Usb Application Without Suspend Function - Quectel UG95 Hardware Design

The following figure shows the connection between the module and processor.
When the processor's USB bus returns to resume state, the module will be woken up.

3.5.1.3. USB Application without Suspend Function

If application processor communicates with module via USB interface, and processor does not support
USB suspend/resume function. So processor should disconnect USB_VBUS with additional control circuit
to let the module enter into sleep mode.

Execute AT command AT+QCFG="uart/power",1,2 to close internal UART port.

Execute AT command AT+QCFG="uart/power",0,0 to set UART into auto on/off mode.

Execute AT command AT+QSCLK=1 to enable the sleep mode.

Disconnect USB_VBUS.
Supply power to USB_VBUS will wake up the module.
The following figure shows the connection between the module and application processor.
Figure 5: USB Sleep Application without Suspend Function
UG95_Hardware_Design
Module
USB_VBUS
USB_DP
USB_DM
RI
GND
Figure 4: USB Application with Suspend Function
Module
USB_VBUS
USB_DP
USB_DM
RI
GND
Confidential / Released
Processor
VDD
USB_DP
USB_DM
EINT
GND
Processor
GPIO
Power
VDD
Switch
USB_DP
USB_DM
EINT
GND
UMTS/HSPA Module Series
UG95 Hardware Design
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