Usb Application With Suspend Function - Quectel UC15 Hardware Design

The RI of module is used to wake up the processor, and AP_READY will detect the sleep state of
processor (can be configured to high level or low level detection). You should pay attention to the level
match shown in dotted line between module and processor.
Drive DTR to low level will wake up the module.

3.5.1.2. USB Application with Suspend Function

If application processor communicates with module via USB interface, and processor supports USB
suspend function, following preconditions can let the module enter into the sleep mode.

Execute AT command AT+QSCLK=1 to enable the sleep mode.

The processor's USB bus which is connected with the module USB interface enters into suspended
state.
The following figure shows the connection between the module and processor.
UC15_Hardware_Design
Figure 3: UART Sleep Application
Figure 4: USB Application with Suspend Function
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