ADC0858CIN datasheet(1/36 Pages) NSC

部件名	ADC0858CIN

功能描述	8-Bit Analog Data Acquisition and Monitoring Systems

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制造商	NSC [National Semiconductor (TI)]

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TLH11021

January 1995

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 AD converters automatic scanning AD 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 AD 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 AD conversion feature allows the device to scan

through selected input channels performing an AD conver-

sion on each channel without the need to select a new

channel after each conversion

Applications

Y

Instrumentation monitoring and process control

Y

Digitizing automotive sensor signals

Y

Embedded diagnostics

Key Specifications

Y

Resolution

8 Bits

Y

Total error

g

LSB or g 1 LSB

Y

Low power

50 mW

Y

Conversion time

18 msChannel

Y

Limit comparison time

2 msLimit

Features

Y

Watchdog operation signals processor when any

channel is outside user programmed window limits

Y

Frees microprocessor from continually monitoring

analog signals and simplifies applications software

Y

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

Y

Single ended or differential input pairs

Y

COM input for DC offsetting of input voltage

Y

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

limits

Y

NSC MICROWIRETM interface

Y

Power fail detection

Y

Auto AD conversion feature

Y

Single 5V supply

Y

Window limits are user programmable via serial inter-

face

Simplified Block Diagram

TLH11021 – 22

FIGURE 1

TRI-STATE

is a registered trademark of National Semiconductor Corporation

MICROWIRETM is a trademark of National Semiconductor Corporation

C1995 National Semiconductor Corporation

RRD-B30M75Printed in U S A

类似零件编号 - ADC0858CIN

制造商	部件名	数据表	功能描述
Texas Instruments	ADC0858	798Kb / 38P	[Old version datasheet] 8-Bit Analog Data Acquisition and Monitoring Systems

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