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BY :- SUNIL RAINA
PIYUSH SONAWANE PARIMAL SIKCHI
Digital IC Tester
CERTIFICATE
PUNE VIDYARTHI GRIHA’SCOLLEGE OF ENGINEERING AND TECHNOLOGY
DEPARTNMENT OF ELECTRONICS & TELECOMMUNICATION ENGINEERING,ACADEMIC YEAR 2009-2010
This is to certify that-
Mr. SUNIL RAINA (T3073067)Mr. PIYUSH SONAWANE (T3073066)
Mr. PARIMAL SIKCHI (T3073065)
have satisfactorily carried out mini-project entitled “Digital IC Tester” in our premises under the guidance of Prof. N.P.DESHPANDE for the partial fulfillment of term-work in the subject “Electronic System Design And Mini Project” of third year in the Department of Electronics & Telecommunication Engineering.
PROJECT EXTERNAL HEAD OF DEPT. GUIDE EXAMINAR E & TC
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Digital IC Tester
TABLE OF CONTENTS
Sr. No. CONTENTS Page No.
1 Abstract 51 Introduction to digital IC tester 62 Background 83 Block Diagram 104 Features of IC tester circuit 105 Technical Specifications 115 Introduction to LCD 126 Introduction to KEYPAD 137 IC tester circuit diagram 148 PCB Layouts 159 Algorithm of program 17
10 Flow chart 1811 Logic involved 1912 Code for IC testing 2013 Problems and Troubleshooting 4014 Conclusions 4215 Future Scope of Work 4316 Component list and their cost 4417 References 4618 Software used 46
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Digital IC Tester
ACKNOWLEDGEMENT
The completion of any project brings with it a sense of satisfaction, but it is never complete without thanking those people who made it possible and whose constant support has crowned our efforts with success.
We are thankful our guide, Prof. N.P. Deshpande, Head of the Department, Electronics and Telecommunication PVG’s COET, PUNE, of Electronics and Telecommunication for his expert guidance, encouragement and valuable suggestions at every step.
We would like to express our gratitude to Prof. R.G. Kaduskar, for encouraging and inspiring us to carry out the project in the department lab.
We also would like to thank all the staff members and lab assistants of E&TC dept. for providing us with the all required facilities and support towards the completion of the project.
We would also like to thank our seniors who always helped us to overcome our problems during the course of the project.
We are extremely happy to acknowledge and express our sincere gratitude to our parents for their constant support and encouragement and last but not the least, friends and well wishers for their help and cooperation and solutions to problems during the course of the project.
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Digital IC Tester
ABSTRACT
The digital IC tester is implemented by using the 89C51 microcontroller board.
The processing of the inputs and outputs is done by the microcontroller. The display part on
the microcontroller board is modeled using LCD. After the successful 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
functioning as described in the truth table and/or function table. It can test digital ICs having a
maximum of 24 pins. Since it is programmable, any number of ICs can be tested within the
constraint of the memory available. This model applies the necessary signals to the inputs of
the IC, monitoring the outputs at each stage and comparing them with the outputs in the truth
table. Any discrepancy in the functioning of the IC results in a fail indication, displays the faulty
and good gates on the LCD. The testing procedure is accomplished with the help of keys
present on the main board.
At this stage we had completed to test the most common used digital IC's used in our laboratories, mainly belonging to the 74TTL series and successfully completed writing assembly code for 10 IC’s. This tests various types of IC's like OR, XOR, NAND, AND, NOT, NOR, XNOR GATES and also FULL ADDER, MULTIPLEXER, SHIFT REGISTER.
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Digital IC Tester
INTRODUCTION
In any manufacturing industry there are continuous efforts in cost reductions, upgrade
quality and improve overall efficiencies. In electronic industry, with dramatic increase in circuit
complexity and the need for the higher levels of reliability, a major contributor cost in any
product can be in the testing. However we should recognize in the real world that no product
is perfect, so that testing and in particular automatic testing will be an essential part of
production in the foreseeable future.
In industries, research centers and college, some common IC's are frequently used;
many times people face problems due to some fault in these integrated circuits. So it is very
essential to test them before actually using them in any of the applications. Microcontroller
based digital IC tester is best solution for these problems.
This project has the capability of testing any available digital IC of the TTL or CMOS
family of 24 pins. The main advantage over the industry standard for the project is its low cost
and eases of updating to any new IC design which may be inducted in the market by any
company only through software updating.
The IC-tester tests the basic logic gates used in the digital laboratory of colleges. It
uses 89c51 as the controlling and processing unit. The keyboard and the display circuits are
interfaced with the master microcontroller. The input is given to the corresponding pins of the
IC to be tested using program stored in micro-controller acting as slave. The output is taken
from the relevant pin. It is compared with the look-up table of that IC being stored in the
memory. Depending on the result of comparison, the output is displayed in the LCD display.
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Digital IC Tester
Microcontrollers have become ubiquitous in electronic applications.
However the system supported by these devices has become exceedingly complex in terms of
functionality and the quantity of peripheral components. In recent years the boundaries of such
systems have stretched to include additional peripheral components marking the advent of
system-on-chip(S o C). The motivation to develop such devices has been to increase
functionality and performance while reducing system cost, integrity complexity and power
dissipation.
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Digital IC Tester
BACKGROUND OF DIGITAL IC TESTER
The digital IC tester is implemented in order to test the digital IC’s to verify the faulty
gates and the good gates. The necessary inputs to the gates of the IC to be tested which is
placed in the ZIF socket is received from the slave micro-controller IC and corresponding
outputs are accumulated and sent to the same controller IC where the output is compared
with the functional or the logic table and if any discrepancy results, it displays the fail in the
LCD display screen. Analog IC tester is also available in the market which was replaced by this
digital IC tester which is more sophisticated by performing the tasks in a much easier fashion
and the execution time also very fast in it
The primary purpose of this digital IC tester is that it can easily check the IC within due
course of time and if any discrepancy results then it determines the gates which were good
ones and which were the bad ones. The manual operation or a human intervention includes
testing of each individual IC by making necessary connections and verifying the outputs for
each gate by the truth table is a time taking and tedious process.
With the implementation of the micro controller units it makes the job much easier to
receive data for the respective gates and process output and display results. The operation of
a MCU based controller is determined primarily by its program.
Microcontrollers are versatile. MCUs are very useful, since its approach is
programmable, many additional features are possible at little or no added cost.
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Digital IC Tester
And the main advantage of this circuit is that whenever a new IC is to be tested it does
not include any addition of hardware but a slight updating in the software code is sufficient
enough.
The IC TESTER CIRCUIT is one among the many applications of the MICROCONTROLLER
BOARD. The IC which is to be tested is mounted on the ZIF socket. The inputs are fed to the IC
which is primarily processed through the slave controller board. The program is written in
such a way that comparisons are to be made between the expected data from the truth table
and the data that is obtained from the data bus which is nothing but the outputs of the IC that
is in testing process. Finally a display has to be made on the LCD display which is located in the
main controller board specifying which gates of the IC are working and which are not.
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Digital IC Tester
FEATURES OF IC TESTER
1: User friendly set up and operates.
2:16 X 2 character LCD display.
3: Built in 2 functions and 10 numerical keys.
4: Identifies over 10 CMOS / TTL digital ICs (up to16 pins).
5: Various LED’S and LCD display to present the test results FAIL or PASS.
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Digital IC Tester
TECHNICAL SPECIFICATIONS:
FAMILY : TTL, CMOS,
RANGE : Logic Gates, Shift Register, Adder and Multiplexer can be tested. TEST SOCKETS : A single 24 pin ZIF sockets for IC Testing.
PACKAGE : DIP14, 16, 20 and 24 pins.
DISPLAY : 16X2 LCD Display. INDICATOR LEDs: 4 bright LEDs of 3 mm each.
KEY PAD : 4X3 MATRIX TYPE.
ELECTRICAL : 230 V (+/- 10 %), 1 phase, 50 Hz (+/- 2 %)
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Digital IC Tester
LCD
The LCD in the board is 16X2 characters display.
PIN DIAGRAM OF 16X2 LCD:
DB0-DB7: Data pins
RS: Register select. If RS =0, the instruction command code register is selected, allowing the
user to send a command such as clear display, cursor at home etc. If RS=1, the data register
is selected allowing the user to send data to be displayed on the LCD.
R/W: Read or Write. R/W=1 when reading;
R/W=0 when writing.
E: Enable. The Enable pin is used by LCD to latch information presented to its data pins.
When data is supplied to data pins, a high to low pulse must be applied to this pin in order
for the LCD to latch in the data present at the data pins.
LCD COMMAND CODES:
08 h-Displays off, cursor off
01h-Clear Display screen
06-Increment cursor (shift cursor to right)
0ch- Display on, cursor off.
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Digital IC Tester
80H – Force cursor to beginning of first line
0C0h - Force cursor to beginning of first line
4X3 KEY-PAD:
Row pins are connected to lower 4 pins of port 1. And column pins are connected to lower 3
pins of port 3.
The keyboard section is as shown in the figure below. The keyboard is designed as a matrix and is interfaced to port 1 of the master IC. Here P1.0, P1.1, P1.2, P1.3 are configured as input ports, and P3.0, P3.1, P3.2 are configured as output ports. The keyboard consists of 10 digits as well as an ‘ENTER’ button and ‘RESET’ button.
In case of matrix Keypad both the ends of switches are connected to the port Pin. Over here we have considered a 4x3 matrix keypad i.e. four rows and three columns. So in all twelve switches have been interfaced using just seven lines. The adjoining figure shows the diagram of a matrix keypad and how it is interfaced with the controller.
As you can see no pin is connected to ground, over here the controller pin itself provides the ground. We pull one of the Column Pins low & check the row pins if any of the Pin is low then we come to know which switch is pressed.
Suppose we make column 1 pin low and while checking the rows we get Row 3 is low then we come to know switch 7 has been pressed.
EXPERIMENTAL ASPECTS:
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Digital IC Tester
CIRCUIT DIAGRAM
PCB LAYOUTS
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Digital IC Tester
Track Side
Component Side
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Digital IC Tester
PCB LAYOUTS
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Digital IC Tester
ALGORITHM OF CODE FOR DIGITAL IC TESTER
I. Begin.
II. Reset the circuit.
III. Initialize the LCD.
IV. Display the message “Enter IC number”.
V. Wait for some time.
VI. Press the IC number on the keypad.
VII. Display the IC number.
VIII. Send the code of the respective IC from master microcontroller to slave microcontroller.
IX. Check the working of IC depending upon the truth tables and functional tables.
X. Depending upon the output, give the control signals to the master microcontroller to
display respective messages on LCD.
XI. Stop.
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Digital IC Tester
FLOWCHART OF THE IC TESTER PROGRAM
LOGIC TO TEST AN IC
18
Start
Reset the Circuit
Initialize the LCD
Display the Message
“Enter IC no.”
Accept and Display
IC no
Check IC working
Stop
Send control signals to Master
Display messages on LCD
Send IC no. to slave
Digital IC Tester
The logic to test an IC is very simple. We can test it using their truth tables and functional tables. In case of logic gates, we should check truth tables and in case of ICs like shift register, full adder, multiplexer etc we should check functional tables.
Let us take an example of logic gate IC 7400 i.e. NAND gate. In this gate first two terminals are the inputs and third terminal is the output. So we are externally giving inputs to first 2 pins of IC and checking the 3rd terminal. If the desired output is obtained, LCD displays PASS and if the output is wrong, LCD displays FAIL.
PROGRAM FOR MASTER CONTROLLER
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Digital IC Tester
; FOR OLD KIT
; FOR MICRONTROLLER WITH DIP PACKAGE.
PN EQU 40H
ORG 00H
LJMP MAIN
ORG 50H
MAIN:
MOV R6, #00H
MOV R1, #00H
MOV SP, #70H ; stack pointer to 70h
LCALL LCDINIT ; LCD INITIALISATION
MOV A, #80H ; SELECT FIRST LINE
LCALL COMMAND ; SAVE TO COMMAND
MOV DPTR, #MSG1 ; DISPLAY FIRST MESSAGE
MOV R7, #0FH ; NUMBER OF CHAR TO DISPLAY
LCALL DISPLAY
LJMP K
LCDINIT:
MOV A, #20H
LCALL COMMAND
MOV A, #28H
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Digital IC Tester
LCALL COMMAND
MOV A, #08H
LCALL COMMAND
MOV A, #01H
LCALL COMMAND
MOV A, #06H
LCALL COMMAND
MOV A, #0DH
LCALL COMMAND
MOV A, #0CH
LCALL COMMAND
RET
COMMAND:
LCALL READY
PUSH 07H ; STORE THE CONTENT OF R7
MOV R7, A
ANL A, #0F0H
SWAP A
MOV P0, A
CLR P0.6; RS=0
CLR P0.5; W=0 WRITE
SETB P0.4; E=1
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Digital IC Tester
NOP
CLR P0.4; E=0
MOV A, R7
ANL A, #0FH
MOV P0, A
CLR P0.6; R=0
CLR P0.5; W=0
SETB P0.4; E=1
NOP
CLR P0.4
POP 07H
RET
READY:
PUSH 0E0H
WAIT:MOV P0, #0FH
CLR P0.4
CLR P0.6
SETB P0.5
SETB P0.4
MOV A, P0
CLR P0.4
SETB P0.4
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Digital IC Tester
NOP
NOP
CLR P0.4
JB 0E3H, WAIT
POP 0E0H
RET
DATA1:
LCALL READY
PUSH 07H ; STORE THE CONTENT OF R7
MOV R7, A
ANL A, #0F0H
SWAP A
MOV P0, A
SETB P0.6; RS=1
CLR P0.5; W=0 WRITE
SETB P0.4; E=1
NOP
CLR P0.4; E=0
MOV A, R7
ANL A, #0FH
MOV P0, A
SETB P0.6; R=1
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Digital IC Tester
CLR P0.5; W=0
SETB P0.4; E=1
NOP
CLR P0.4
POP 07H
RET
DISPLAY: LCALL DEBOUNCE
CLR A
MOVC A,@A+DPTR
LCALL DATA1
INC DPTR
DJNZ R7, DISPLAY
RET
K: Nop
K1: MOV P3, #0FH ; MAKE P3 AS INPUT PORT
MOV P1, #00H ; MAKE P1 AS I/P PORT
MOV A, P3 ; STORE THE KEY STATUS IN A
ANL A, #00000111b
CJNE A, #00000111b, K1 ; CHECK FOR ALL KEY RELEASED
K2: MOV P3, #0FH ; MAKE P3 AS INPUT PORT
MOV P1, #00H ; MAKE P1 AS I/P PORT
MOV A, P3 ; STORE THE KEY STATUS IN A
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Digital IC Tester
ANL A, #00000111b
CJNE A, #00000111b, K3 ; CHECK FOR ANY KEY PRESSED
AJMP K2
K3: LCALL DEBOUNCE ; FOR DEBOUNCE CHECKING
MOV P3, #0FH ; MAKE P3 AS INPUT PORT
MOV P1, #00H ; MAKE P1 AS I/P PORT
MOV A, P3 ; STORE THE KEY STATUS IN A
ANL A, #00000111b
CJNE A, #00000111b, DETECTKEY ; CHECK FOR ANY KEY PRESSED
AJMP K2
DETECTKEY:
MOV P1, #11111110B ; CHECK ROW0 1 (0 4 8 C)
MOV A, P3
ANL A, #00000111b
CJNE A, #00000111b, ROW0
MOV P1, #11111101B ; CHECK ROW1 (1 5 9 D)
MOV A, P3
ANL A, #00000111b
CJNE A, #00000111b, ROW1
MOV P1, #11111011B ; CHECK ROW2 (2 6 A E)
MOV A, P3
ANL A, #00000111b
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Digital IC Tester
CJNE A, #00000111b, ROW2
MOV P1, #11110111B ; CHECK ROW3 (3 7 B F)
MOV A, P3
ANL A, #00000111b
CJNE A, #00000111b, ROW3
LJMP K2 ; GO TO START TO CHECK KEY RELEADSED
ROW0:MOV DPTR, #KEYCODE0
LJMP FIND
ROW1:MOV DPTR, #KEYCODE1
LJMP FIND
ROW2:MOV DPTR, #KEYCODE2
LJMP FIND
ROW3:MOV DPTR, #KEYCODE3
LJMP FIND
FIND: RRC A
JNC MATCH
INC DPTR
SJMP FIND
MATCH: mov r0, #50h
CLR A
MOVC A,@A+DPTR
MOV R4, A
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Digital IC Tester
Cjne a, #45H, x1
ljmp enter
x1: cjne a,#52H,x2
ljmp reset1
x2: SUBB A,#30H
MOV B,A
mov @r0,B
inc r0
inc r1
CLR A
MOV A,R6
CJNE A,#00H, KEYOUT2
INC R6
LCALL KEYOUT1
LCALL KEYOUT
KEYOUT3:LJMP K
KEYOUT2: LCALL KEYOUT
SJMP KEYOUT3
KEYOUT1:MOV A,#0CH
LCALL COMMAND
MOV A,#0C4H
LCALL COMMAND
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Digital IC Tester
RET
KEYOUT :MOV A,#06H
LCALL COMMAND
MOV A,R4
LCALL DATA1
RET
enter:mov a,@r0
mov r7,a
dec r0
mov a,@r0
swap a
orl a,r7
mov b,a
cjne r1,#04h,e3
e1: mov dptr,#enter1
mov r5,#00h
movc a,@a+dptr
cjne a,b,e2
mov p2,r5
sjmp Q
e2: inc r5
inc dptr
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Digital IC Tester
sjmp e1
e3: mov r5,#08h
mov dptr,#enter2
movc a,@a+dptr
cjne a,b,e4
mov p2,r5
SJMP Q
e4: inc r5
inc dptr
sjmp Q
reset1:lcall lcdinit
ljmp MAIN
DEBOUNCE: MOV R2,#255
HERE1 :MOV R5,#255
HERE : DJNZ R5,HERE
DJNZ R2,HERE1
RET
MSG1: DB "ENTER IC NO:- "
enter1:db '00','02','04','08','32','86','83','95'
enter2: db '86','51'
KEYCODE0 : DB '0','1','2'
KEYCODE1 : DB '3','4','5'
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Digital IC Tester
KEYCODE2 : DB '6','7','8'
KEYCODE3 : DB '9','E','R'
Q:NOP
END
PROGRAM FOR SLAVE CONTROLLER:
l1: mov a,p0
cjne a,#0h,l1
mov a,p0
mov dptr,#t11
movc a,@a+dptr
t11:db 01h,02h,03h,04h,05h,06h,07h,08h,09h,0ah
cjne a,#01h,y1
nand0:
mov r0,#00h
mov r1,#00h
mov r2,#00h
mov r3,#00h
mov r4,#00h
nand1 :
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Digital IC Tester
lcall n00 ;CHECK FOR INPUTS 00
acall nand2
lcall n01 ; CHECK FOR INPUTS 01
acall nand2
lcall n10 ; CHECK FOR INPUTS 10
acall nand2
lcall n11 ; CHECK FOR INPUTS 11
acall nand6
nand2:jnb p0.2,nand3 ;CHECK THE OUTPUT
inc r0 ;INCREMENT R0
nand3:jnb p0.5,nand4
inc r1 ; INCREMENT R1
nand4:jnb p2.1,nand5
inc r2 ;INCREMENT R2
nand5: jnb p2.4,a11
inc r3 ; INCREMENT R3
a11: ret ;RETURN
nand6:jb p0.2,nand7
inc r0
nand7:jb p0.5,nand8
inc r1
nand8:jb p2.1,nand9
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Digital IC Tester
inc r2
nand9:jb p2.4,a1
inc r3
a1: ljmp w
y1: cjne a,#02h,y2
adder:setb p0.4 ;A=1010 AND B=1011
clr p2.5
clr p2.3
clr p2.1
setb p0.7
clr p0.2
setb p0.0
setb p2.2
setb p2.6
clr p0.3
setb p2.7
jnb p2.0,adder1
inc r0
adder1:jb p0.5,adder2
inc r0
adder2:jnb p0.1,adder3
inc r0
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Digital IC Tester
adder3:jb p2.6,adder4
inc r0
adder4:jnb p2.4,adder5
inc r0
adder5:cjne r0,#05h,adder6
setb p1.2
setb p3.7
ljmp q
adder6:setb p3.6
y7: cjne a,#8h,y8
shiftreg:mov p0,#40h
clr p2.1
setb p2.2
setb p2.7
nop
jnb p2.6,s1
inc r0
s1: clr p2.2
lcall delay
setb p2.2
jnb p2.5,s2
inc r0
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Digital IC Tester
s2: clr p2.2
lcall delay
setb p2.2
jnb p2.4,s3
inc r0
s3: clr p2.2
lcall delay
setb p2.2
jnb p2.3,s4
inc r0
s4: cjne r0,#04h,s5
setb p1.2
setb p3.7
ljmp q
s5: setb p3.6
ljmp q
delay: mov r7,#0ffh ;DELAY
delay2:mov r6,#0ffh
delay1:djnz r6,delay1
djnz r7,delay2
y8: cjne a,#9h,y9
mux: mov r0,#00h
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Digital IC Tester
clr p0.6
clr p0.7
mov p2,#80h
setb p0.3
jnb p0.4,mux1
inc r0
mux1:clr p0.3
mov p2,#84h
setb p0.2
jnb p0.4,mux2
inc r0
mux2:clr p0.2
setb p0.1
mov p2,#82h
jnb p0.4,mux3
inc r0
mux3:clr p0.1
setb p0.0
mov p2,#86h
jnb p0.4,mux4
inc r0
mux4:clr p0.0
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Digital IC Tester
setb p2.3
mov p2,#81h
jnb p0.4,mux5
inc r0
mux5:mov p2,#85h
jnb p0.4,mux6
inc r0
mux6:mov p2,#83h
jnb p0.4,mux7
inc r0
mux7:mov p2,#87h
jnb p0.4,mux8
inc r0
mux8:cjne r0,#8h,mux9
setb p1.2
setb p3.7
sjmp mux10
mux9:setb p3.6
mux10:ljmp q
y10: mov p0,#00100000b
ljmp q
;INPUTS 00
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Digital IC Tester
n00: clr p0.0
clr p0.1
clr p0.3
clr p0.4
clr p2.3
clr p2.2
clr p2.6
clr p2.5
ret
;INPUTS 01
n01: clr p0.0
setb p0.1
clr p0.3
setb p0.4
clr p2.3
setb p2.2
clr p2.6
setb p2.5
ret
;INPUTS 10
n10: setb p0.0
clr p0.1
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Digital IC Tester
setb p0.3
clr p0.4
setb p2.3
clr p2.2
setb p2.6
clr p2.5
ret
;INPUTS 11
n11: setb p0.0
setb p0.1
setb p0.3
setb p0.4
setb p2.3
setb p2.2
setb p2.6
setb p2.5
ret
w: cjne r0,#4h,x
setb p1.2
inc r4
x: cjne r1,#4h,y
setb p1.3
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Digital IC Tester
inc r4
y: cjne r2,#4h,z
setb p1.4
inc r4
z: cjne r3,#4h,z3
setb p1.5
inc r4
z3: cjne r4,#04h,q1
setb p3.7
lcall q
q1: setb p3.6
lcall q
q: nop
end
EXPERIMENTAL OBSERVATIONS
Problems & Trouble shooting
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Digital IC Tester
Problems do occur even with perfect designed circuit the problems that are faced during the
project
Use of NOP command
Considerable delays
Supply and ground to IC
Operating system for downloading hex code
Even though there are no errors in the code and the logic is also correct, sometimes
there will be a distraction on the LCD screen during displays we have to use the NOP
command- No Operation command adequate number of times such that there doesn’t occur
any characters other than the desired ones.
Considerable delays are to be given during the issue of control commands to LCD. We
know that controller is faster than the external I/O devices. So we use delays in between the
issue of control and data commands to LCD screen.
While writing procedures for the IC to be tested, the first step is to give supply and
ground connections to the IC and later proceed with the testing code. Without giving supply
and ground connections to IC, if we implement the code that is, first the logic later the supply
connections, the logic will not work i.e., it is futile. So always keep in mind that, be sure of
supply and ground connections and later proceed with the logic.
It is better to implement the design of the code in either Windows NT or windows XP
operating system for downloading the hex code in to controller board. The .exe files are
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Digital IC Tester
compatible for Windows NT or windows XP operating system but not recommended for
Windows 95 or windows 98. It is recommended to work with windows 2000 professional
operating system
CONCLUSIONS
The project has been successfully completed and the main objective of emulating an IC tester
on 89c51 micro controller has been achieved. For a given specification any IC can be checked
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Digital IC Tester
for its functionality. It takes more time to test an IC manually, with the implementation of the
system with microcontroller makes the testing procedure simpler.
So we conclude that any digital IC with the given specifications can be implemented on
IC tester circuit. This system is capable of testing the IC’s having up to 24 pins.
FUTURE SCOPE OF WORK
This digital IC tester can test various digital IC families just by the software
updating. In this project the code is written for 10 IC’s which can be extended to digital
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Digital IC Tester
families of 74XX and 40XX, but the code written might be reaching out of bounds of memory
that is available in the microcontroller. That is due to the RAM may not be sufficient to
support the whole code so we have to interface extra memory chips.
The availability of large memory capacity makes the PIC processor the best suited
surrogate for microcontroller with optimal features. So far the IC to be tested is mounted on
the ZIF socket, and the respective details of the IC are selected form the menu provided in the
micro controller board. This in turn produces the results by displaying if the IC is working or
not by mentioning the gates. One special feature which makes this project, true equipment for
industrial purpose is that to have a search procedure included in it. The search procedure is
used, so that if we place an IC in the ZIF socket the entire process of identifying the IC and then
selecting and sending the inputs to the IC’s should be done by this procedure.
This circuit has been designed with an aim to test an IC having up to 24 pins. So
necessary steps should be taken in order to utilize this project to be implemented for digital
IC’s having pins more than 24.
COMPONENT LIST & BILLING
Sr. No. COMPONENTS SPECIFICATIONS QTY
PRICE (RS)
1 AT 89C51 4 8 BIT I/O PORT, 128KB FLASH 4KB RAM 2 120
2 LCD MODULE 16X2 2 200
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Digital IC Tester
4 KEYPAD 4X3 MATRIX 1 120
5 ZIF SOCKET 24 PINS 1 90
6 CAPACITORS 10µF(25V), ELECTROLYTIC 1 2
33pF CERAMIC 4 4
1000 µF(25V), ELECTROLYTIC) 1 3
0.1 µF(25V), ELECTROLYTIC) 1 2
1 µF(25V), ELECTROLYTIC) 1 2
7 RESISTORS 8.2KΏ(1/4W) 2 2
10kΏ(1/4W) 1 1
100 Ώ(1/4W) 4 2
1kΏ(1/4W) 1 1
8 RESISTOR STACK 4.7KΏ(9 PIN) 2 6
4.7KΏ(8 PIN) 1 3
CRYSTAL 11.059 MHZ 2 20
9 DIODE 1N4007 4 8
10 LEDS RED 2 2
GREEN 2 2
11 IC 7805 +5V regulator 1 12
12 POWER CONNECTOR 1 8
13 RELIMENTS (2X2) 2 20
(4x4) 1 15
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Digital IC Tester
(8X8) 4 60
14 CONNECTOR 16 PIN 1 30
7 PIN 1 10
15 SWITCH PUSH BUTTON TYPE 1 5
16 TRANSFORMER 230V-9V STEP DOWN, 500 mA 1 45
17 PCB MICROCONTROLLER BOARD 1 150
ZIF SOCKET BOARD 1 75
POWER SUPPLY BOARD 1 10
18 CASING 200
TOTAL 1230
REFERENCES
I. The 8051 micro-controller and embedded systems by MAZIDI.
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Digital IC Tester
II. Kenneth J.Ayala, The 8051 Microcontroller, Penrum International Publications
III. www.alldatasheet.com
SOFTWARE USED
I. NOVARM DIP TRACE: for PCB layout
II. PG4UW BY ELNEC SOFTWARES
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