Neo_M660A GPRS Module Hardware User Guide
Copyright © Neoway Technology Co., Ltd
6
7
CTS
DI
Clear to send
I/PU
0<V
IL
<0.6
2.1<V
IH
<3.1
0<V
OL
<0.42
2.38<V
OH
<2.8
With internal
47K resistors to
respectively pull
CTS and URXD
up to 2.8 V
8
RTS
DO
Request to send
I/PU
9
UTXD
DO
UART data transmit
O/PU
10
URXD
DI
UART data receive
I/PU
SIM Card
30
VSIM
P
SIM card power
supply output
0<V
IL
<0.25*VSI
M
0.75*VSIM<V
IH
<VSIM
0<V
OL
<0.15*VS
IM
0.85*VSIM<V
OH
<VSIM
Compatible with
1.8/3.0 V SIM
card
31
SIM_DATA DI/O
SIM card data I/O
0<V
IL
<0.6
2.1<V
IH
<3.1
0<V
OL
<0.42
2.38<V
OH
<2.8
33
SIM_CLK
DO
SIM card clock output
32
SIM_RST
DO
SIM card reset output
LED Indicators
52
LIGHT
DO
Status LED
I/PD
2.8 V/4 mA
output
Sleep Mode Controlling
3
DTR
DI
Sleep mode
controlling input
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
4
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
25
ADC_IN
AI
10-bit ADC input
Detectable
voltage range: 0
V to 2.8 V
GPRS Antenna
60
GPRS_ANT AI/O
GPRS antenna
interface I/O
50 Ω impedance