User's Manual

Smart Machine Smart Decision
SIM868_Hardware_Design_V1.00 13 2016-06-20
NMEA
Power consumption
With GPS only
mode
(4)
Acquisition 23.4 mA
Continuous tracking 22.6 mA
Sleep current 650 uA
Power consumption
With GLONASS only
mode
(4)
Acquisition 24 mA
Continuous tracking 21 mA
Sleep current 650 uA
Power consumption
With GPS and
GLONASS
(4)
Acquisition 31 mA
Continuous tracking 26 mA
Sleep current 650 uA
(1) 50% 24hr static, -130dBm
(2) 50% at 30m/s
(3) GPS signal level: -130dBm
(4) Single Power supply 3.8V@-130dBm,GSM IDLE
Table 4: Coding schemes and maximum net data rates over air interface
Coding scheme 1 timeslot 2 timeslot 4 timeslot
CS-1 9.05kbps 18.1kbps 36.2kbps
CS-2 13.4kbps 26.8kbps 53.6kbps
CS-3 15.6kbps 31.2kbps 62.4kbps
CS-4 21.4kbps 42.8kbps 85.6kbps
2.3. Operating Mode
The table below summarizes the various operating modes of SIM868.
Table 5: Overview of 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 the
module is 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, 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,