Usb Application Without Usb Suspend Function - Quectel QuecOpen AG521R-NA Hardware Design

⚫
Use sleep & wakeup API to enable the sleep mode.
⚫
Ensure the level of pins that configured as wake-up interrupt in Table 5 are under non-wakeup status.
⚫ The host's USB bus, which is connected with the module's USB interface, enters suspended state.
The following figure shows the connection between the module and the host.
Figure 5: Sleep Mode Application without USB Remote Wakeup
⚫
Sending data to the module through USB will wake up the module.
⚫ When the module has URC to report, the module's GPIO signal can be used to wake up the host.

3.5.1.3. USB Application without USB Suspend Function

If the host does not support USB suspend function, USB_VBUS should be connected with an external control
circuit to set the module to sleep mode.
⚫
Use sleep API to enable the sleep mode.
⚫
Ensure the level of pins that configured as wake-up interrupt in Table 5 are under non-wakeup status.
⚫
Disconnect USB_VBUS.
The following figure shows the connection between the module and the host.
AG521R-NA_QuecOpen_Hardware_Design
USB_VBUS
USB Interface
GPIO
GND
Module
USB_VBUS
USB Interface
GPIO
GND
Module
AG521R-NA QuecOpen Hardware Design
VDD
USB Interface
EINT
GND
Host
GPIO
Power
VDD
Switch
USB Interface
EINT
GND
Host
Automotive Module Series
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