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UMTS/HSPA Module Series

UC20 Hardware Design

UC20_Hardware_Design Confidential / Released 27 / 82

The following figure shows the connection between the module and application processor.

USB_VBUS

USB_DP

USB_DM

AP_READY

VDD

USB_DP

USB_DM

GPIO

Module Processor

EINT

Power

Switch

GPIO

GND

Figure 5: USB Sleep Application without Suspend Function

Supply power to USB_VBUS will wake up the module.

In sleep mode, module can still receive paging, SMS, voice call and TCP/UDP data from network, but the

UART port is not accessible. When the module enters into the sleep mode, the SLEEP_IND will output a

high logic level.

For more details about power saving mode, please refer to document [8].

3.5.2. Airplane Mode

When module enters into the airplane mode, the RF function does not work, and all AT commands

correlative with RF function will be not accessible. This mode can be set with the following way.

Hardware:

The W_DISABLE# pin is pulled up by default, drive it to low level will let the module enter into airplane

mode.

Software:

Command AT+CFUN provides the choice of the functionality level <fun>=0, 1, 4.

AT+CFUN=0: Minimum functionality mode, both USIM and RF function are disabled.

AT+CFUN=1: Full functionality mode (by default).

AT+CFUN=4: Airplane mode. RF function is disabled.

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