SAM-M10Q-Integration manual
• If the receiver is able to acquire weak signals but not of the quality needed to get a fix, it will
transition to the "Inactive for search" state after the timeout configured in MAXACQTIME or
earlier if too few signals are acquired.
• If the receiver is unable to acquire any signals or it acquires a small number of extremely bad
signals (e.g., no sky view), it will transition to the "Inactive for search" state after the timeout
configured in MAXACQTIME.
User-configurable mechanisms:
• MINACQTIME is the minimum time that the receiver will spend in the "Acquisition" state
• MAXACQTIME is the maximum time that the receiver will spend in the "Acquisition" state.
• DONOTENTEROFF forces the receiver to stay awake and in the "Acquisition" state even when a
fix is not possible.
External mechanisms:
• The receiver is forced to stay awake if EXTINTWAKE is enabled and the EXTINT pin is set to
"high". The receiver is forced to stay in the "Inactive for search/Fix" states if EXTINTBACKUP is
enabled and the EXTINT pin is set to "low".
• The receiver is forced to stay awake if EXTINTINACTIVE is enabled and the EXTINT pin is
toggled. If EXTINT pin state is not changed for a longer time than EXTINTINACTIVITY, the
receiver enters the "Inactive for search/Fix" states.
2.6.2.3 Cyclic tracking
Power save mode cyclic tracking (PSMCT) operation is described in Figure 11.
PSMCT supports 1 Hz and 2 Hz navigation update rates. In addition, longer update periods
from 2 s to 10 s are supported at 1 s steps.
Figure 11: Cyclic tracking operation
• When the receiver is switched on, it first enters the "Acquisition" state. A non-zero value for
MINACQTIME increases the acquisition period and allows the receiver to acquire more satellites
at startup. A larger number of signals tracked later helps the receiver to remain in the "POT"
state if some signals get blocked and are lost. This may reduce the overall power consumption.
• If it is able to acquire a valid position fix (one passing the navigation output filters) within the
time given by the Acquisition timeout, it switches to the "Tracking" state and the ONTIME
starts. Otherwise it enters the "Inactive for search" state and restarts after the configured
search period (minus a start-up margin).
• Once the ONTIME is over, the "POT" state is entered. Setting the ONTIME to zero causes the
receiver to enter the "POT" state as soon as possible.
• In the "POT" state the receiver continues to output position fixes according to the CFG-RATE-*.
• If the signal becomes weak or is lost during the "POT" state, the "Tracking" state is entered.
• Once the signal is good again and the newly started ONTIME is over, the receiver will re-enter
the "POT" state.
UBX-22020019 - R01
2 Receiver functionality Page 27 of 72
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