User's Manual

Smart Machine Smart Decision
SIM868_Hardware_Design_V1.00 17 2016-06-20
UART1_RXD 2 I Receive data
UART2_TXD 22 O Transmit data
UART2_RXD 23 I Receive data
Debug interface
USB_VBUS 24 I
Debug and download
If these pins are unused,
keep open.
USB_DP 25 I/O
USB_DM 26 I/O
ADC
ADC 38 I
10bit general analog to digital
converter
If these pins are unused,
keep open.
I2C
SDA 64 I/O I2C serial bus data
Internal pulled up to 2.8V
via 4.7KΩ
SCL 65 O I2C serial bus clock
SIM card interface
SIM1_VDD 18 O
Voltage supply for SIM card.
Support 1.8V or 3V SIM card
All signals of SIM interface
should be protected against
ESD with a TVS diode
array.
SIM1_DATA 15 I/O SIM data input/output
SIM1_CLK 16 O SIM clock
SIM1_RST 17 O SIM reset
SIM1_DET 14 I SIM card detection
If these pins are unused,
keep open.
SIM2_VDD 56 O
Voltage supply for SIM card.
Support 1.8V or 3V SIM card
All signals of SIM interface
should be protected against
ESD with a TVS diode
array.
SIM2_DATA 53 I/O SIM data input/output
SIM2_CLK 54 O SIM clock
SIM2_RST 55 O SIM reset
SIM2_DET 52 I SIM card detection
If these pins are unused,
keep open.
Antenna interface
GSM_ANT 32 I/O Connect GSM antenna
If these pins are unused,
keep open.
NC 20 I/O Connect Bluetooth antenna
GPS_ANT 68 I Connect GNSS antenna
Synchronizing signal of RF
RF_SYNC 29 O Synchronizing signal of RF