User's Manual

Smart Machine Smart Decision

SIM5320_Hardware Design_V1.01 2011-11-10

Sleep mode

If peripheral equipments stops working, and there is no on air or hardware interrupts (such as GPIO

interrupts or data on UART), SIM5320AD will enter sleep mode automatically. In this mode, SIM5320AD

can still receive paging，voice call or SMS from network. If USB interface of SIM5320AD is connected to

host CPU, but host CPU does not support USB suspending, then SIM5320AD will not enter sleep mode.

After USB is disconnected, SIM5320AD will enter sleep mode.

Note: When UART interface is connected with host CPU, SIM5320AD can not enter sleep mode until RXD is pulled

down by the host CPU. If the module is in the idle mode, make sure to pull the RXD to low level by host CPU. SIMCom

recommends using GPIO43 or UART_DTR to wake up the module from host CPU and to use GPIO41 or UART_RI to

wake up the host CPU. Before designing, pay attention to how to realize waking function and refer to Document[24] and

Document[25] for more detail.

Minimum functionality mode

Minimum functionality mode ceases a majority function of module, thus minimizing the power

consumption. This mode is set by the AT command which provides a choice of the functionality levels.

● AT+CFUN=0: Minimum functionality

● AT+CFUN=1: Full functionality (Default)

● AT+CFUN=4: Disable RF function of the module (Flight mode)

If SIM5320AD has been set to minimum functionality mode, the module will firstly enter sleep mode,

then the RF function and SIM card function will be closed. In this case, the serial port is still accessible,

but RF function or SIM card will be unavailable. When SIM5320AD is in minimum functionality or flight

mode, it can return to full functionality by the AT command “AT+CFUN=1”.

Note: For flight mode, please refer to Chapter3.9.2.

5.3 Current Consumption

The current consumption in suspended mode and without USB connection is listed in the table below.

Here, “suspended mode” means that SIM5320AD is connected to USB bus, but it does not transfer data.

Table 32: Current consumption

GSM Sleep mode (without USB connection)

GSM850

Sleep @DRX=2 4.5mA

Sleep @DRX=5 2.7mA

Sleep @DRX=9 2.3mA

GSM900

Sleep @DRX=2 4.5mA