Smart Machine Smart Decision
5.2.2
Minimize Power Consumption
There are two modes that SIM5320J-TE achieves low power consumption.
Sleep mode
If peripheral equipments stops working, and there is no on air or hardware interrupts (such as GPIO
interrupts or data on UART), SIM5320J-TE will enter sleep mode automatically. In this mode,
SIM5320J-TE can still receive paging
,
voice call or SMS from network. If USB interface of SIM5320J-TE
is connected to host CPU, but host CPU does not support USB suspending, then SIM5320J-TE will not
enter sleep mode. After USB is disconnected, SIM5320J-TE will enter sleep mode.
Note: When UART interface is connected with host CPU, SIM5320J-TE 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 SIM5320J-TE 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 SIM5320J-TE 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 Chapter3.10.2.
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 SIM5320J-TE is connected to USB bus, but it does not transfer data.
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