Supply Filter#

A good power supply filter is strongly recommended as part of the schematic. A filter with a ferrite and a capacitor can be used as shown in the figure below. The ferrite suppresses high frequency noise, while the capacitors decouple the power supply by acting as a source for fast transient currents.

For Z-Wave 800 devices, the filter shown in the figure below is strongly recommended. For normal scenarios, this will provide adequate filtering with a low BOM cost. In case of excessive supply noise, the 0 resistor can be swapped for a ferrite bead to improve filtering.

For more information about supply decoupling, refer to Decoupling. Refer to [8] and [9] for more in-depth information about decoupling strategies and the power supply systems of Z-Wave devices.