Smart Machine Smart Decision
SIM800_Hardware Design_V1.10
16
2018-08-13
KBR3
41
O
KBR2
42
O
KBR1
43
O
KBR0
44
O
GPIO
GPIO17
11
I/O
Programmable general purpose input
and output.
GPIO19
13
I/O
NETLIGHT
52
O
Network status
Can not multiplex with
GPIO function.
STATUS
66
O
Power on status
Serial port
DTR
3
I
Data terminal ready
Keep floating if unused.
RI
4
O
Ring indicator
DCD
5
O
Data carrier detect
CTS
7
O
Clear to send
RTS
8
I
Request to send
TXD
9
O
Transmit data
RXD
10
I
Receive data
USB interface
USB_VBUS
24
I
Debug and firmware upgrading
Keep floating if unused.
USB_DP
27
I/O
USB_DN
28
I/O
ADC
ADC
25
I
10 bit general analog to digital
converter
Keep floating if unused.
PWM
PWM0
35
O
Pulse-width modulation, multiplex
with GPIO.
Keep floating if unused.
PWM1
36
O
Pulse-width modulation, multiplex
with GPIO.
I2C
SDA
37
I/O
I2C serial bus data
Internal pulled up to 2.8V
via 4.7K
Ω
SCL
38
O
I2C serial bus clock
SIM interface
SIM_VDD
30
O
Voltage supply for SIM card. Support
1.8V or 3V for SIM card
All signals of SIM
interface should be
protected against ESD with
a TVS diode array.
SIM_DATA
31
I/O
SIM data input/output
SIM_CLK
32
O
SIM clock
SIM_RST
33
O
SIM reset
SIM_DET
34
I
SIM card detection
Antenna
GSM_ANT
60
I/O
GSM antenna port
Impendence must be
controlled to 50Ω.
