UMTS/HSPA Module Series
UG95 Hardware Design
UG95_Hardware_Design Confidential / Released 25 / 72
The following figure shows the connection between the module and processor.
USB_VBUS
USB_DP
USB_DM
VDD
USB_DP
USB_DM
Module
Processor
GND
GND
RI
EINT
Figure 4: USB Application with Suspend Function
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.
USB_VBUS
USB_DP
USB_DM
VDD
USB_DP
USB_DM
Module
Processor
RI
EINT
Power
Switch
GPIO
GND
GND
Figure 5: USB Sleep Application without Suspend Function
Quectel
Confidential