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Computer Interfacing by Graham Dixey (Auth.)

By Graham Dixey (Auth.)

This e-book explains how pcs have interaction with the realm round them and accordingly how you can cause them to a useful gizmo. issues lined comprise descriptions of the entire parts that make up a working laptop or computer, rules of knowledge trade, interplay with peripherals, serial verbal exchange, enter units, recording tools, computer-controlled automobiles, and printers.

In an informative and easy demeanour, Graham Dixey describes tips to flip what might sound an incomprehensible 'black field' laptop right into a robust and stress-free software which can assist you in all components of your paintings and rest. With lots of convenient assistance and transparent illustrations this ebook can enhance your machine approach, or even exhibits new makes use of for outdated package resembling motor control.

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Clock Successive approximation logic Analogue input V|N —Nv Digital l—y/ output iz. P DAC Comparator Figure 3 . 1 0 The Successive Approximation Register (SAR) type of ADC, offering a considerable speed advantage over the counter-based types A practical ADC/ DAC circuit The ZN425E IC is a versatile converter chip that can be configured by either a DAC or an ADC. By simple switching it is possible to give it a dual role, though it cannot, of course, be used as both types of converter at the same time.

What has to be considered next is how to condition this analogue signal and how to convert it to digital form so that it is acceptable to a microcomputer. 32 3 Conversion between digital and analogue We saw in the last chapter that signals generated in the real world to represent the quantities that we wish to measure and control are usually quite different from those that the computer requires. In short, they are analogue signals whereas the computer requires a digital input. In order to make the computer accept data that represents the input quantity, the analogue signal has to be converted into the appropriate digital form, for example, 8-bit binary.

The converter always makes the same 49 Computer interfacing guess at first, this being the mid-range value of the binary number, in this case 10000000. The comparator tells the SA logic that this guess is too low so the next most significant bit (MSB) is set, giving 11000000. This is clearly too large now, so the second MSB is take out again and the next MSB set, and so on. The sequence looks like this. Clock pulse SAR contents Comparator results 1 2 3 4 5 6 7 8 10000000 Too low 11000000 Too high 10100000 Too high 10010000 Too low 10011000 Too low 10011100 Too high 10011010 Too low 10011011 Correct One thing that should be evident immediately is that it only took eight clock pulses to carry out the complete conversion.

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