Smart Machine Smart Decision
SIM868_Series_Hardware_Design_V1.06 17 2017-07-13
3.2. Pin Description
Table 6: Pin description
Power supply
GPS_VB AT 34 I Power supply for GNSS 2.9V ~4.4V
GSM_V BAT 35 I Power supply for GSM 3.4V ~4.4V
VDD_EXT 40 O 2.8V power output If it is unused, keep open.
GND
8,13,19,21,27,30,
31,33,36,37,45,63,
66,67,69,70,71,72,
73,74,75,76,77
Ground
36、37 pins
G SM _V BAT.
Power on/off
PWRKEY 39 I
PWRKEY should be pulled low
and then released to power on/off
the module.
Internally pulled up to 3V
Audio interface
MICP 9
I Differential audio input
If these pins are unused,
keep open.
MICN 10
SPK1P 11
O Differential audio output
SPK1N 12
SPK2P 44
SPK2N 43
GNSS interface
GPS_RXD 62 I
Receive data
If these pins are unused,
keep open.
GPS_TXD 61 O
Transmit data
1PPS 60 O Time Mark outputs timing pulse
GNSS_EN 59 I GNSS power enable
VRTC 28 I/O Power supply for GNSS RTC
connect with a battery.
MCCA3 46 I/O
SD serial data I/O
If these pins are unused,
keep open.
MCCA2 47 I/O
MCCA1 48 I/O
MCCA0 49 I/O
MCCK 50 I/O SD serial clock
MCCM0 51 I/O SD command output
GPIO
NETLIGHT 41 O Network status
If these pins are unused,
keep open.
S TATU S 42 O Power on status
GPIO1 57 I/O
Programmable general purpose
input and output.
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