User's Manual

GSM/GPRS/GNSS Module Series
MC60 Hardware Design
MC60_Hardware_Design Confidential / Released 37 / 99
Easy Technology Enable
EASY will be disabled automatically when update
rate exceeds 1Hz.
GNSS GPS+GLONASS
In full on mode, the consumption complies with the following regulations:
When the GNSS part is powered on, the average current will rush to 40mA and last for a few seconds;
then the consumption will be decreased to the acquisition current marked in table 3 and we defined this
state as acquisition state, and also it will last for several minutes until it switches to tracking state
automatically. The consumption in tracking state is less than that in acquisition state. The value is also
listed in table 3.
Sending PMTK commands allows for switching among multiple positioning systems:
 $PMTK353,0,1*36: search GLONASS satellites only
 $PMTK353,1,0*36: search GPS satellites only
 $PMTK353,1,1*37: search GLONASS and GPS satellites
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 or exit from 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 500uA @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.
In all-in-one solution, make sure the GNSS part is powered on before sending these PMTK commands.
NOTE