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SIM868_Series_Hardware_Design_V1.06 15 2017-07-13
Table 5: Overview of GNSS operating modes
Note: X means no matter GPS_VBAT is existed or not.
2.3. Functional Diagram
Figure 1 shows the block diagram of SIM868:
GSM baseband
PMU
The GSM Radio Frequency part
Antenna interface
GNSS interface
Other interface
Figure 1: SIM868 block diagram
Mode GPS_VBAT GNSS_EN VRTC Main clock RTC clock
Full on on H on on on
Stop on H on off on
Backup X L on off on
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