LEA-6 / NEO-6 - Hardware Integration Manual
GPS.G6-HW-09007-A
Preliminary
Hardware description
Page 10 of 62
VCC
V_BCKP
Voltage
Supervisor
Module Voltage Supply
RTC and Battery Backup RAM (BBR)
J1
Figure 3: Backup Battery and Voltage
1.3.1.3
VDD_USB - USB interface power supply
VDD_USB
supplies the USB interface. If the USB interface is not used, the
VDD_USB
pin must be connected to
GND. For more information regarding the correct handling of
VDD_USB
see section 1.6.2.1
1.3.2
Operating modes
u-blox 6 modules with FW 6.02 or ROM6.02 have two continuous operating modes (Maximum Performance and
Eco) and one intermittent operating mode (Power Save mode). Maximum Performance mode freely uses the
acquisition engine, resulting in the best possible TTFF, while Eco mode optimizes the use of the acquisition
engine to deliver lower current consumption. At medium to strong signals, there is almost no difference for
acquisition and tracking performance in these modes.
1.3.2.1
Maximum Performance mode
In Maximum Performance mode, u-blox 6 receivers use the acquisition engine at full performance to search for
all possible satellites until the Almanac is completely downloaded.
As a consequence, tracking current consumption level will be achieved when:
•
A valid GPS position is fixed
•
Almanac is entirely downloaded
•
Ephemeris for all satellites in view are valid
1.3.2.2
Eco mode
In Eco mode, u-blox 6 receivers use the acquisition engine to search for new satellites
only when needed
for
navigation:
•
In cold starts, u-blox 6 searches for enough satellites to navigate and optimizes use of the acquisition
engine to download their ephemeris.
•
In non-cold starts, u-blox 6 focuses on searching for visible satellites whose orbits are known from the
Almanac.
In Eco mode, the u-blox 6 acquisition engine limits use of its searching resources to minimize power
consumption. As a consequence the time to find some satellites at weakest signal level might be slightly
increased in comparison to the Maximum Performance mode.
u-blox 6 deactivates the acquisition engine as soon as a position is fixed and a sufficient number (at least 4) of
satellites are being tracked. The tracking engine continues to search and track new satellites without orbit
information.
1.3.2.3
Power Save mode
LEA-6 and NEO-6 modules include power saving options that allow reducing the average tracking current
consumption by switching off parts of or the complete GPS receiver and waking it up at configurable intervals
from one second to one week. This can be done by using a hardware interrupt or by sending a serial command.
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