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9150-0125-01 R-1
The GPS fix settle time refers to the maximum amount of time the GPS module will allow to try to meet the minimum
accuracy requirements before giving up. The fix settle time begins once a fix is obtained or the fix timeout occurs.
9.1.15.4 GPS Accuracy
The GPS accuracy refers to the minimum estimated horizontal accuracy that should be met in order to declare the current fix
position. The GPS fix settle time will wait for this condition to be met or timeout.
9.1.15.5 Geofence Position
The Geofence position is a configuration setting that can store the root of the current geofence. GPS events can notify the
application when the device has transitioned in or out of the geofence, when a gps fix occurs.
The geofence can be set to a circle or square with configurable radius/half-width.
9.1.15.6 Change of Location Detection
The Geofence position is a configuration setting that can store the current position. GPS events can notify the application
when the device has transitioned out of the stored position, when a gps fix occurs. This feature is particularly useful for the
application's tracking module, to be able to offload this calculation to the GPS module.
The change of location detection is based on a circle with configurable radius.
9.1.15.7 Power Settings
The GPS supports cold and hot starts but allows a warm selection for compatibility. The time-to-fix (TTF) can be reduced by
using warm starts but requires additional low-power consumption by the GPS to maintain ephemeris data.
9.1.15.8 NMEA Pass Through
The NMEA sentences captured can be passed to the application or external interfaces via URC messages, if the
corresponding GPS event flag is enabled.
9.1.15.9 Manual Mode
In manual mode, set GPS Position AT commands can be used to set the GPS position reported by the GPS module, as well
as synchronize the RTC clock.
9.1.15.10 RTC Clock
The RTC clock is automatically updated when a GPS fix occurs
9.1.15.11 RTC Module
The RTC module saves and synchronizes the current UTC date time whenever a GPS fix is obtained internally or via external APIs.
9.1.15.12 RTC Stale Time
The RTC time may drift over time, and thus, an adjustable stale time setting will cause the RTC Module to request a GPS fix.
9.1.15.13 Set RTC Time
A set RTC time API is available. Additionally, the RTC will be synchronized to UTC time if the set GPS Position API is used
(see GPS Module Section).
ST150M User Manual
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