Neo_M680 GPRS Module Hardware User Guide
Copyright © Neoway Technology Co., Ltd
6
10
RECN
AO
Negative electrode
of receiver output
32 Ω receiver
driving output
11
RECP
AO
Negative electrode
of receiver output
UART Interface
34
RTS
DI
Request to send
I/PD
0
＜
V
IL
＜
0.6
2.1
＜
V
IH
＜
3.1
0
＜
V
OL
＜
0.42
2.38
＜
V
OH
＜
2.8
With 47K pull-up
inside
35
CTS
DO
Clear to send
I/PD
37
URXD
DI
UART data receive I/PU
38
UTXD
DO
UART data
transmit
SIM Card
19
SIM_CLK
DO
SIM card clock
output
0
＜
V
IL
＜
0.25*VSIM
，
0.75*VSIM
＜
V
IH
＜
VSIM
0
＜
V
OL
＜
0.15*VSIM
0.85*VSIM
＜
V
OH
＜
VSIM
Compatible with
1.8/3.0 V SIM card
20
SIM_DATA DI/O SIM card data IO
21
SIM_RST
DO
SIM card reset
output
22
VSIM
P
SIM card power
supply output
LED Indicators
44
LIGHT
DO
Status LED
I/PD
2.8 V/4 mA output
Sleep Mode Controlling
42
DTR
DI
Signal for
controlling sleep
mode
I/PD
0
＜
V
IL
＜
0.6
2.1
＜
V
IH
＜
3.1
0
＜
V
OL
＜
0.42
2.38
＜
V
OH
＜
2.8
Low level by default
Used together with
AT commands
SMS and Incoming Call Ring
43
RING
DO
Ring output
I/PD
0
＜
V
IL
＜
0.6
2.1
＜
V
IH
＜
3.1
0
＜
V
OL
＜
0.42
2.38
＜
V
OH
＜
2.8
Detect incoming
SMS messages or
calls
ADC Detecting
56
ADC_IN
AI
10-bit ADC input
Detectable voltage
range: 0 V to 2.8 V
GPRS Antenna
