adc0858civ National Semiconductor Corporation, adc0858civ Datasheet

adc0858civ

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adc0858civ

Description

8-bit Analog Data Acquisition And Monitoring Systems

Manufacturer

National Semiconductor Corporation

Datasheet

1.ADC0858CIV.pdf (36 pages)

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C 1995 National Semiconductor Corporation

ADC0851 and ADC0858 8-Bit Analog Data

Acquisition and Monitoring Systems

General Description

The ADC0851 and ADC0858 are 2 and 8 input analog data

acquisition systems They can function as conventional mul-

tiple input A D converters automatic scanning A D convert-

ers or programmable analog ‘‘watchdog’’ systems In

‘‘watchdog’’ mode they monitor analog inputs and deter-

mine whether these inputs are inside or outside user pro-

grammed window limits This monitoring process takes

place independent of the host processor When any input

falls outside of its programmed window limits an interrupt is

automatically generated which flags the processor the chip

can then be interrogated as to exactly which channels

crossed which limits

The advantage of this approach is that its frees the proces-

sor from having to frequently monitor analog variables It

can consequently save having to insert many A D subrou-

tine calls throughout real time application code In control

systems where many variables are continually being moni-

tored this can significantly free up the processor especially

if the variables are DC or slow varying signals

The Auto A D conversion feature allows the device to scan

through selected input channels performing an A D conver-

sion on each channel without the need to select a new

channel after each conversion

Applications

Simplified Block Diagram

TRI-STATE is a registered trademark of National Semiconductor Corporation

MICROWIRE

Instrumentation monitoring and process control

Digitizing automotive sensor signals

Embedded diagnostics

is a trademark of National Semiconductor Corporation

TL H 11021

FIGURE 1

Key Specifications

Features

Resolution

Total error

Low power

Conversion time

Limit comparison time

Watchdog operation signals processor when any

channel is outside user programmed window limits

Frees microprocessor from continually monitoring

analog signals and simplifies applications software

2 (ADC0851) or 8 (ADC0858) analog input channels

Single ended or differential input pairs

COM input for DC offsetting of input voltage

4 (ADC0851) and 16 (ADC0858) 8-bit programmable

limits

NSC MICROWIRE

Power fail detection

Auto A D conversion feature

Single 5V supply

Window limits are user programmable via serial inter-

face

interface

RRD-B30M75 Printed in U S A

LSB or

18 ms Channel

TL H 11021 – 22

January 1995

2 ms Limit

50 mW

1 LSB

8 Bits

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