Usb Application With Usb Remote Wakeup Function; Usb Application With Usb Suspend/Resume And Wowwan# Functions - Quectel EM05 Hardware Design

3.4.1.1. USB Application with USB Remote Wakeup Function

If the host supports USB suspend/resume and remote wakeup function, the following two preconditions
must be met to let the module enter into the sleep mode.

Execute AT+QSCLK=1 command to enable the sleep mode.
 The host's USB bus, which is connected with the module's USB interface, enters into suspended
state.
The following figure shows the connection between the module and the host.
Figure 3: Sleep Mode Application with USB Remote Wakeup

Sending data to EM05 through USB will wake up the module.

When EM05 has a URC to report, the module will send remote wake-up signals via USB bus so as to
wake up the host.

3.4.1.2. USB Application with USB Suspend/Resume and WOWWAN# Functions

If the host supports USB suspend/resume, but does not support remote wake-up function, the
WOWWAN# signal is needed to wake up the host.
There are two preconditions to let the module enter into the sleep mode.

Execute AT+QSCLK=1 command to enable the sleep mode.
 The host's USB bus, which is connected with the module's USB interface, enters into suspended
state.
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