2.

Introduction

2.1

General Description

The Microchip LAN8670/1/2 is a compact, low power, and cost-effective single-port 10BASE-T1S Ethernet physical

layer transceiver designed according to the IEEE Std 802.3cg-2019 specification. The device provides 10 Mbit/s

half-duplex transmit and receive capability over single-balanced pair medium such as Unshielded Twisted Pair (UTP)

cable. The LAN8670/1/2 is designed for use in applications requiring extended temperature range (-40°C to +125°C).

The device is also compliant to industrial EMC and EMI requirements. The single power supply and simple analog

front end simplifies its integration into small form factor applications.

The LAN8670/1/2 allows for the creation of both multidrop and point-to-point network topologies. Point-to-point link

segments of up to at least 15m in length are supported. The multidrop mode supports up to at least 8 PHYs

connected to a common mixing segment of up to at least 25m in length. The ability to connect multiple PHYs to a

common mixing segment reduces weight and implementation costs by reducing cabling and switch ports.

The LAN8670/1/2 supports communication with an Ethernet MAC via standard MII/RMII interfaces. An integrated

serial management interface (SMI) provides rapid register access and configuration at up to 4 MHz.

Access to the physical medium is managed by CSMA/CD and optionally supplemented by Physical Layer Collision

Avoidance (PLCA).

The LAN8670/1/2 is designed to be used in functional safety related applications.

The Microchip LAN8670/1/2 family includes the following devices:

• LAN8670

• LAN8671

• LAN8672

Device specific features that do not pertain to the entire LAN8670/1/2 family are called out independently throughout

this document. Table 2-1 below provides a summary of the feature differences between family members.

Table 2-1. LAN8670/1/2 Family Feature Matrix

Part Number

Package

MII Support

RMII Support

PLCA Support

-40o to +125oC

LAN8670

32-VQFN

X

X

X

X

LAN8671

24-VQFN

X

X

X

LAN8672

36-VQFN

X

X

X

A system-level block diagram and internal block diagram of the LAN8670/1/2 are shown in the following figures.

LAN8670/1/2

Introduction

and its subsidiaries

Product Brief

DS60001536E-page 5