When power is first applied, the module will start up in full power continuous operation
mode. During operation, the current drawn by the module can vary greatly, especially if
enabling low-power operation modes. The supply must be able to handle the current
fluctuation including any inrush surge current.
GPS/GNSS receiver modules require a clean and stable power supply. In designing such
a supply, any resistance in the Vcc line can negatively influence performance. Consider
the following points: All supplies should be within the rated requirements. At the module
input, use low ESR capacitors that can deliver the required current for switching from
backup mode to normal operation. Keep the rail short and away from any noisy data lines
or switching supplies, etc. Wide power lines and power planes are preferred.
9.2.2. VBATT
The battery backup power input range is specified in the table below.
Vbatt supplies power to the following elements (the RTC domain):
• Real-time clock (RTC)
• Battery backed RAM (BBRAM)
• EASY data
• Persistent data elements (not commanded option values).
This allows the module to retain time and ephemeris information, thus enabling hot and
warm starts, which will improve TTFF.
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