Usb Application Without Suspend Function; Minimum Functionality Mode - Quectel UC15 Hardware Design

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 function, you should disconnect USB_VBUS with additional control circuit to let the module
enter into sleep mode.

Execute AT command AT+QSCLK=1 to enable the sleep mode.

Disconnect USB_VBUS.
The following figure shows the connection between the module and application processor.
Figure 5: USB Sleep Application without Suspend Function
Supply power to USB_VBUS will wake up the module.
In sleep mode, the module can still receive paging message, SMS, voice call and TCP/UDP data from the
network normally, but the UART port is not accessible.

3.5.2. Minimum Functionality Mode

Minimum functionality mode reduces the functionality of the module to minimum level, thus minimizes the
current consumption at the same time. This mode can be set as below:
Command AT+CFUN provides the choice of the functionality levels: <fun>=0, 1, 4.
 AT+CFUN=0: Minimum functionality, RF part and USIM card will be closed.

AT+CFUN=1: Full functionality (by default).
UC15_Hardware_Design Confidential / Released
UMTS/HSDPA Module Series
UC15 Hardware Design
27 / 78