onsemi NCN26010XMNTXG

The NCN26010 device is an IEEE 802.3cg compliant Ethernet Transceiver including a Media Access Controller (MAC), a PLCA Reconciliation Sublayer (RS) and a 10BASE−T1S PHY designed for industrial multi−drop Ethernet. It provides all physical layer functions needed to transmit and receive data over a single unshielded twisted pair. NCN26010 communicates to host MCUs via the Open Alliance MACPHY SPI protocol. The NCN26010 is a 10BASE−T1S Physical Layer Transceiver as specified in IEEE 802.3cg with integrated Media Access Controller (MAC) and PLCA Reconciliation Sublayer. It supports operation over a shared media (multi−drop) network segment with at least up to 25 m of a single twisted pair (UTP / STP) connection. NCN26010 provides a Serial Peripheral Interface (SPI) in slave mode, allowing low pin count connection to standard, off−the−shelf Microcontrollers or other SPI host devices. The NCN26010 provides a shared bus speed of 10 Mb/s in Half−Duplex mode. The MACPHY’s SPI protocol is compliant to the specification issued by the Open Alliance4. The NCN26010 can be locally configured to run Physical Layer Collision Avoidance (PLCA), which supports at least 8 nodes on the shared medium, depending on environmental conditions. PLCA improves data throughput under high network load and provides additional benefits:

• Nodes are granted transmit opportunities using a round robin arbitration scheme, enabling fair shared−access to the medium.
• By avoiding multiple back−off and retry events in the embedded MAC, maximum latencies are significantly reduced.
• Protects against the “babbling idiot” problem, as a single station can only transmit when granted an opportunity to do so. The integration of the PLCA reconciliation sublayer (PLCA RS) in the device enables connected hosts to take full advantage of collision−free Ethernet communication on a single twisted pair, shared medium. The integrated CSMA/CD 10 Mb/s MAC provides the following features:
• Multiple MAC address filtering
• Broadcast / Multicast filtering
• Promiscuous Mode (accept any frame regardless of type or destination address)
• FCS generation / checking
• Statistic / Diagnostic Counters
• Status reporting
• Factory−provided unique MAC address.
• 8 byte, 16 byte, 32 byte and 64 byte data chunks
• Both “Store & Forward” and “Cut−Through” operation
• Protected and Unprotected control transactions
• 4 kByte TX−Buffer
• 4 kByte RX−Buffer Additional non−standard features are implemented into NCN26010:
• Enhanced Noise Immunity PMA operation (ENI)
• Collision detection masking
• PLCA Precedence Mode
• PLCA coordinator selec

• 10BASE−T1S – IEEE 802.3cg Compliant
• 3.3 V Supply Voltage
• Two Configurable Digital Outputs that can Drive Low Current LEDs
• Low Profile 4 mm x 4 mm QFN 32 / TQFP32 (5 mm x 5 mm)
• Integrated MAC and 10BASE−T1S PHY Open Alliance Compatible SPI Interface for Exchanging Configuration and Data Frames to Host
• Supports IEEE802.3 CSMA/CD Collision Detection
• Physical Layer Collision Avoidance (PLCA) through Local Configuration for Collision−Free Operation on a Shared Medium (Multi Drop)
• Enhanced Noise Immunity Mode, Allowing Communication at Noise Levels Exceeding IEEE 802.3cg Specifications
• Supports >8 Nodes over >25 m UTP Cable
• Fast Startup: <100 ms
• Support for Bootstrap in Isolated Mode
• These are Pb−Free Devices

• Industrial Automation
• Sensor Interfacing
• Home / Building Control
• Security and Field Instrumentation