Smart Machine Smart Decision
SIM868_Series_Hardware_Design_V1.06
14
2017-07-13
Power consumption
With GPS and BD
(4)
Acquisition
31.2
mA
Continuous tracking
25.8
mA
GLP current
12
mA
Sleep current
6.5
mA
Stop current
490
uA
Backup current
8
uA
(1) 50% 24hr static, -130dBm
(2) 50% at 30m/s
(3) GPS signal level: -130dBm
(4) Single Power supply 3V@-130dBm
2.2.
Operating Modes
Table 4 summarizes the various operating modes of GSM:
Table 4: Overview of GSM operating modes
Mode
Function
Normal
operation
GSM/GPRS
SLEEP
Module will automatically go into sleep mode if the conditions of sleep
mode are enabling and there aren’t on air and hardware interrupt (such as
GPIO interrupt or data on serial port).
In this case, the current consumption of module will reduce to the minimal
level.
In sleep mode, the module can still receive paging message and SMS.
GSM IDLE
Software is active. Module is registered to the GSM network and ready to
communicate.
GSM TALK
Connection between two subscribers is in progress. In this case, the power
consumption depends on network settings such as DTX off/on,
FR/EFR/HR, hopping sequences and antenna.
GPRS
STANDBY
Module is ready for GPRS data transfer, but no data is currently sent or
received. In this case, power consumption depends on network settings and
GPRS configuration.
GPRS DATA
There is GPRS 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 GPRS configuration (e.g. used
multi-slot settings).
Power off
Normal power off by sending AT command “AT+CPOWD=1” or using the PWRKEY. The
power management unit shuts down the power supply for the baseband part of the module.
Software is not active. The serial port is not accessible. Power supply (connected to 3V)
remains applied.
Minimum
functionality
mode
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 RF part and SIM card will be closed, and the
serial port is still accessible. The power consumption in this mode is lower than normal
mode.
SIMCOM
CONFIDENTIAL
FILE
