Quectel EG25-G - USB Application Without USB Suspension Function

LTE Module Series
EG25-G Hardware Design
EG25-G_Hardware_Design 32 / 100
The following figure shows the connection between the module and the host.
USB_VBUS
USB_DP
USB_DM
AP_READY
VDD
USB_DP
USB_DM
GPIO
Module Host
GND
GND
RI
EINT
Figure 5: Sleep Mode Application with RI
 Sending data to EG25-G through USB will wake up the module.
 When EG25-G has a URC to report, RI signal will wake up the host.
3.5.1.4. USB Application without USB Suspension Function
If the host does not support USB suspension function, USB_VBUS should be disconnected via an
additional control circuit to let the module enter into sleep mode.
 Execute AT+QSCLK=1 command to enable the sleep mode.
 Ensure the DTR is held at high level or keep it open.
 Disconnect USB_VBUS.
The following figure shows the connection between the module and the host.
USB_VBUS
USB_DP
USB_DM
AP_READY
VDD
USB_DP
USB_DM
GPIO
Module Host
RI
EINT
Power
Switch
GPIO
GND
GND
Figure 6: Sleep Mode Application without Suspension Function