VDD_EXT+0.2
VOHmin=
0.85×VDD_EXT
VOLmax=
0.15×VDD_EXT
DC
CHARACTERISTICS
Same as above
DC
CHARACTERISTICS
The voltage can be
selected by software
automatically. Either
1.8V or 3V.
VOLmax=
0.15×SIM1_VDD
VOHmin=
0.85×SIM1_VDD
M35 User Manual
COMMENT
If unused, keep
this pin open.
COMMENT
If only use TXD,
RXD and GND to
communicate,
recommended
connecting RTS to
GND via 0R
resistor and
keeping other pins
open.
COMMENT
If unused, keep
these pins open.
COMMENT
All signals of SIM
interfaces should
be protected
against ESD with
a TVS diode array.
Maximum trace
length is 200mm
from the module
21 / 85