LAN88730AM-C datasheet(4/82 Pages) MICROCHIP

4 / 82 page

LAN88730

DS60001256B-page 4

 2012-2015 Microchip Technology Inc.

1.0

INTRODUCTION

1.1

General Terms and Conventions

The following is a list of the general terms used throughout this document:

1.2

General Description

The LAN88730 is a low-power 10BASE-T/100BASE-TX physical layer (PHY) transceiver with variable I/O voltage that

is compliant with the IEEE 802.3 and 802.3u standards. The LAN88730 has been designed and tested to automotive

grade specifications.

The LAN88730 supports communication with an Ethernet MAC via a standard MII (IEEE 802.3u)/RMII interface. It con-

tains a full-duplex 10-BASE-T/100BASE-TX transceiver and supports 10 Mbps (10BASE-T) and 100 Mbps (100BASE-

TX) operation. The LAN88730 implements auto-negotiation to automatically determine the best possible speed and

duplex mode of operation. HP Auto-MDIX support allows the use of direct connect or cross-over LAN cables.

The LAN88730 supports both IEEE 802.3-2005 compliant and vendor-specific register functions. However, no register

access is required for operation. The initial configuration may be selected via the configuration pins as described in Sec-

tion 3.7, "Configuration Straps". Register-selectable configuration options may be used to further define the functionality

of the transceiver.

Per IEEE 802.3-2005 standards, all digital interface pins are tolerant to 3.6 V. The device can be configured to operate

on a single 3.3 V supply utilizing an integrated 3.3 V to 1.2 V linear regulator.

The LAN88730 is available in automotive grade A (-40°C to +85°C) and B (-40°C to +105°C) temperature range ver-

sions. A typical system application is shown in Figure 1-1. Figure 1-2 provides an internal block diagram of the device.

BYTE

8 bits

FIFO

First In First Out buffer; often used for elasticity buffer

MAC

Media Access Controller

MII

Media Independent Interface

RMII™

Reduced Media Independent Interface

N/A

Not Applicable

Indicates that a logic state is “don’t care” or undefined.

RESERVED Refers to a reserved bit field or address. Unless otherwise noted, reserved bits must always be zero

for write operations. Unless otherwise noted, values are not guaranteed when reading reserved bits.

Unless otherwise noted, do not read or write to reserved addresses.

SMI

Serial Management Interface

FIGURE 1-1:

SYSTEM BLOCK DIAGRAM

LAN88730

10/100

Ethernet

MAC

MII/

RMII

Mode

LED

Transformer

Crystal or

Clock

Oscillator

MDI

RJ45

LAN88730AM-C Datasheet(PDF) 4 Page - Microchip Technology

LAN88730AM-C Datasheet(HTML) 4 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82

Datasheet Download

Link URL