Gnssgetconsumption; Gnss Almanac; Table 11-14: Gnssgetconsumption Command; Table 11-15: Gnssgetconsumption Response - Semtech LR1110 User Manual

11.4.6 GnssGetConsumption

The command GnssGetConsumption( ) allows to read out the duration of the Radio capture and the CPU processing phases
of the GNSS Scanning capture. These timings are expressed in microseconds.
This can be used in order to determine the GNSS Scanning power consumption.

Table 11-14: GnssGetConsumption Command

Byte
Data from Host
Data to Host

Table 11-15: GnssGetConsumption Response

Byte 0
Data from
0x00
Host
Data to
Stat1
Host

11.5 GNSS Almanac

The GNSS Almanac consist in information about the state of the entire GNSS satellite constellation and coarse data on every
satellite's orbit. There is a specific almanac for each constellation. The almanac data is valid for up to 90 days.
The use of the almanac allow to significantly optimize the GNSS scanning duration: it allows the LR1110 to search only for
visible satellites given the user location and time, and therefore allows to reduce the energy required for a GNSS scanning.
The Alamanac is used by the LR1110 in the GNSS assisted mode.
The LR1110 is pre-programmed with the latest Almanac data at the date of the production test. Even if the Almanac data is
valid for 90 days, it is advised to use the latest Almanac data for power optimization. The up-to-date almanac is Available
from the Device Management Center (DMC) server.
The whole Almanac data can be updated (full update). The Almanac is entirely stored in the flash memory, therefore kept
after power off or Sleep mode without retention.
LR1110
User Manual Rev.1.0
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0
0x04
Stat1
1 2
0x00 0x00 0x00
CPU CPU CPU
Time Time Time
(31:24) (23:16) (15:8)
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3 4 5
0x00 0x00
CPU Radio
Time Time
(7:0) (31:24)
1
0x19
Stat2
6 7
0x00 0x00 0x00
Radio Radio Radio
Time Time Time
(23:16) (15:8) (7:0)
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