N11
Hardware User Guide
Copyright © Neoway Technology Co., Ltd
7
8
SIM_RESET
DO
SIM card reset
0<V
OL
<0.15*VSIM;
0.85*VSIM<V
OH
<VSIM
9
VSIM
P
SIM
card
power output
Network indicator
17
NET_LIGHT
DO
Network status
LED
2.8 V/4 mA output
Used
with
AT
commands
SMS and Call Reminder
18
RING
DO
Ring output
0<V
IL
<0.6;
2.1<V
IH
<3.1;
0<V
OL
<0.42;
2.38<V
OH
<2.8
Detect
incoming
voice calls or SMS
messages
Sleep Mode Control
16
DTR
DI
Sleep
mode
control
0<V
IL
<0.6;
2.1<V
IH
<3.1;
0<V
OL
<0.42;
2.38<V
OH
<2.8
Used together with
AT commands
GPRS Antenna
20
ANT
AI/O
GPRS antenna
interface
50
Ω impedance
Reserved Pins
13
DEBUG_TXD
DO
Reserve a test
point.
Do
not
connect these pins
to power supply or
ground.
14
DEBUG_RXD
DI
Reserve a test
point.
Do
not
connect these pins
to power supply or
ground.
The maximum input voltage at all IO ports (including peak signal current) cannot exceed 3.1 V
because the module uses a 2.8 V IO power system. In the application of the module, the IO output
voltage from the 3.3 V power supply system of the external circuit might greatly overshoot 3.1 V due to
the signal integrity design. In this situation, the IO pins of the module might be damaged if the IO signals
are connected to the IO port on the 2.8 V systems. To rectify this issue, take measures to match the
level. For details, see the 3.2 UART.
