Usb Application Without Usb Suspend Function - Quectel RG520N-AT Hardware Design

⚫
Execute AT+QSCLK=1 to enable sleep mode.
⚫
Ensure MAIN_DTR is held at a high level or keep it open.
⚫ Ensure the host's USB bus, which is connected with the module's USB interface, enters suspend
state.
The following figure illustrates the connection between the module and the host.
⚫
Sending data to the module through USB will wake up the module.
⚫
When the module has a URC to report, the MAIN_RI signal will wake up the host.

3.2.2.3. USB Application without USB Suspend Function

If the host does not support USB suspend function, disconnect USB_VBUS with an external control circuit
to make the module enter sleep mode.
⚫
Execute AT+QSCLK=1 to enable sleep mode.
⚫
Ensure the MAIN_DTR is held at a high level or keep it open.
⚫
Disconnect USB_VBUS.
The figure illustrates the connection between the module and the host.
RG520N-AT_Hardware_Design
Figure 6: Sleep Mode Application with MAIN_RI
5G Module Series
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