Ublox SAM-M10Q, Руководство по интеграции

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SAM-M10Q - Integration manual
• If the receiver cannot get a position fix in the "Tracking" state, it enters the "Acquisition"
state. Should the acquisition fail as well, the "Inactive for search" state is entered. If
DONOTENTEROFF is enabled and no fix is possible, the receiver will remain in the "Acquisition"
state until a fix is possible and it will never enter the "Inactive for search" state.
2.6.2.4 On/Off mode
Power save mode on-off (PSMOO) operation is described in Figure 12 .
PSMOO requires an RTC to maintain time.
Figure 12: On/off mode operation
• When the receiver is switched on, it first enters the "Acquisition" state.
• 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 startup margin).
• Once the ONTIME is over, the "Inactive for update" state is entered and the receiver restarts
according to the configured update grid defined by GRIDOFFSET.
• If the signal is lost while in the "Tracking" state, the "Acquisition" state is entered. If the signal
is not found within the acquisition timeout, the receiver enters the "Inactive for search" state.
Otherwise the receiver will re-enter the "Tracking" state and stay there until the newly started
ONTIME is over.
Entering the off state of the PSMOO operation clears the RAM memory including the
receiver configuration. To maintain the configuration in PSMOO operation, store it on both
RAM and battery-backed RAM (BBR) layers.
2.6.2.5 External control
The operation of power save mode can be controlled externally using the EXTINT pin. This external
control allows the user to decide when to wake up the receiver to obtain a fix and when to force the
receiver into backup mode to save power. Operating the receiver externally through the EXTINT pin
will override internal functions that coincide with that specific operation.
Enabling EXTINTWAKE prevents the receiver from entering Inactive states for as long as the EXTINT
pin is held "high". In PSMOO, the receiver will therefore always be in the "Acquisition" or the "Tracking"
state. In PSMCT, the receiver can in addition be in the "POT" state. When EXTINT is set "low" the
receiver will continue with its configured behavior.
Enabling EXTINTBACKUP forces the receiver to enter Inactive states for as long as the EXTINT pin
is held "low" until the next wakeup event. Any wakeup event can wake up the receiver even if the
EXTINT pin is held "low". In this case, the receiver only wakes up to read the configuration pins and
then re-enters the Inactive state.
UBX-22020019 - R01 2 Receiver functionality Page 28 of 72
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