Usb Application Without Usb Suspend Function - Quectel EC25-V User Manual

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, RI signal will wake up the host.


3.5.1.4. USB Application without USB Suspend Function

If host does not support USB suspend function, you should disconnect USB_VBUS with additional control
circuit to let the module enter into 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.

Disconnect USB_VBUS.

The following figure shows the connection between the module and the host.
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Module
USB_VBUS
USB_DP
USB_DM
AP_READY
RI
GND
Figure 5: Sleep Application with RI
Module
USB_VBUS
USB_DP
USB_DM
RI
AP_READY
GND
Figure 6: Sleep Application without Suspend Function
Confidential / Released
Host
VDD
USB_DP
USB_DM
GPIO
EINT
GND
Host
GPIO
Power
VDD
Switch
USB_DP
USB_DM
EINT
GPIO
GND
LTE Module Series
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