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DESIGN AND CONSTRUCTION OF A DIGITAL IC TESTER USING AT89s52 MICROCONTROLLER

 

ABSTRACT

IC’s, the main component of each and every electronic circuit can be used for wide variety of purposes and functions. But sometime due to faulty ICs the circuit doesn’t work. Indeed it is lot tedious work to debug the circuit and confirm whether the circuiting is creating problem or the IC itself is dead. So to come up with these sorts of problems we intend to make a project which would confirm whether the IC under consideration is working properly or not.

 

 

CHAPTER ONE
1.1                                          INTRODUCTION
Most of the engineering students who study digital logic design use digital logic IC’s in the lab as well as outside the lab in their projects and other applications. 
Sometimes while soldering these IC’s on the board, you may not get the proper output which would make you think whether it’s working properly or not.  In such a case,  it would be very  impractical to sit down and check each IC with the help of  LED and power supply.
This is a project based on arm7 microcontroller, which tests the 74xx series IC. The coding includes testing of 7400, 7402, 7404, 7408, 7432, 7486 IC. It can be extended further based on the need. This includes an extra board with IC holder which holds the IC’s that are to be tested.  It also includes some push button which tells the system which IC is being tested. For this, you just have to put in the IC and press the relative button to test it. 
1.2                             OBJECTIVE OF THE PROJECT
The objective of this work is to provide a simple way to quickly test the operation of most TTL and CMOS digital I.Cs

1.3                           APPLICATION OF THE PROJECT
This is very useful for testing the digital logic IC’s as there are multiple gates in each one of them and those are to be tested one at a time. In some cases we can have up to six gates, while in other cases we may have IC which takes up to 3 input.  It saves time and human effort for testing the  IC giving out the result instantaneously.

1.4                                   SCOPE OF THE PROECT
This includes an arm7 microcontroller boards for the placement of test IC, and an LCD which displays the result. The IC is placed in holder and the switch is pressed. Then a set of input is given to  its input pin and it observes the output pins.

1.5                                              PURPOSE OF THE PROJECT
This device is used testing of the IC, the result is displayed on the LCD. The basic function of the digital IC tester is to test a digital IC for correct logical.

1.6                                 PROBLEM OF THE WORK
1. Circuiting on breadboard was not firm enough.
2. With the help of internal clock, it was hard to synchronize the ICs which require clock so we created manual clock.

1.7                   FUTURE EXTENSIONS OF THE PROJECT
The project can be extended as following:
1) It Can be extended for more than 16 pin ic’s by changing some hardware and coding.
2) It Can be extended to analog IC’s

1.8                          PROJECT WORK ORGANISATION
The various stages involved in the development of this project have been properly put into five chapters to enhance comprehensive and concise reading. In this project thesis, the project is organized sequentially as follows:
Chapter one of this work is on the introduction to a digital tester. In this chapter, the background, significance, objective limitation and problem of a digital tester were discussed.
Chapter two is on literature review of a digital tester. In this chapter, all the literature pertaining to this work was reviewed.
Chapter three is on design methodology. In this chapter all the method involved during the design and construction were discussed.
Chapter four is on testing analysis. All testing that result accurate functionality was analyzed.
Chapter five is on conclusion, recommendation and references.

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