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COM20020I
5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM

COM20020I General Description
Data Sheet, Application Notes, Drivers and Design Tools

Features

New Features for Rev. D
Data Rates up to 5 Mbps
Programmable Reconfiguration Times
28 Pin PLCC and 48 Pin TQFP Packages; Lead-free RoHS Compliant 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
2K x 8 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 and Clock Multiplier for Adjusting Network Speed
Operating Temperature Range of -40°C to +85°C
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:
Traditional Hybrid Interface for Long Distances up to Four Miles at 2.5 Mbps
RS485 Differential Driver Interface for Low Cost, Low Power, High Reliability

ORDERING INFORMATION
Order Number(s)
COM20020ILJP for 28 Pin PLCC Package
COM20020I-DZD for 28 Pin PLCC Package Lead-Free RoHS Compliant Package
COM20020I-HD for 48 Pin TQFP Package
COM20020I-HT for 48 Pin TQFP Package Lead-Free RoHS Compliant Package

General Description

SMSC's COM20020ID 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 small 28 pin package, flexible microcontroller and media interfaces, eight-page message support, and extended temperature range of the COM20020ID make it the only true network controller optimized for use in industrial, embedded, and automotive applications. Using an ARCNET protocol engine is the ideal solution for embedded control applications because it provides a deterministic token-passing protocol, a highly reliable and proven networking scheme, and a data rate of up to 5 Mbps when using the COM20020ID.

A token-passing protocol provides predictable response times because each network event occurs within a predetermined time interval, based upon the number of nodes on the network. The deterministic nature of ARCNET is essential in real time applications. The integration of the 2Kx8 RAM buffer on chip, the Command Chaining feature, the 5 Mbps maximum data rate, and the internal diagnostics make the COM20020ID the highest performance embedded communications device available. With only one COM20020ID and one microcontroller, a complete communications node may be implemented.

COM20020I Data Sheet, Application Notes,
Drivers and Design Tools

Description File Name File Size Date
COM20020I Data Brief 20020db.pdf 77K 12/6/06
COM20020I Data Sheet 20020.pdf 407K 12/6/06
Reference Design Files      
Evaluation Board EVB-20020    
User's Manual for COM20020 evb20020.pdf 179K 1/18/00
COM20020 Evaluation Board Schematic 20020pc.pdf 65K 12/10/98
JEDEC File for EVB-PC20020 ISA Bus PAL pc20020.jed 2K 2/7/96
PAL for the RS-485 Transceiver for EVB-PC20020 & EVB-20051 rs485pal.zip 6K 2/7/96
Application Notes      
Application Note 5-20: ARCNET Fiber Ring an520.pdf 100K  
Application Note 7-12: Software Identification of the COM20020 Rev B, Rev C and Rev D an712.pdf 119K  
Application Note 14-2: Design Guidelines for Connecting the ARCNET Product Family, COM20019/20/22, with Renesas Technology's SH Series Microcontrollers an142.pdf 230K 12/7/05
Technical Note 7-1: ARCNET Cable Length vs. Number of Nodes for the HYC9088 in Coaxial Bus Topology tn71.pdf 121K May 1991 
Technical Note 7-5: RS485 Cabling Guidelines for the COM20020 Universal Area Network Controller (ULANC) and Experimental Procedure for Verification of RS-485 Cabling Guidelines tn75.pdf 175K May 1994 
Object Code
Unlimited royalty-free distribution rights when offered with SMSC controller.
ARCNET MAC Layer Performance Calculator Utility arcalc.zip 38K 2/7/96
Windows 98 ARCNET NDIS 4.0 Driver 1.1 arcnet98.exe 13K 11/8/99
Windows CE v2.1x Driver (Version 1.0) cedrv20.zip 57K 10/5/99
Demo Software for EVB-PC20020 demoat.zip 90K 2/7/96
ODI Drivers for NetWare 2.x (Client and Server) tmcodi.zip 72K 2/7/96
Windows NT and 95 ARCNET NDIS Miniport v3.x and 4.0 v1.1 w95nt.exe 114K 11/8/99
Network Analyzers for ARCNET Available on the Market net_anl.txt 1K 10/6/98
Source Code Contact your local SMSC representative
Anomaly Contact your local SMSC representative
Using the Adobe™ Acrobat™ Reader aacrobat.html    
Links to Other ARCNET-Related Sites
Note: These links are provided under the terms and conditions of SMSC's Web Site Use Agreement. Please refer to Legal Information.

ARCNET Trade Association
ARCNET User Group - Europe
SMSC Japan

 

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