SimCom SIM800 Hardware Design page 16

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