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Microchip Technology LAN8650 and LAN8651 Industrial Grade Single Pair Ethernet Switches combine a Media Access Controller (MAC) and an Ethernet PHY. This combination enables low-cost microcontrollers, including those without an onboard MAC, to access 10BASE-T1S networks. The common standard Serial Peripheral Interface (SPI) of the LAN8650 and LAN8651 allows interfacing with nearly any microcontroller to transfer Ethernet packets, and LAN8650 and LAN8651 control/status commands are performed over a single serial interface. SPI requires only four pins, enabling a more straightforward hardware interface with fewer pins than MII or RMII.
Ethernet packets are segmented and transferred over the serial interface according to the OPEN Alliance 10BASE-T1x MAC-PHY Serial Interface specification. The serial interface protocol can simultaneously transfer transmit and receive packets between the station controller and the LAN8650 and LAN8651. Packets are typically stored within the Microchip Technology LAN8650 and LAN8651 before being forwarded to either the station microcontroller or the network. Alternatively, packets may be transferred in a cut-through mode for applications needing reduced latency.
The LAN8650 and LAN8651 devices are equipped with Time-Sensitive Networking (TSN) support, which allows for synchronized timing across far-reaching Ethernet networks. This time synchronization is critical for many automotive applications such as Advanced Driving Assistance Systems (ADAS).
The automotive-qualified LAN8650 and LAN8651 are compliant with the AEC-Q100 Grade 1 qualification standard for enhanced robustness in harsh environments, including extended operational temperature range from −40ºC to +125ºC. In addition, the LAN8650 and LAN8651 are functional safety ready and designed for use in ISO 26262 applications.
