Smart Machine Smart Decision
SIM808_Hardware Design_V1.00 2014.03.27
17
GPIO
GPIO5 43 I/O
GPIO6 44 I/O
Programmable general purpose input and
output.
NETLIGHT 50 O Network status
STATUS 49 O Power on status
Can not multiplex with
GPIO function.
Serial port
DTR 9 I Data terminal ready
RI 10 O Ring indicator
DCD 11 O Data carrier detect
CTS 12 O Clear to send
RTS 13 I Request to send
TXD 14 O Transmit data
RXD 15 I Receive data
Keep floating if
unused.
USB interface
VBUS 25 I
USB_DP 26 I/O
USB_DM 27 I/O
Debug and firmware upgrading
Keep floating if
unused.
ADC
ADC1 23
ADC2 24
I 10 bit general analog to digital converter
Keep floating if
unused.
PWM
PWM1 42 O Pulse-width modulation, multiplex with GPIO4.
PWM2 41 O Pulse-width modulation, multiplex with GPIO3.
Keep floating if
unused.
I2C
SDA 38 I/O I2C serial bus data
SCL 39 O I2C serial bus clock
Internal pulled up to
2.8V via 4.7K
SIM interface
SIM_VDD 29 O
Voltage supply for SIM card. Support 1.8V or
3V for SIM card
SIM_DATA 30 I/O SIM data input/output
SIM_CLK 31 O SIM clock
SIM_RST 32 O SIM reset
SIM_PRESENCE 33 I SIM card detection
All signals of SIM
interface should be
protected against ESD
with a TVS diode
array.
Antenna
GSM_RF_IN 66 I/O Connect GSM antenna
Impendence must be
controlled to 50.
ANT_BT 53 I/O Connect Bluetooth antenna
Impendence must be
controlled to 50.
GPS_RF_IN 35 I Connect GPS antenna
Impendence must be
controlled to 50.
RF synchronization
RF_SYNC 63 O RF burst synchronous signal Do not pull up
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