By Stuart Ball
Provides hard-to-find details on interfacing analog units and applied sciences to the simply electronic international of embedded microprocessors. provides the reader the perception and point of view of a true embedded platforms layout engineer, together with guidance that just a hands-on expert might understand. Covers very important issues for either and software program systmes while linking analog and electronic units. -Embedded expertise ...a accomplished resource on interfacing the true international to microprocessors may still end up important to embedded structures engineers, scholars, technicians, and hobbyists. an individual serious about connecting the analog surroundings to their electronic machines, or troubleshooting such connections will locate this publication in particular worthwhile. - Embedded expertise more often than not, for the entire sections, there are many basic diagrams and in addition the math is stored to an easy point. ...I like this ebook 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 easy diagrams and in addition the mathematics is stored to an easy point. i love this booklet and suggest it as an creation to the topic for domestic use, scholars and engineers. -Chris Hills within the ACCU journal CVu
, Page ix
, Page xi
1 - method 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 - common 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 - worthy URLs
, Pages 299-300
Appendix D - Python Code for bankruptcy eleven; Excel information for bankruptcy 4
, Pages 301-306
, Pages 307-309
, Pages 311-322
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Extra info for Analog Interfacing to Embedded Microprocessor Systems. Real World Design
This capacitance is about 150 pf. When a conversion starts, this capacitott is disconnected from the input. When a conversion ends, the capacitor is again connected to the input, and it must charge up to the value of the input pin before another conversion can start. In addition, there is an internal 150ohm resistor in series with the input capacitor. Consequently, the MAX 151 specifies a delay between conversions of at least 500 ns if the source impedance driving the input is less than 509t. 5 laS.
In this case, the processor may start the next cycle before the MAX151 has relinquished the bus. A typical example would be a fast 80960-family processor, which we will look at later in the chapter. Coupling The MAX151 has an additional specification, not found on some ADCs, that involves coupling of the bus control signals into the ADC. Because m o d e r n ADCs are built as monolithic ICs, the analog and digital portions share some internal components such as the power supply pins and the substrate on which the IC die is constructed.
05V So a 1% change in the supply voltage causes the conversion result to change by one count. Typical power supplies can vary by 2 or 3%, so p o w e r supply variations can have a significant effect on the results. T h e power supply o u t p u t can vary with loading, t e m p e r a t u r e , AC input variations, and from one supply to the next. 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.