Usb Application With Usb Suspend/Resume And Main_Ri Wakeup Function - Quectel EG915U Series Hardware Design

3.2.2.2. USB Application with USB Suspend/Resume and MAIN_RI Wakeup Function

If the host supports USB Suspend/Resume, but does not support remote wakeup function, the MAIN_RI
signal is needed to wake up the host.
The following figure shows the connection between the module and the host.
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Sending data to the module through USB will wake up the module.
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When the module has a URC to report, the URC will trigger the behavior of MAIN_RI pin.
EG915U_Series_Hardware_Design
Module
USB_VBUS
USB_DP
USB_DM
AP_READY
MAIN_RI
GND
Figure 5: Sleep Mode Application with MAIN_RI
LTE Standard Module Series
Host
VDD
USB_DP
USB_DM
GPIO
EINT
GND
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