Usb Interface - Sunsea AIoT SIMCom SIM7600NA User Manual

Smart Machine Smart Decision
Normally RI will be kept at a high level until a voice call, then it will output periodic rectangular
wave with 5900ms low level and 100ms high level. It will output this kind of periodic rectangular
wave until the call is answered or hung up.
Figure 18 : RI behaviour（voice call）
Note: For more details of AT commands about UART, please refer to document [1] and [22].
DTR pin can be used to wake MODULE from sleep. When MODULE enters sleep mode, pulling
down DTR can wake MODULE.
3.4

USB Interface

The MODULE contains a USB interface compliant with the USB2.0 specification as a peripheral,
but the USB charging function is not supported.
MODULE can be used as a USB device. MODULE supports the USB suspend and resume
mechanism which can reduce power consumption. If there is no data transmission on the USB bus,
MODULE will enter suspend mode automatically, and will be resumed by some events such as
voice call, receiving SMS, etc.
v
Figure 19: USB reference circuit
SIM7600NA_user manual _V1.00 32 2020-1-7