Smart Machine Smart Decision
SIM68R_Hardware Design_V1.02
32
2013.01.22
4
Application Interface
4.1
Power Management
4.1.1
Power Input
The power supply range is from 2.8V to 4.3V, and it should be able to provide sufficient current up to 100mA.
4.1.2
Starting SIM68R
z
When power is first applied, SIM68R goes into operation mode.
4.1.3
Verification of SIM68R Start
System activity indication depends upon the chosen serial interface:
z
When it is activated, SIM68R will output messages at the selected UART speed, and message types.
Note: the baud rate information can be found on the label.
4.1.4
Power Saving Modes
SIM68R supports operating modes for reduced average power consumption like sleep mode, backup mode,
periodic mode, and AlwayLocate
TM
mode.
z
Sleep mode
:
In this mode the receiver stays at full on power state. When this mode that can be wake up by
the host sends the command through the communication interface or external interrupt.
z
Backup mode
:
In this mode the SIM68R must be supplied by the backup and it can help to count down the
time for backup mode. Software on host side to send the command through the communication interface
into the backup mode.
z
Periodic mode
:
In this mode the SIM68R enters tracking and backup mode according to the interval
configured by users in the commands.
z
AlwayLocate
TM
mode: AlwayLocate
TM
is an intelligent controller of SIM68R periodic mode. Depending on
the environment and motion conditions, SIM68R can adaptive adjust the on/off time to achieve balance of
positioning accuracy and power consumption.
Note: the modes mentioned above are operated by PMTK commands, users can refer to document [3] for more information.
SIM68R provides very low leakage battery back up memory, which contains all the necessary GNSS information
for quick start up and a small amount of user configuration variables. It needs a 3V power supply for V_BACKUP
pin, and the stable operation region ranges from very light load to about 3mA.