COM20020I
5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
Features
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New Features for Rev. D
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Data Rates up to 5 Mbps |
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Programmable Reconfiguration Times |
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28 Pin PLCC and 48 Pin TQFP Packages; Lead-free RoHS Compliant Packages also Available |
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Ideal for Industrial/Factory/Building Automation
and Transportation Applications |
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Deterministic (ANSI 878.1) Token Passing
ARCNET Protocol |
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Minimal Microcontroller and Media Interface
Logic Required |
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Flexible Interface for Use with All Microcontrollers
or Microprocessors |
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Automatically Detects Type of Microcontroller
Interface |
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2K x 8 On-Chip Dual Port RAM |
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Command Chaining for Packet Queuing |
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Sequential Access to Internal RAM |
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Software Programmable Node ID |
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Eight 256 Byte Pages Allow Four Pages TX
and RX Plus Scratch-Pad Memory |
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Next ID Readable |
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Internal Clock Scaler and Clock Multiplier for Adjusting Network Speed |
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Operating Temperature Range of -40°C
to +85°C |
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Self-Reconfiguration Protocol |
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Supports up to 255 Nodes |
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Supports Various Network Topologies (Star,
Tree, Bus...) |
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CMOS, Single +5V Supply |
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Duplicate Node ID Detection |
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Powerful Diagnostics |
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Receive All Packets Mode |
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Flexible Media Interface:
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Traditional Hybrid Interface for
Long Distances up to Four Miles at 2.5 Mbps |
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RS485 Differential Driver Interface
for Low Cost, Low Power, High Reliability |
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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
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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
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