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 3.17 for
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"* command for 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=1 command to 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 EG91 through USB will wake up the module.
 When EG91 has a URC to report, the module will send remote wakeup signals via USB bus so 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 three preconditions to let the module enter into the sleep mode.
EG91_Hardware_Design
Module
USB_VBUS
USB_DP
USB_DM
AP_READY
GND
LTE Standard Module Series
EG91 Hardware Design
Host
VDD
USB_DP
USB_DM
GPIO
GND
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