Smart Machine Smart Decision
SIM868_Series_Hardware_Design_V1.06
18
2017-07-13
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
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 it is unused, keep open.
I2C
SDA
64
I/O I2C serial bus data
Should be pulled up to 2.8V
via 4.7K resistor externally
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.
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 it is 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.
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 it is unused, keep open.
Antenna interface
GSM_ANT
32
I/O Connect GSM antenna
If these pins are unused,
keep open.
BT_ANT
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
SIMCOM
CONFIDENTIAL
FILE
