COM20022I
10 Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 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 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 +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):
COM20022ITQFP for 48 Pin TQFP Package
COM20022I-HT for 48 Pin TQFP Lead-Free RoHS Compliant package |
General Description
The COM20022I 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 48 pin package, flexible microcontroller
and media interfaces, eight-page message support, and extended
temperature range of the COM20022I 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. 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 the highest performance embedded communications
device available. With only one COM20022I and one microcontroller,
a complete communications node may be implemented.
 COM20022I
Data Sheet, Application Notes,
Drivers and Design Tools
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