Single pair Ethernet PHY for multidrop industrial networks

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By Nick Flaherty

Microchip Technology has developed a family of Ethernet physical interfaces (PHY) for the new multidrop single pair networking standard.

The LAN867x family of 10BASE-T1S PHYs expands Ethernet connectivity to the edge of industrial networks with a multidrop architecture and 25m connection length. This is different from the 10BaseT1L long reach version.

10BaseT1S eliminates the need for gateways that in the past were needed to interconnect incompatible communication systems. The single pair of wires reduces cost, while the multidrop bus architecture reduces the need for switches and gateways. Several nodes can operate on the same bus line with high data throughput and use of the same protocol independent from physical layer speed, all with established security infrastructures and ecosystems.

Microchip’s LAN8670, LAN8671 and LAN8672 Ethernet PHYs are designed and validated to the 10BASE-T1S for industrial applications such as process controls, building automation and consolidation of systems with multiple interconnection technologies. The configuration enables a multidrop (bus line) topology, fewer cables, development on printed circuit boards, with up to at least eight nodes and up to at least a 25m range.

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“Microchip’s 10Base-T1S technology provides an advantage for our endpoint-to-cloud integration, connecting products, controls, software and services in a simpler and more cost-effective way,” said Julien Michel, Connected Systems project leader at Schneider Electric. “The technology will help to make the most of our energy and resources, bridging progress and sustainability for all.”

“For industrial system architects and designers, interconnection of many different communication devices and technologies often is difficult and error prone,” said Matthias Kaestner, vice president, Automotive. “Using 10BASE-T1S Ethernet simplifies these interconnections, enhancing interoperability and speed, which is critical in the industrial environment.”

Reference designs, software drivers, system simulator and evaluation boards are available. The LAN8670, LAN8671 and LAN8672 devices are available from Microchip for volume orders in 32-pin, 24-pin and 36-pin Very thin profile Quad Flat Non-Leaded (VQFN) packages.  

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