The next generation of building controllers opens up a new intelligent experience

ADIN2111 is a low power, low complexity, dual Ethernet port switch. It integrates a 10BASE-T1L PHY and a Serial Peripheral Interface (SPI) port, uses a low-power constrained node, targets industrial Ethernet applications and is compliant with the IEEE® 802.3cg-2019™ Ethernet standard for long distance 10 Mbps Single Pair Ethernet (SPE).

Figure 5: ADIN2111

The switch (pass-through or store-and-forward) supports multiple cabling configurations between the two Ethernet ports and the SPI host port, providing a flexible solution for line, daisy chain, or ring network topologies. Additionally, it is available in an unmanaged configuration, where the device automatically forwards traffic between two Ethernet ports.

The ADIN2111 supports cable reach up to 1700 meters and features ultra-low power consumption of 77 mW. The two PHY cores support 1.0 V pp operation and 2.4 V pp operation as defined in the IEEE 802.3cg standard, and can be powered from a single 1.8 V or 3.3 V supply rail.

The device integrates the switch, two Ethernet physical layer (PHY) cores with media access control (MAC) interfaces, and all associated analog circuitry, input and output clock buffer devices. The device also includes internal buffer queues, SPI and subsystem registers, and control logic to manage reset and clock control and hardware pin configuration.

The ADIN2111 integrates voltage supply monitoring circuitry and power-on reset (POR) circuitry to improve system-level robustness. The 4-wire SPI used to communicate with the host can be configured as OPEN Alliance SPI or general purpose SPI. Both modes support optional data protection or cyclic redundancy check (CRC).

Ethernet powered solution

SPoE (Single Pair Power over Ethernet) was also called "Power over Data Line (PoDL)" before, and the corresponding equipment is made with the 10base-T1L mentioned earlier. For example, customers need self-power supply after using the two-wire 10base-T1L Ethernet technology. After adding this function, the end node can transmit signals and supply power on a twisted pair, so the panel can be made very fiber-optic. Thin. Self-powered end nodes can proactively report some status information or alarm information regularly and regularly, instead of only passively accepting access from the master station.

In this regard, Shijian recommends a single-pair Ethernet powered device (PD) controller that complies with the IEEE 802.3cg standard - ADI's LTC9111. The wide operating range of 2.3V-60V combined with polarity correction makes this The controller is particularly suitable for classification-based systems in building and factory automation applications.

Figure 6: LTC9111 block diagram

SCCP-based classification ensures that Power Supply Equipment (PSE) only provides full operating voltage when a valid PD is connected. The LTC9111 utilizes micropower operation during classification to minimize storage capacitor requirements and drives two external N-channel MOSFET switches that isolate the output capacitance from the connector during classification and during surges.

The voltage monitor enables the external MOSFET when the PD input voltage exceeds the configured class's ON voltage threshold or after a forced delay. The EN output asserts after the controlled GATE pin ramps up, which also disables the MOSFET when the input voltage drops below the configured class's shutdown voltage threshold. The LTC9111 utilizes a low startup voltage of 1.6V to drive a pair of external low-side N-channel MOSFETs for polarity correction, which reduces power loss.

【Summarize】

In summary, Excelpoint believes that ADI’s innovative technologies and system expertise are helping to shape the future of the smart building industry, and its products and solutions can provide configurable, simplified and high-performance development trends for smart building control systems. At the same time, it also provides a foundation for future technological innovation in the market and can help the market better meet various challenges.