Automotive Gigabit Ethernet switch comes with optical ports

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By Christoph Hammerschmidt

Spanish technology company KDPOF, which specialises in gigabit connectivity over fibre optics, has introduced the EVB9351-AUT-SW-NXP, which it claims is the first automotive Ethernet switch with five 1000BASE optical RH ports, each consisting of KDPOF’s KD9351 FOT and KD1053 PHY IC. At the heart of the KDPOF development is NXP’s SJA1110 highly integrated switch IC.

The EVB9351-AUT-SW-NXP automotive Ethernet switch board from KDPOF has two such switch ICs on board. The component also integrates an ARM Cortex-M7 @200MHz processor for autonomous and secure operation: 512 kB of integrated SRAM as Instruction Tightly Coupled Memory (ITCM) and 256 kB of integrated SRAM as Data Tightly Coupled Memory (DTCM). It also contains a double precision floating point unit and a memory protection unit. The boot time is less than 100 ms with a 512 kB firmware with authentication. Such short boot times are essential in automotive applications.

The switch board has selectable I/O voltages (1.8 V; 2.5 V and 3.3 V) to increase design flexibility. It has a small footprint of 14 mm by 14 mm (LFBGA256) and a 0.8 mm pitch package. The device is automotive qualified to AEC-Q100, complies with ISO 26262 and is ASIL-B compliant. Operation at 2.5 Gbit/s is supported for two SGMII ports. The board has five 1000/100BASE-RH optical ports, twelve 100BASE-T1 ports and one NXP SABRE expansion connector.

With the KD9351 optical interface, KDPOF complements the proven KD1053 digital interface IC to provide a complete optical port for in-vehicle Gigabit networking. The assembly of the FOT and the IC is simplified and the connector offers a “snap-in” connection without soldering. The components form a complete 1000BASE-RHC physical layer for vehicles. The integration of the transimpedance amplifier, photodiode, LED driver and LED in a single component significantly reduces costs.

The optical Ethernet connections are the perfect solution to the challenges and electrical interference in vehicles thanks to their electromagnetic compatibility, reliability and low cost. Applications include secure Ethernet backbones, smart antenna modules and sensor connections for ADAS and audio/video.


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