SC872-A
Product User Guide
Product Features
1VV0301202 Rev. 6
Page 19 of 53
2018-12-21
Power Management Modes
The receiver supports operating modes that reduce overall current consumption with less
frequent position fixes. Availability of GNSS signals in the operating environment will be a factor
in choosing power management modes. The designer can choose a mode that provides the
best trade-off of navigation performance versus power consumption.
The various power management modes can be enabled by sending the desired command using
the host serial port (RX).
Table 4-1 Power Management - Command summary
Full Power Continuous Mode
The module starts in full power continuous mode when powered up. This mode uses the
acquisition engine to search for all possible satellites at full performance, resulting in the highest
sensitivity and the shortest possible TTFF.
The receiver then 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.
