The Microchip LAN8700/LAN8700i is a low-power， industrial temperature （LAN8700i）， variable I/O voltage， analog interface IC with HP Auto-MDIX support for high-performance embedded Ethernet applications. The LAN8700/LAN8700i can be configured to operate on a single 3.3V supply utilizing an integrated 3.3V to 1.8V linear regulator. An option is available to disable the linear regulator to optimize system designs that have a 1.8V power plane available. 1.1 Architectural Overview The LAN8700/LAN8700i consists of an encoder/decoder， scrambler/descrambler， wave-shaping transmitter， output driver， twisted-pair receiver with adaptive equalizer and baseline wander （BLW） correction， and clock and data recovery functions. The LAN8700/LAN8700i can be configured to support either the Media Independent Interface （MII） or the Reduced Media Independent Interface （RMII）。 The LAN8700/LAN8700i is compliant with IEEE 802.3-2005 standards （MII Pins tolerant to 3.6V） and supports both IEEE 802.3-2005 compliant and vendor-specific register functions. It contains a full-duplex 10-BASE-T/100BASE-TX transceiver and supports 10-Mbps （10BASE-T） operation on Category 3 and Category 5 unshielded twisted-pair cable， and 100-Mbps （100BASE-TX） operation on Category 5 unshielded twisted-pair cable.