Smart Machine Smart Decision
SIM868_Series_Hardware_Design_V1.06
53
2017-07-13
$PMTK353,0,1,0,0,0*2A (GLONASS only)
$PMTK353,1,1,0,0,0*2B (GPS+GLONASS)
$PMTK353,1,0,0,0,1*2B (GPS+BEIDOU)
Customer can refer to document [13] for more information.
Stop mode: Stop mode means a low quiescent (590uA typ) power state and a PMTK command can be used
to enter. Any character input will exit from stop mode.
Note: Using the PMTK161 command to enter stop mode: "$PMTK161,0*28"
Customer can refer to document [13] for more information.
Backup mode: In this mode, the power source (such as battery) is connected to VRTC pin, which will help
to keep its internal RTC running when the GPS_VBAT is turned off. The VRTC power must be kept active
all the time, the GNSS module will perform a quick start every power-on.
Backup mode has lower power consumption than stop mode. The power consumption in this mode is about
8uA.
Periodic mode
:
In this mode, periodic control power on/off of GPS to reduce power consumption.
"$PMTK225,(Type),(Run time),(Sleep time),(Second run time),(Second sleep time)*15"
Note: Using the PMTK225 command to set periodic mode:
Periodic backup mode:
"$PMTK225,0*2B"
"$PMTK223,1,25,180000,60000*38"
"$PMTK225,1,3000,12000,18000,72000*15"
Periodic stop mode:
"$PMTK225,0*2B"
"$PMTK223,1,25,180000,60000*38"
"$PMTK225,2,3000,12000,18000,72000*15"
Customer can refer to document [13] for more information.
AlwaysLocate
TM
mode: AlwaysLocate
TM
is an intelligent controller of GNSS periodic mode. Depending on
the environment and motion conditions, GNSS can adaptive adjust the on/off time to achieve balance of
positioning accuracy and power consumption.
Note: Using the PMTK225 command to set AlwaysLocateTM mode.
AlwaysLocateTM Stop mode:
"$PMTK225,0"
"$PMTK225,8"
AlwaysLocateTM Backup mode:
"$PMTK225,0"
"$PMTK225,9"
Customer can refer to document [13] for more information.
GLP mode
:
The power consumption is lower in GLP (GNSS low power) mode. GNSS can be waked up
when the host sends the command through the communication interface.
GLP mode is to achieve 1Hz NMEA output and power saving, switch the Measurement Engine (DSP) and
SIMCOM
CONFIDENTIAL
FILE
