Navigation device (receiver)
NAVIA
GNSS - KL 3333
Operation manual 2.0
17
Energy-saving modes
The most important feature of navigation modules assembled on the base of chipset of
Mediatek
MT3333 is their cost-effectiveness of power consumption.
So, at the end of 2014
MT3333 chipset
remains the most economical and flexible in terms of power consumption of all
commercially produced chipsets.
Accordingly, the modules are based on this chipset are leaders
in energy-efficiency.
Further in the text
<*CS>
means the message checksum prefixed
*.
This is followed by
symbols
<CR><LF>,
command completion.
In the examples, the fragment
<*CS>
not indicated to improve readability.
Standby Mode
Standby Mode
Standby Mode
Standby Mode
Power saving mode with current consumption not exceeding 350 uA. The receiver enters the
mode by the command and leaves the mode by the reception of any byte.
$ PMTK161, 0 <* CS>
Entry Standby mode command:
$ PMTK161,0
The answer to the command:
$ PMTK001,161,3
Standby exit command:
Any byte
Backup Mode
Backup Mode
Backup Mode
Backup Mode
Power saving mode with current consumption not exceeding 25 uA.
The receiver enters the
mode by the command and leaves the mode after a specified time.
$ PMTK 291, 7, 0, RTCWakeup, 1<*CS>
The maximum
RTCWakeup
is
518,400,000 milliseconds (6 days)
Entry Backup mode command:
$ PMTK291,7,0,10000,1
The answer to the command:
$ PMTK001,291,3
Backup
exit command:
Not required. Output through 10000 ms (10 s).
P
P
P
Periodic
eriodic
eriodic
eriodic
activate
activate
activate
activate m
m
m
mode
ode
ode
ode (Periodic)
(Periodic)
(Periodic)
(Periodic)
Power-saving mode with a current consumption not exceeding 350 uA or 25 uA (depending
on settings).
This mode is expanded from Standby and Backup modes to auto repeat cycles mode.
PMTK223, SV, SNR, Extension Threshold, Extension Gap
SV
= 1. The number of satellites for updating the ephemeris (1 ... 4)
SNR
= 30. Value
signal - noise ratio for the start of the update ephemeris (25 ... 30)
Extension threshold
= 180000 msec. Extension of operation time to update the
ephemeris (40000…180000)
Extension
gap
= 60,000 msec. The time between two consecutive renewals ephemeris
(0 ... 3600000)
PMTK225, Type, Run Time, Sleep Time, Second Run Time, Second Sleep Time
Type
= 1 (1 for «periodic backup»; 2 for
«periodic standby»)