Usb Application With Usb Remote Wakeup Function; Usb Application With Usb Suspend/Resume And Ri Function - Quectel EC25-V User Manual

Refer to AT command AT+QCFG="apready" for details.

3.5.1.2. USB Application with USB Remote Wakeup Function

If host supports USB suspend/resume and remote wakeup function, the following part will show the sleep
application.
There are three preconditions to let the module enter into the sleep mode.
Execute AT command AT+QSCLK=1 to enable the sleep mode.

Ensure the DTR is held in high level or keep it open.

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.
Sending data to EC25 through USB will wake up the module.

When EC25 has URC to report, the module will send remote wake-up signals to USB BUS so as to

wake up the host.

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

If host supports USB suspend/resume, but does not support remote wake-up function, the RI signal is
needed to wake up the host. The following part will show the sleep application.
There are three preconditions to let the module enter into the sleep mode.
Execute AT command AT+QSCLK=1 to enable the sleep mode.

Ensure the DTR is held in high level or keep it open.

The host's USB bus, which is connected with the module's USB interface, enters into suspended

EC25-V_User_Manual
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Module
USB_VBUS
USB_DP
USB_DM
AP_READY
GND
Figure 4: Sleep Application with USB Remote Wakeup
Confidential / Released
LTE Module Series
EC25-V User Manual
Host
VDD
USB_DP
USB_DM
GPIO
GND
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