Sunsea AIoT SimCom SIM7090G User Manual page 32

Normally RI will keep high level until certain conditions such as receiving SMS, or a URC report coming,
then it will output a low level pulse 120ms, in the end, it will become high level.
3.3.3. DTR Behavior
Perform the following operations in turn, and the module will enter sleep mode.
Setting the AT command "AT+CSCLK=1".

Drive DTR to high level.

In sleep mode, the UART is unavailable. And pulling down DTR can wake up module.
After setting the AT command "AT+CSCLK=0", SIM7090G will do nothing when the DTR pin is pulling up.
NOTE
For more details of AT commands about UART, please refer to document [1] and [20].
3.4 USB Interface
SIM7090G has a USB2.0 interface. The USB interface is used for AT command communication, data
transmission, software debugging and firmware upgrade. The following table shows the pin definition of
USB interface.
Table 14: Pin Definition of USB Interface
Pin Name
USB_VBUS
USB_DP
www.simcom.com
Figure 13: RI behaviour（SMS and URC report）
Pin No. I/O Description
12 PI USB connection detection
11 IO USB differential data bus (+)
SIM7090G User Manual V1.01
Comment
The input range is
1.3V~1.8V
Require differential
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