Specifications
L70 Hardware Design
L70_HD_V1.0 - 16 -
3.3. Operating modes
The table below briefly summarizes the various operating modes of L70 module.
Table 6: Overview of operating modes
Mode
Function
Acquisition mode
The module starts to search satellite, determine visible satellites and
coarse carrier frequency and code phase of satellite signals. When the
acquisition is completed, it switches to tracking mode automatically.
Tracking mode
The module refines acquisition’s message, as well as keeps tracking
and demodulating the navigation data from the specific satellites.
Power
saving
mode
Standby mode
Using EXTINT0 pin or PMTK command can make the module enter
the standby mode. In this mode, the UART port is still accessible, but
has no NEMA messages output, the current consumption of the
module is also minimal.
Backup mode
When cutting off the main power supply, the module will enter the
backup mode. In this mode, the RTC (Real Time Clock) power
supply is needed. It can supply power for backed-up memory which
contains all the necessary GPS information for quick start-up and a
small amount of user configuration variables.
Periodic standby
mode
Periodic standby mode is a periodic mode that can control the on/off
time of L70 module periodically to reduce power consumption. It
supports the module to switch automatically between normal mode
and standby mode.
AlwaysLocate
TM
standby mode
AlwaysLocate
TM
is an intelligent controller of L70 periodic mode.
AlwaysLocate
TM
standby mode supports the module to switch
automatically between normal mode and standby mode. According to
the environmental and motion conditions, the module can adaptively
adjust the on/off time to achieve the balance between positioning
accuracy and power consumption.
3.4. Power supply
The main power supply is fed through the VCC pin. It is important that the system power supply
circuitry is able to support the peak power. So the power supply must be able to provide sufficient
current up to 150mA.
The power supply of RTC circuit is fed through the V_BCKP pin. For more details, please refer to
chapter 3.6.2.
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