COM20019IP

Low cost ARCNET controller with 2Kx8 on-board RAM

GENERAL DESCRIPTION

SMSC"s COM20019I is a member of the family of Embedded ARCNET Controllers from Standard Microsystems Corporation. The device is a general purpose communications controller for networking microcontrollers and intelligent peripherals in industrial, automotive, and embedded control environments using an ARCNET protocol engine. The flexible microcontroller and media interfaces, eight- page message support, and extended temperature range of the COM20019I make it the only true network controller optimized for use in industrial, embedded, and automotive applications.

Product Features

■ New Features:

■  − Data Rates up to 312.5 Kbps

■  − Programmable Reconfiguration Times

■ 28 Pin PLCC and 48 Pin TQFP Packages; Green, Lead-free Packages also Available

■ Ideal for Industrial/Factory/Building Automation and Transportation Applications

■ Deterministic, ANSI 878.1, Token Passing ARCNET Protocol

■ Minimal Microcontroller and Media Interface Logic Required

■ Flexible Interface For Use With All Microcontrollers or Microprocessors

■ Automatically Detects Type of Microcontroller Interface

■ 2Kx8 On-Chip Dual Port RAM

■ Command Chaining for Packet Queuing

■ Sequential Access to Internal RAM

■ Software Programmable Node ID

■ Eight, 256 Byte Pages Allow Four Pages TX and RX Plus Scratch-Pad Memory

■ Next ID Readable

■ Internal Clock Scaler for Adjusting Network Speed

■ Operating Temperature Range of -40oC to +85oC

■ Self-Reconfiguration Protocol

■ Supports up to 255 Nodes

■ Supports Various Network Topologies Star, Tree, Bus...

■ CMOS, Single +5V Supply

■ Duplicate Node ID Detection

■ Powerful Diagnostics

■ Receive All Packets Mode

■ Flexible Media Interface:

   − RS485 Differential Driver Interface For Low Cost, Low Power, High Reliability