GT-1612-MTBD
GPS&Beidou Receiver Module
www.gotop-zzu.com
Page 11 of 35
Revision: V2.0.1-January 2015
Table 4: Default Configurations
2.4.2. 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 module stops satellites search and navigation. UART is still
accessible through PMTK commands or any other data, but there is no NMEA messages output.
Sending PMTK command “$PMTK161,0*28” will make GT-1612-MTBD module enter into standby mode.
Sending any data via UART can wake the module up. When the module exits from standby mode, it will use all
internal aiding information like GPS&Beidou time, Ephemeris, Last Position, etc., resulting to the fastest possible
TTFF in either Hot or Warm start. The typical standby current consumption in this way is about 1mA @VCC=3.3V.
When the external active antenna is used, an additional 11mA will be consumed because the VCC still supplies
power for external active antenna in standby mode.
2.4.3. Backup Mode
Backup mode consumes lower power than standby mode. In this mode, only the backup supply VBAT is powered
on while the main supply VCC is switched off by host or the TIMER signal of GT-1612-MTBD. In order to enter into
backup mode autonomously via the TIMER pin, an external switch circuit is necessary. The following figure has
shown a typical reference design about the switch circuit for TIMER.
ltem
Configuration
Comment
Baud Rate
9600bps
Can be configured as 4800bps~115200bps
Protocol
NMEA
RMC, VTG, GGA, GSA, GSV, GLL and
GPTXT
（
MTK proprietary protocol
）
Update Rate
1Hz
Can be configured as 1~10Hz
SBAS
Enable
AIC
Enable
LOCUS
Disable
EASY
Enable
EASY will be disabled automatically when update rate
exceeds 1Hz.
