SimCom SIM5320AL, User Manual

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SIM5320AL_User Manual_V1.01 2014-08-20 54
5.2.1 Operating Modes Overview
Table 41: Operating Modes Overview
Mode Function
Sleep mode
WCDMA
SLEEP
Module will automatically enter SLEEP mode if DTR is set to high
level and there is no on air or hardware interrupt (such as GPIO
interrupt or data on serial port).
In this case, the current consumption of module will be reduced to the
minimal level.
In SLEEP mode, the module can still receive paging message
，
voice
call and SMS.
WCDMA
WCDMA
IDLE Module has registered to the WCDMA network, and the module is
ready to communicate.
WCDMA
TALK Module is active in WCDMA mode. The power consumption depends
on network settings.
HSDPA
HSDPA IDLE
Module is ready for data transmission, but no data is currently sent or
received. Power consumption depends on network settings and
HSDPA configuration
HSDPA
DATA
There is HSDPA data transfer (PPP or TCP or UDP) in progress. In
this case, power consumption is related with network settings (e.g.
power control level), uplink/downlink data rates and HSDPA
configuration
Power down
Module can be powered down by the AT command “AT+CPOF” or the POWER_ON
pin. The power management unit shuts down the power supply of the module, only the
power supply of RTC is remained. The serial interface is not accessible. Operating
voltage (connected to VBAT) remains applied.
Minimum
functionality
mode
The AT command “AT+CFUN” can be used to set the module to a minimum
functionality mode without removing the power supply. In this mode, the RF part of
the module will not work or the SIM card will not be accessible, or both will be closed,
and the serial port is still accessible. The power consumption in this mode is very low.
5.2.2 Minimize Power Consumption
There are two modes that SIM5320AL 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), SIM5320AL will enter sleep mode automatically. In this mode, SIM5320AL
can still receive paging
，
voice call or SMS from network. If USB interface of SIM5320AL is connected to
host CPU, but host CPU does not support USB suspending, then SIM5320AL will not enter sleep mode.
After USB is disconnected, SIM5320AL will enter sleep mode.
Note: When UART interface is connected with host CPU, SIM5320AL 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