Ethernet path from an outdoor heat pump, through room controllers and presence sensors, up to a cloud-based home automation platform controlling residential heating. The setup shows how single-pair Ethernet and multidrop Power over Ethernet can collapse data and power onto one cable while keeping a standard Ethernet stack from edge devices to the cloud. https://www.microchip.com/en-us/products/high-speed-networking-and-video/ethernet/single-pair-ethernet/10base-t1s
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Microchip uses this interview to walk through its 10BASE-T1S MPoE sustainability demo: a complete At SPS 2025 in Nuremberg, the team models a small house with two floors and a basement plus an external heat pump, all interconnected over 10BASE-T1S. Presence detectors in each room decide whether the heating system should run, and the logic is orchestrated in the cloud so that heat is only delivered when occupants are detected. 10BASE-T1S itself is a 10 Mb/s Single Pair Ethernet physical layer defined in IEEE 802.3cg, using a single balanced pair in a multidrop bus topology to connect several nodes over short distances while staying within a unified Ethernet architecture.
A key aspect of the demo is MPoE (Multidrop Power over Ethernet) based on the emerging IEEE 802.3da specification, which delivers both data and up to around 100 W of power over the same single-pair cable to all the nodes on the segment. This is particularly relevant for retrofits and constrained installation spaces, where pulling separate power lines for room controllers and sensors is expensive or impractical. By using Single Pair Ethernet with power over data lines, the wiring harness becomes simpler, lighter and easier to scale as more sensors and actuators are added across the building.
All intelligence in the demo is concentrated in a central application node; the remote 10BASE-T1S devices are purely controlled over Ethernet and do not embed their own microcontrollers or application firmware. This architecture, supported by Microchip’s LAN865x MAC-PHY and LAN867x PHY families, keeps software development, regression testing and maintenance in one place while the field devices remain simple Ethernet endpoints. ([microchip.com][1]) The result is a cleaner path from prototyping to deployment for OEMs who want to build cloud-connected, occupancy-aware heating systems and other building or industrial automation use cases on top of a standard, edge-to-cloud Ethernet stack.
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