ZOE-M8 series - Hardware integration manual
UBX-16030136 - R09
Design-in
Page 18 of 34
Production information
Figure 12: Typical schematic for the ZOE-M8Q without a DC/DC converter
2.10
Design-in checklist
2.10.1
General considerations
Check power supply requirements and schematic:
Is the power supply voltage within the specified range? See how to connect power in section 2.1
and section 2.9.
Compare the peak current consumption of ZOE-M8 GNSS SiPs with the specification of your
power supply.
GNSS receivers require a stable power supply. Avoid series resistance in your power supply line
(the line to VCC) to minimize the voltage ripple on VCC.
Backup battery
For achieving a minimal time-to-first-fix (TTFF) after a power down (warm starts, hot starts),
make sure to connect a backup battery to V_BCKP, and use an RTC. If not used, make sure
V_BCKP is connected to neighbor pin G9.
Antenna/ RF input
Make sure the antenna is not placed close to noisy parts of the circuitry and is not facing noisy
parts (such as micro-controller, display).
Make sure your RF front end is chosen according your design, see section 2.5.
☞
For more information on dealing with interference issues, see the GPS Antenna Application Note
[3].
2.10.2
Schematic design-in for ZOE-M8 GNSS SiPs
For a minimal design with the ZOE-M8 GNSS SiPs, the following functions and pins need to be
considered:
Connect the power supply to VCC and V_BCKP.
If you use DC/DC converter on the ZOE-M8Q, ensure the external inductor and capacitor are in
place in between V_DCDC_OUT and V_CORE.
