GT-1612-MTBD
GPS&Beidou Receiver Module
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Page 8 of 35
Revision: V2.0.1-January 2015
The VBAT pin supplies power for RTC domain. It should be valid when power on the module. The voltage of
RTC domain ranges from 1.5V to 4.3V. In order to achieve a better TTFF, RTC domain should be valid all the time. It
can supply power for SRAM memory in RTC domain which contains all the necessary GPS&Beidou information for
quick start-up and a small amount of user configuration variables.
The module's internal power construction is shown as below.
VCC supplies power for PMU, and VBAT supplies power for RTC domain. TIMER signal highlighted in red in
the following figure belongs to RTC domain and can be used to control the power switch on/off.
Figure 3:
Internal Power Construction
Power supply solutions for GT-1612-MTBD module are listed as the following.
The simplest power circuit for GT-1612-MTBD module is 3.3V power source connected to VCC pin and VBAT
pin of the module directly. In this case, once you powered on the module, the full cold start will be implemented.
Figure 4:
Reference Circuit for Power Supply
