User's Manual

Smart Machine Smart Decision
SIM868_Hardware_Design_V1.00 16 2016-06-20
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
GND for VBAT recommend
to use 36,37pin
Power on/down
PWRKEY 39 I
PWRKEY should be pulled low
and then released to power
on/down the module.
Internally pulled up to 3V.
Audio interfaces
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
related to receiver time
GPS_EN 59 I GNSS power enable
VRTC 28 I/O Power supply for GNSS RTC
It is recommended to
connect with a battery.
SD interface
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.
STATUS 42 O Power on status
GPIO1 57 I/O
Programmable general purpose
input and output.
GPIO2 58 I/O
Serial port
UART1_DTR 6 I Data terminal ready
If these pins are unused,
keep open.
UART1_RI 7 O Ring indicator
UART1_DCD 5 O Data carrier detect
UART1_CTS 4 O Clear to send
UART1_RTS 3 I Request to send
UART1_TXD 1 O Transmit data