SE868-V3 Product User Guide
1VV0301205 r4 – 2016-01-20
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
Page 24 of 76
Mod. 0805 2015-02 Rev.4
4.17.2.2.
SmartGNSS II
SmartGNSS II includes the benefits of SmartGNSS I and achieves further power reduction by
minimizing the usage of the secondary GNSS constellation. The adaptive mechanism adjusts
constellation usage based on signal conditions to maintain performance while minimizing
power consumption. 1PPS is available.
4.17.3.
Trickle Power
This mode cycles between FULL POWER and STANDBY states. It provides GPS-only
navigation updates based on a duty cycle which can be set from 100 ms to 900 ms ON time.
The system runs in full power until it learns ephemeris and RTC calibration, then switches to
the specified duty cycle periods. If signals are weak or the fix is lost, the receiver will go to the
FULL POWER state. TricklePower mode yields significant power savings in strong signal
conditions. 1PPS is not available.
4.17.4.
Push-to-Fix
This mode provides for even lower power consumption than TricklePower and is intended for
applications that require relatively infrequent position reports. The position is reported
periodically (once every 6, 12, 18, 24 seconds or 30 to 86400 seconds in 30 s increments) and
also when requested by toggling the On-Off pin.
Push-to-FixII allows vehicle velocity to be taken into account for PTF period, and also allows
QoS checks to be enabled or disabled.
4.17.5.
SiRFaware
This is a power-saving mode that maintains GPS data by waking up at intervals (e.g. every 30
minutes) to collect signals. Time/and position estimates are updated (e.g. every 10 minutes).
Extended Ephemeris will be used if available.
4.17.6.
Hibernate
The receiver can be commanded into the HIBERNATE state, which is the lowest power mode
available. Only the RTC and BBRAM domains are powered up. Use the NMEA $PSRF117,16
or OSP MID 205 command to transition to this state. The module will also transition to
HIBERNATE when the ON-OFF pin is brought low.
