By Stuart Ball

ISBN-10: 0750677236

ISBN-13: 9780750677233

  • Provides hard-to-find details on interfacing analog units and applied sciences to the in basic terms electronic global of embedded microprocessors. provides the reader the perception and standpoint of a true embedded structures layout engineer, together with counsel that just a hands-on specialist might recognize. Covers vital issues for either and software program systmes while linking analog and electronic units. -Embedded know-how ...a finished resource on interfacing the genuine international to microprocessors may still turn out valuable to embedded structures engineers, scholars, technicians, and hobbyists. a person fascinated with connecting the analog setting to their electronic machines, or troubleshooting such connections will locate this ebook in particular precious. - Embedded expertise often, for the entire sections, there are many easy diagrams and in addition the mathematics is stored to an easy point. ...I like this booklet and suggest it as an advent to the topic for domestic use, scholars and SW Engineers. - Chris Hills within the ACCU journal CVu ...there are lots of uncomplicated diagrams and likewise the mathematics is stored to an easy point. i admire this ebook and suggest it as an creation to the topic for domestic use, scholars and engineers. -Chris Hills within the ACCU journal CVu

Content:
Preface

, Page ix
Introduction

, Page xi
1 - approach Design

, Pages 1-12
2 - Analog-to-Digital Converters

, Pages 13-46
3 - Sensors

, Pages 47-90
4 - Time-Based Measurements

, Pages 91-106
5 - Output regulate Methods

, Pages 107-143
6 - Solenoids, Relays, and different Analog Outputs

, Pages 145-169
7 - Motors

, Pages 171-213
8 - Electromagnetic Interference

, Pages 215-223
9 - High-Precision Applications

, Pages 225-241
10 - regular Interfaces

, Pages 243-246
11 - Analog Toolbox

, Pages 247-273
Appendix A - Opamp Basics

, Pages 275-286
Appendix B - Pulse Width Modulation

, Pages 287-297
Appendix C - valuable URLs

, Pages 299-300
Appendix D - Python Code for bankruptcy eleven; Excel info for bankruptcy 4

, Pages 301-306
Glossary

, Pages 307-309
Index

, Pages 311-322

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Extra info for Analog Interfacing to Embedded Microprocessor Systems. Real World Design

Sample text

This brings up an issue that affects all ADC designs: the accuracy of the reference. T h e Maxim MAX 1242, which we have already looked at, uses an internal reference. T h e part can convert inputs from 0 V to the reference voltage. 53 V. ) So the variation in the reference voltage from part to part can result in an o u t p u t variation of 20 counts. Codecs T h e t e r m codec has two meanings: it is short for c o m p r e s s o r / d e c o m p r e s s o r , or for coder/decoder. In general, a codec (either type) will have two-way operation; it can t u r n analog signals into digital and vice-versa, or it can convert to and from some compression standard.

In this simple application, just varying Rh Sensors 55 and RL by 1% throws the result offby 5 counts at 10~ This may or may not be a problem, d e p e n d i n g on the accuracy required. 1% resistors. This would give the following result. 478 229 112 74 24 This is m u c h closer to the ideal result. O t h e r factors that would need to be included in a real application would be the tolerance of the voltage reference and the tolerance of the thermistor itself. A n o t h e r way to get this kind of accuracy is to calibrate the system after it is built.

9 V. 9 V. Instead of switches, you could also use this technique to read the state of open-collector or open-drain digital signals. 17C shows how a thermistor or other variable-resistance sensor can be combined with an output. The microcontroller pin is p r o g r a m m e d as an analog input to read the temperature. When the pin is p r o g r a m m e d as an output and driven high, the comparator output will go low. To make this work, the operating temperature range must be such that the voltage divider created by the thermistor and the pullup resistor never brings the analog input above 3 V.

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Analog Interfacing to Embedded Microprocessor Systems. Real World Design by Stuart Ball


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