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UMTS/HSPA Module Series

UC20 Hardware Design

UC20_Hardware_Design Confidential / Released 26 / 82

match shown in dotted line between module and processor.

Driving 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, the 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.

USB_VBUS

USB_DP

USB_DM

AP_READY

VDD

USB_DP

USB_DM

GPIO

Module

Processor

GND

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 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.

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