Power Supply - Advanced Navigation Spatial OEM Reference Manual

Spatial OEM Reference Manual
Page 28 of 88
Version 2.7
A
Illustration 22: Recommended footprint for Spatial OEM
PCB footprint files are provided in the documentation section of the website. Please contact
Advanced Navigation support if you have any issues or to verify your footprint is correct.
5.5

Power Supply

A high level of power supply filtering has been built into Spatial, however it is still recommended
that the power supply be free of significant noise. As the communications ground is shared with the
supply ground it is important to ensure that ground wiring is routed to avoid power supply noise
from other systems corrupting data communications.
A power supply should be selected that can provide at least the maximum current calculated from
the graph in Illustration 14.
Spatial contains an active protection circuit on the power supply input that protects the unit from
under-voltage, over-voltage and reverse polarity events. The protection circuit shuts off power and
automatically recovers the unit to full operation once the fault is removed. Take care when running
the unit close to its under-voltage lockout of 4.2 V because small voltage drops can engage the
under-voltage shutdown and potentially oscillate between the on and off state. It is recommended
that the unit is always run at 4.7 V or more to avoid issues associated with this.
On start-up of the Spatial OEM the device will initially draw an increased impulse current (~400mA
for 2 microseconds) whilst it charges on board capacitors. It is important that the user's circuit is
tolerant to these small impulses on start-up to avoid unsuccessful power up. It is recommended