COM20051 View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

Manufacturer

COM20051

Integrated Microcontroller and Network Interface with Watchdog Timer and A/D Converter Interface

SMSC -> Microchip 

OVERVIEW

The COM20051+ is essentially a data

acquisition/network board-in-a-chip. It takes an

80C32-like microcontroller core, an ARCNET

controller, a watchdog timer, and an analog data

acquisition port and integrates them into a

single device. ARCNET is a token passing-

based protocol that combines powerful flow

control, error detection, and diagnostic

capabilities to deliver fast and reliable

messages. The COM20051+ supports a variety

of data rates (5 Mbps to 156 Kbps), topologies

(bus, star, tree), and media types (RS-485,

coax, twisted pair, fiber optic, and powerline) to

suit any type of application.

The ARCNET network core of the COM20051+

contains many features that make network

development simple and easy to comprehend.

Diagnostic features, such as Receive All,

Duplicate ID Detection, Reconfiguration

Detection, Token, and Receiver Detection, all

combine to make the COM20051+ simple to use

and to implement in any environment. The

ARCNET protocol itself is relatively simple to

understand and very flexible. A wide variety of

support products are available to assist in

network development, such as software drivers,

line drivers, boards, and development kits. The

COM20051+ implements a full-featured 16MHz,

Intel code-compatible 80C32-like microcontroller

with all of the standard peripheral functions,

including a full duplex serial port, two

timer/counters, one 8-bit general purpose digital

I/O port, and interrupt controller. The 8051

architecture has long been a standard in the

embedded control industry for low-level data

acquisition and control. ARCNET and the 8051

form a simple solution for many of today's and

tomorrow's low-level networking solutions.

The COM20051+ also includes a programmable

watchdog timer for fail-safe operation. The

watchdog timer has programmable timeout

values ranging from 3.3ms to 6.5s, with a

programmable reset feature (either a pulsed

reset or reset and hold). A full analog data

acquisition port is also included in the

COM20051+. The data acquisition port

interfaces to most types of parallel A/D

converters. The data acquisition port provides

all the handshaking and data buffering fuctions

normally associated with repetitive sampling

tasks. An internal 32-byte FIFO buffers the

samples in chronological order and interrupts

the processor at a programmed limit.

Offloading repetitive sampling and buffering

tasks frees the microcontroller core tasks such

as data formatting and processing and

communications tasks.

In addition to the 80C32 and the ARCNET

network core, the COM20051+ contains all the

address decoding and interrupt routing logic to

interface the network core, the watchdog timer,

and the data acquisition port to the 80C32 core.

The integrated 8051/ARCNET combination

provides an extremely cost-effective and space-

efficient solution for industrial networking

applications. The COM20051+ can be used in a

stand-alone embedded application, executing

control algorithms or performing data

acquisition and communicating data in a

master/slave or peer/peer configuration, or used

as a slave processor handling communication

tasks in a multi-processing system.

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