Ethernet PHY has industry’s lowest sleep current, says Microchip

Microchip has introduced LAN8770 IEEE 802.3bw-compliant 100BASE-T1 PHY in a compact package for automotive applications.

The compact, single-port Ethernet PHY is available in either a 5.0 x 5.0mm or 6.0 x 6.0mm wettable-flanks QFN package. This package is suitable for space-constrained applications such as the infotainment head unit, telematics modules or advanced driver assistance systems (ADAS), advises Microchip.

It provides 100Mbits per second transmit and receive capability over a single unshielded twisted pair (UTP), and exceeds automotive EMI requirements, continues the company. It is Grade 1 (-40 to +125 degrees C) automotive AEC-Q100 qualified.

It is also Microchip Functional Safety Ready. This means it is specifically designed to simplify customers’ end-product ISO26262 safety certification and has the support of specialised hardware safety features, failure modes, effects, and diagnostic analysis (FMEDA) and safety manual.

The LAN8770M and LAN8770R support communication with an Ethernet MAC via the standard MII/RMII (media independent interface/reduced MII) and MII/RMII/RGMII (reduced Gbit MII), respectively. An optional 125 or 50MHz reference clock output is also provided for RGMII and RMII applications to eliminate an external reference clock.

The LAN8770 EtherGreen energy efficiency technology provides low power operation, low power sleep and wake-up modes. There is also an optional integrated linear regulator and Microchip’s flexPWR technology for variable xMII and I/O supply voltages to enhance power performance.

Advanced PHY diagnostics via Microchip’s integrated LinkMD cable diagnostic system detect cable defects, shorts or opens. The device also provides a receiver signal quality indicator (SQI), over temperature and under voltage protection and comprehensive status interrupt support along with various loopback and test modes. The PHY family is backed by Microchip’s free LANCheck online design service that reviews customer designs. AutoSar, Linux and RTOS software drivers are also available.

A separate 100BASE-T1 to 100BASE-TX Media Converter evaluation kit is available now. A 100BASE-T1 daughter card evaluation board is available for use with Microchip’s ATSAMV71-XULT Xplained Ultra microcontroller kit as well as the SAMA5D3-EDS microprocessor kit.

The LAN8770M (MII/RMII) and LAN8770R (MII/RMII/RGMII) are supplied in 5.0 x 5.0mm 32-pin and 6.0 x 6.0mm 36-Pin QFN packages, respectively. Both devices are available for purchase today.

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