Usb Application With Usb Remote Wakeup Function; Usb Application With Usb Suspend/Resume And Ri Function - Quectel EG91 Series Hardware Design

 When EG91 has a URC to report, RI signal will wake up the host. Please refer to Chapter 3.17for
details about RI behavior.
 AP_READY will detect the sleep state of host (can be configured to high level or low level detection).
Please refer to AT+QCFG="apready"*commandfor details.
NOTE
"*" means under development.

3.5.1.2. USB Application with USB Remote Wakeup Function

If the host supports USB suspend/resume and remote wakeup functions, the following three preconditions
must be met to let the module enter into sleep mode.
Execute AT+QSCLK=1commandto enable sleep mode.

 Ensure the DTR is held at high level or keep it open.
 The host's USB bus, which is connected with the module's USB interface, enters into suspend state.
The following figure shows the connection between the module and the host.
Figure 4: Sleep Mode Application with USB Remote Wakeup
 Sending data to EG91through USB will wake up the module.
 When EG91has a URC to report, the module will send remote wakeup signals via USB busso as to
wake up the host.

3.5.1.3. USB Application with USB Suspend/Resume and RI Function

If the host supports USB suspend/resume, but does not support remote wakeup function, the RI signal is
needed to wake up the host.
There are threepreconditions to let the module enter into the sleep mode.
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EG91 Hardware Design