SimCom SIM808 Hardware Design page 17

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