Würth Elektronik RD022 GB-PoE+ Ethernet USB adapter

Würth Elektronik has launched the RD022 reference design GB-PoE+ Ethernet USB adapter. Devices networked via Ethernet usually depend on a separate power supply; however, if these terminal devices get by with low power consumption, then Power over Ethernet (PoE) is an alternative where data transmission and power supply are achieved via a network cable.

Devices with low power consumption, like IP cameras, VoIP phones, WiFi routers, network switches, LED lighting or access systems, are suitable for power supply through the Ethernet line. Würth Elektronik’s RD022 reference design, which can provide up to 25 W of power, shows how this can work while still maintaining EMC compliance. The GB-PoE+ Ethernet USB adapter is based on the reference design of a 1 Gbps Ethernet USB adapter without PoE functionality.

The USB adapter provides three interfaces: a USB Type-C interface (USB 3.1), an RJ45 1 Gbps Ethernet interface with integrated PoE functionality, and a connection for a DC/DC converter with an adjustable output voltage of 6 to 18 V and a maximum output power of 25 W. The board makes it easier for customers to get started with PoE technology. The reference design familiarises users with the technology, signals, interface structure, power-up and PoE detection of a Gigabit PoE interface. It provides the hardware design for Power Sourcing Equipment (PSE) and the Powered Device (PD) and explains the conception and construction of the adapter board: current flow, USB controller and interface, and Ethernet interface, as well as power supply (PoE). Special importance is also placed on the EMC-compliant design.