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GSM/GPRS/GNSS Module Series
MC20 Hardware Design
MC20_Hardware_Design Confidential / Released 36 / 95
3.4.2.2. Standby Mode
Standby mode is a low-power consumption mode. In standby mode, the internal core and I/O power
domain are still active; but RF and TCXO are powered off, and the GNSS part stops satellites search and
navigation. The way to enter into standby mode is using
PMTK commands.
When the GNSS part exits from standby mode, it will use all internal aiding information like GNSS time,
ephemeris, last position, etc., to ensure the fastest possible TTFF in either Hot or Warm start. The typical
current consumption is about 300uA @GNSS_VCC=3.3V in standby mode.
Sending the following PMTK command can make GNSS part enter into standby mode:
$PMTK161,0*28: make sure the GNSS part is powered on before sending the command in
all-in-one solution.
The following methods will make GNSS part exit from standby mode:
Sending any data via UART will make GNSS part exit from standby mode in all-in-one solution.
Sending any data via GNSS_UART will make GNSS part exit from standby mode in stand-alone
solution.
3.4.2.3. Backup Mode
Backup mode requires lower power consumption than standby mode. In this mode, the GNSS part stops
acquiring and tracking satellites, but the backed-up memory in backup domain which contains all the
necessary GNSS information for quick start-up and a small amount of user configuration variables is alive.
As long as the backup domain is alive, EASY technology is available. The current consumption in this
mode is about 14uA.
The following method will make GNSS part enter into backup mode:
When VBAT is kept powered and the GSM part is powered on, sending AT+QGNSSC=0 will make
GNSS part enter into backup mode from full on mode.
The following method will make GNSS part exit from backup mode:
Sending AT+QGNSSC=1 via UART, the GNSS part will exit from backup mode and enter full on
mode immediately.
In order to enable GNSS part working in backup mode, please make sure the GSM part is powered on.
NOTE