SE868Kx-Ax Family Product User Guide
1VV0301201 Rev. 5
Page 45 of 83
2021-07-15
Not Subject to NDA
DC Power Supply
The modules have two power supply pins V
CC
and V
BATT
.
Warning: Note that I/O voltage ranges are different from supply
voltages VCC and VBATT.
9.4.1.
VCC
This is the main power input. The supply voltage must be in the range specified in Table
23:DC Supply Voltage below.
Warning: Vcc does not supply the RTC domain, therefore Vbatt must
be supplied any time that Vcc is powered. This may be accomplished
by tying Vbatt to Vcc.
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.
9.4.2.
VBATT
Warning: Battery backup power input (as specified in the table below)
must be supplied any time that Vcc is powered up. This may be
accomplished by tying Vbatt to Vcc.
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).
