COM20022I 3V
10 Mbps ARCNET (ANSI 878.1) Controller with 2Kx8 On-Chip RAM
Features
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New Features
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Data Rates up to 10 Mbps |
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Selectable 8/16 Bit Wide Bus with
Data Swapper |
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Programmable DMA Channel |
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Programmable Reconfiguration Times |
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48 Pin TQFP Package; Lead-Free RoHS Compliant Package Package 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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Full 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-Reconfiguring 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 +3V 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:
COM20022I3V-HD for 48 Pin TQFP Package
COM20022I3V-HT for 48 Pin TQFP Lead-Free RoHS Compliant Package |
General Description
The COM20022I 3V is a member of the family of Embedded
ARCNET Controllers from SMSC.
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 48 pin package, flexible
microcontroller and media interfaces, eight-page message support,
and extended temperature range of the COM20022I 3V 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 10 Mbps when using the COM20022I 3V. 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 10 Mbps maximum data rate, and the internal diagnostics
make the COM20022I 3V the highest performance embedded communications
device available. With only one COM20022I 3V and one microcontroller,
a complete communications node may be implemented.
 COM20022I 3V Data Sheet, Application Notes,
Drivers and Design Tools
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