Neo_M660A GPRS Module Hardware User Guide
Copyright © Neoway Technology Co., Ltd
5
2.2
Pin Definition
Table 2-1
M660A pin definition
Pin
Name
I/O
Function
Reset
Status
Level Feature
(V)
Remarks
Power Supply and Switch Interfaces
55, 56,
57
VBAT
P
Main power supply
input
3.5 V to 4.3 V
(3.9 V is
recommended)
15
VDD_EXT
P
2.8 V power supply
output
Supply power for
IO level shifting
circuit.
Load capability:
less than 50 mA
26
VRTC
P
RTC power supply
2.8 V, maximum
output charging
current 2 mA
2, 17,
18, 29,
39, 45,
46, 53,
54, 58,
59,
61-65
GND
P
Ground
1
ON/OFF
DI
ON/OFF control input
I/PU
0<V
IL
<0.6
2.1<V
IH
<VBAT
Low level pulse
can change the
ON/OFF state.
16
RESET
DI
Reset input
Internal 2.8V
pull-up
Low level reset
Audio Interface
19
MICP
AI
Positive electrode of
differential MIC
output
Vpp≤200 mV
20
MICN
AI
Negative electrode of
differential MIC
output
21
RECP
AO
Positive electrode of
differential receiver
output
32 Ω receiver
driving output
22
RECN
AO
Negative electrode of
differential receiver
output
UART Interface
