Neo_M680 GPRS Module Hardware User Guide
Copyright © Neoway Technology Co., Ltd
5
2.2
Pin Definition
Table 2-1
M680 pin definition
Pin
Name
I/O
Function
Reset
Status
Level Feature
(V)
Remarks
Power Supply and Switch Interfaces
57, 58,
59, 68
VBAT
P
Main power supply
input
3.5 V to 4.3 V (3.9 V
is recommended)
36
VDD_EXT
P
2.8 V power supply
output
Supply power for IO
level shifting circuit.
Load capability: less
than 50 mA
41
VRTC
P
RTC power supply
2.8 V, maximum
charging output
current 2 mA
18, 29,
31, 46,
48, 60,
63~67,
69~71
GND
P
Ground
1
ON/OFF
DI
On/Off input
0
＜
V
IL
＜
0.6
2.1
＜
V
IH
＜
VBAT
Low level pulse can
change the On/Off
state.
45
RESET
DI
Reset input
0
＜
V
IL
＜
0.6
2.1
＜
V
IH
＜
3.1
Internally pulled up
to 2.8 V
Low level reset
Audio Interface
2
SPKP
AO
Positive electrode
of speaker output
Maximum 800
mW@8Ω
3
SPKN
AO
Negative electrode
of speaker output
4
MIC0P
AI
Positive electrode
of MIC0 output
Vpp≤200 mV
5
MIC0N
AI
Negative electrode
of MIC0 output
6
EAR_L
AO
Left sound channel
of the earphone
output
16/32Ω earphone
driving output
7
EAR_R
AO
Right sound
channel of the
earphone output
9
MIC1
AI
MIC1 output
