SimCom SIM7020C Hardware Design page 14

USB
USB_VBUS 24
USB_DP 25
USB_DN 26
UART interface
UART1_TXD 1
UART1_RXD 2
UART1_RTS 3
UART1_CTS 4
UART1_DCD 5
UART1_DTR 6
UART1_RI 7
UART2_TXD 22
UART2_RXD 23
Indicate and Control in PSM Mode
RTC_GPIO0 11
RTC_EINT 12
GPIO
NETLIGHT 41
STATUS 42
GPIO0 10
GPIO1 29
RF interface
ANT 32
Other interface
ADC 38
NC 20
SIM7020_Hardware_Design_V1.02
Valid USB detection input with
DI,PD
2.5~5.25V detection voltage
Positive line of the differential,
I/O
bi-directional USB signal.
Negative line of the differential,
I/O
bi-directional USB signal.
DOH Transmit Data
DI， PU Receive Data
DI， PU Request to send
DOH Clear to Send
DOH Data carrier detect
DI， PU Transmit Data
DOH Ring Indicator
DOH Transmit Data
DI ，P Receive Data
In PSM, RTC_GPIO0 will
change state from low to high if
DO
RTC_EINT receive interrupt
event.
RTC_EINT can be the wake up
DI
、P
source for exiting PSM.
LED control output as network
DO
status indication.
Operating status output.
High level: Power on and
DO
firmware ready
Low level: Power off
Do not pull down before power
IO
on
IO
AI antenna
Analog-digital converter input.
AI
Voltage range: 0.1-1.4V.
No connection.
13
Smart Machine Smart Decision
USB interface for
debugging
If unused, keep them
open.
Voltage Domain:
VBAT
If unused, keep them
open.
If unused, keep them
open.
Keep it open
2018-07-25