The receiver switches to the tracking engine to lower the power consumption when:
• A valid GPS/GNSS position is obtained.
• The ephemeris for each satellite in view is valid.
To return to Full Power mode from a low power mode, send a $PMTK225,0*2B
command just after the module wakes up from its previous sleep cycle.
If power is removed from both Vcc and Vbatt, then Time, Ephemeris, Almanac, EASY, EPO
data, and PMTK configuration data will be lost. If Vbatt is present, no data will be lost.
4.12.2. Standby Modes
In these modes the receiver stops navigation, the internal processor enters the standby
state, and the current drain at main supply VCC_IN is substantially reduced.
STOP: ARM baseband, RF, and TCXO are powered down
SLEEP: ARM baseband and RF are powered down
To enter a Standby mode, send the following command:
$PMTK161,0*28 (STOP Mode)
$PMTK161,1*29 (SLEEP Mode)
To exit a Standby mode, send any byte to the host port (RX).
4.12.3. GLP Mode (SL869-V2 and SL869L-V2 only)
In the GNSS Low Power (GLP) mode, power consumption is reduced for some time during
a one second period. The module will alternate this cycling with periods of full power
when necessary, for example weak signals or decoding the navigation message.
A typical current draw is 10 to 14 mA, depending on conditions.
Note that position accuracy will be reduced during GLP operation, therefore the user
must determine the tradeoff between power consumption and desired accuracy.
A timeline is shown below:
Figure 13: GNSS Low Power (GLP) Mode Diagram
To Next Page
Loading...
Need help?
General