POE devices boost IoT - Embedded.com

POE devices boost IoT


Silicon Labs showed off their two new Power over Ethernet (PoE) Powered Device (PD) families, Si3406x and Si3404.  These devices are designed with high integration and efficiency to serve a broad range of Internet of Things (IoT) applications. These families have all necessary high-voltage discrete components on a single PD chip; the solutions support IEEE 802.3 at PoE+ power capabilities, have flexible power conversion options with more than 90 % efficiency, sleep/wake/LED support modes and excellent EMI immunity. More power is needed for the next generation of designs with the IoT in mind.

Figure 1 IP Cameras, Wireless Access Points, IP Phones and Smart Lighting use PoE (Image courtesy of Silicon Labs)

Cameras, in security and surveillance, are growing more than 20% Year-on-Year; Wireless Access Point at 15% Year-on-Year (feature-rich video IP Phones, public hot spots, advanced 802.11 wireless access points, and smart home appliances). Design engineers like more integrated solutions of such devices with good power conversion efficiency and Silicon Labs excels in those areas. Legacy products have high voltage on chip like transient voltage suppressors, input diode bridges, and power MOSFETs enabling direct connection to an Ethernet RJ-45 connector. Along with this, the company has raised their power conversion efficiency from a legacy 70% to 90% with these new ICs which also support isolation.

These applications require higher wattage driving increased demand for PD devices that support the PoE+ standard. For example, the latest motor-positioned IP cameras with pan/tilt/zoom and heater elements create heavy loads on power supplies. PoE+ technology brings 30 watts of power to support these demanding application tasks. Surge resiliency up to 4kV is key especially in the China market the cameras are deployed externally with Ethernet cables running inside the building to the outside exposed to potential lightning strikes. See Figure 2 for an IP camera Power system example.

Figure 2 A complete IP camera power reference design system using Si3406x PD device (Image courtesy of Silicon Labs)

Silicon Labs’ Si3406x family is the ideal PD interface solution for new classes of PoE+-enabled IoT products in residential, commercial and industrial environments.

Figure 3 This portfolio addresses all PoE+ PD use cases (Image courtesy of Silicon Labs)

Samples and production quantities of the Si3406x ICs are available now in low-profile, 5 mm x 5 mm QFN packages, and the Si3404 device is available now in a low-profile, 4 mm x 4 mm QFN package. Si3406x product pricing in 10,000-unit quantities begins at $1.34 (USD), and the Si3404 is priced at $1.02 (USD) in 10,000-unit quantities. To help developers reduce development time and cost, Silicon Labs offers a range of isolated and non-isolated Class 2-4 evaluation kits for Si3406x and Si3404 devices with prices starting at $79 (USD MSRP). For more information about the Si3406x and Si3404 families and evaluation kits and to order product samples, visit here.

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