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

The following figure shows the connection between the module and the host.
Figure 3: Sleep Mode Application with USB Remote Wakeup
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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 module will send remote wakeup signals via USB bus to
wake up the host.
NOTE
The AP_READY is active low and the default state is high.

3.2.2.1. 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. There are three preconditions to let the module enter sleep mode.
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Execute AT+QSCLK=1 to enable the sleep mode.
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Ensure the MAIN_DTR is held at high level or kept open.
The host's USB bus, which is connected with the module's USB interface, enters Suspend state.
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UC200A-GL_Hardware_Design
Module
USB_VBUS
USB_DP
USB_DM
AP_READY
GND
UMTS/HSPA+ Module Series
Host
VDD
USB_DP
USB_DM
GPIO
GND
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