CN205280898U

CN205280898U - Improved generation logic chip detector

Info

Publication number: CN205280898U
Application number: CN201520921615.8U
Authority: CN
Inventors: 车沛强
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-11-18
Filing date: 2015-11-18
Publication date: 2016-06-01
Anticipated expiration: 2025-11-18

Abstract

The utility model discloses an improved generation logic chip detector, it includes 5V power, STC89C58 main control unit, reset circuit, crystal oscillator, liquid crystal display, presses keyboard and 16P's IC locking bed, on the IC locking bed with the corresponding pin of the logic chip's that awaits measuring input and output respectively the two -way IO mouth through STC89C58 main control unit rather than being connected, the button group link is in STC89C58 main control unit's corresponding IO mouth for the selection await measuring logic chip the model and automated inspection whether carries out, the storage has logical symbol among the STC89C58 main control unit to and corresponding to various logic chip's truth table and model, STC89C58 main control unit is used for measuring the logic chip's that awaits measuring that lays model and quality on the IC locking bed, and the demonstration result of instructing liquid crystal display. The utility model discloses a logic chip detector is fit for the chip assay that all pin numbers are less than the TTL logic level of 16 (containing 16), covers up to a hundred kinds of logic chip, and it is very convenient to detect, and the cost is lower.

Description

A kind of modified version logic chip detector

Technical field

The utility model relates to a kind of electronic devices and components detection field, specifically a kind of chip detector.

Background technology

Conventional electronic devices and components, such as resistance, electric capacity, inductance, diode, triode etc., have corresponding instrument such as volt ohm-milliammeter, and LCR table etc. can detect quality and parameter, but above Common Instrument, but cannot detect the quality of logic chip. Normal detection method is the chip for different model, builds different circuit and carrys out inspection logic chip quality, wastes time and energy, in addition it is also necessary to having corresponding hardware device, cost is higher.

Practical novel content

The purpose of this utility model is to provide a kind of modified version logic chip detector, and easily, and detector can measure quality, the model of multiple logic chip in its detection, and cost is lower.

In order to realize above-mentioned purpose, the utility model adopts following technical scheme:

A kind of modified version logic chip detector, the IC comprising 5V power supply, STC89C58 principal controller, reset circuit, crystal oscillating circuit, LCD1602 liquid crystal display, button group and 16P locks seat;

By 5V power supply for whole detector provides working power;

IC is locked the pin corresponding with output terminal with the input terminus of logic chip to be measured on seat and is connected with STC89C58 principal controller by the two-way I/O port of STC89C58 principal controller respectively;

Reset circuit is connected to the reset end of STC89C58 principal controller;

Crystal oscillating circuit is connected to the clock end of STC89C58 principal controller;

LCD1602 liquid crystal display is connected with the corresponding I/O port communications of STC89C58 principal controller;

Button group is connected to the corresponding I/O port of STC89C58 principal controller, detects for selecting the model of logic chip to be measured to carry out or directly performs automatic detection chip model and quality;

STC89C58 principal controller stores logical symbol, and correspond to truth table and the model of various logic chip, model and the quality of the logic chip to be measured laid locked on seat by STC89C58 principal controller according to the input instruction of button group for measuring IC, and indicate the display result of LCD1602 liquid crystal display, make LCD1602 liquid crystal display show model and the quality of logic chip to be measured.

After adopting such scheme, modified version logic chip detector of the present utility model, during use, trigger STC89C58 principal controller by button group and export the input terminus of different logical symbols to logic chip to be measured by its I/O port, then STC89C58 principal controller obtains the output signal of logic chip to be measured by its I/O port, the truth table comparison of each logic chip of this output signal and STC89C58 principal controller store, find out the truth table of the logic chip matched, thus the model of logic chip to be measured can be confirmed, and in LCD1602 liquid-crystal display screen display. If can not find the truth table of the logic chip matched, then judge that this logic chip to be measured is bad. Logic chip detector of the present utility model, is applicable to the chip detection that all number of pins are the TTL logic level of 16P or 14P, covers hundreds of logic chip, and easily, cost is lower in detection.

Accompanying drawing explanation

Fig. 1 is practical novel schematic circuit diagram.

Embodiment

Modified version logic chip detector of the present utility model, as shown in Figure 1, the IC comprising 5V power supply, STC89C58 principal controller, reset circuit, crystal oscillating circuit, LCD1602 liquid crystal display, 4 road buttons and 16P locks seat;

By 5V power supply for whole detector provides working power;

STC89C58 principal controller has 14 two-way I/O ports, and IC locks the 1st pin of seat to the 7th pin, and the 9th pin is connected with STC89C58 principal controller by these 14 two-way I/O ports respectively to the 15th pin; IC locks the 8th pin ground connection of seat, and the 16th pin connects 5V power supply;

Reset circuit is connected to the reset end of STC89C58 principal controller;

11 I/O port communication connections that LCD1620 liquid crystal display is corresponding to STC89C58 principal controller;

Whether 4 road buttons are connected to corresponding 4 I/O ports of STC89C58 principal controller, for selecting the model of logic chip to be measured and automatically detect; Wherein, the chip model that K1 button is used for selecting last time carries out detecting and enter the chip selecting a certain model after chip model selects interface, K2 button is for reselecting chip model and enters the chip selecting a certain model after chip model selects interface, K3 button is used for automatically detecting and enter chip model and selects the chip selecting a certain model behind interface, and K4 button is for the page turning key after entering chip model and selecting interface.

STC89C58 principal controller stores logical symbol, and correspond to truth table and the model of various logic chip, model and the quality of the logic chip to be measured laid locked on seat by STC89C58 principal controller according to the input instruction of button for measuring IC, and indicate the display result of LCD1620 liquid crystal display, make LCD1620 liquid crystal display show model and the quality of logic chip to be measured.

The input and output signal of TTL logic chip, with regard to two states, is not logic " 1 ", is exactly logic " 0 ". the two-way I/O port of STC89C58 principal controller, exportable " 1 " or " 0 ", it is also possible to what detect the reception of certain I/O port is " 1 " or " 0 ". the utility model utilizes the I/O port of STC89C58 principal controller, with all inputs of logic chip, output terminal is connected, the logically truth table of chip, STC89C58 principal controller stores logical symbol, and correspond to truth table and the model of various logic chip, during use, trigger STC89C58 principal controller by button and export the input terminus of different logical symbols to logic chip to be measured by its I/O port, then STC89C58 principal controller obtains the output signal of logic chip to be measured by its I/O port, the truth table comparison of each logic chip of this output signal and STC89C58 principal controller store, find out the truth table of the logic chip matched, thus the model of logic chip to be measured can be confirmed, and in LCD1620 liquid-crystal display screen display. if can not find the truth table of the logic chip matched, then judge that this logic chip to be measured is bad.

Chip detector of the present utility model, only need to lock at IC and lay logic chip to be measured on seat, press button, and getting well with bad of this logic chip, its concrete model, is immediately shown intuitively by LCD1620 liquid crystal display. Chip detector of the present utility model is applicable to the chip detection that all number of pins are less than the TTL logic level of 16 (containing 16), covers hundreds of logic chip.

For 74LS00 chip (4 2 input nand gate), principle of work of the present utility model is described below:

74LS00 chip internal four gating circuit totally 8 input terminuss, 4 output terminals, its truth table is as shown in the table. 8 input terminuss are connected with 8 I/O ports of STC89C58 principal controller, and 4 output terminals are connected with 4 I/O ports of STC89C58 principal controller.

Truth table

See truth table above, it may also be useful to time:

1) if the model of the chip of detection last time is 74LS00, and the model of known logic chip to be measured is also 74LS00, then press No. 1 button, trigger STC89C58 principal controller and export 4 groups of logical symbols (00 by its I/O port, 01, 10, 11) to the input terminus of logic chip to be measured, then STC89C58 principal controller obtains the output signal of logic chip to be measured by its I/O port, if the output signal corresponding to 4 groups of logical symbols is respectively 1, 1, 1, when 0, then judge that this logic chip to be measured is good, if the output signal corresponding to 4 groups of logical symbols is not 1, 1, 1, 0, then judge that this logic chip to be measured is bad, and show on LCD1620 liquid crystal display.

2) if the model of the chip of detection last time is not 74LS00, and the model of known logic chip to be measured is 74LS00, then press No. 2 buttons, enter the selection of IC model, by the prompting of LCD1620 liquid crystal display, press No. 1 button and select 74 series chips, then press No. 1 button selection 74LS00. After choosing 74LS00, trigger STC89C58 principal controller and export 4 groups of logical symbols (00 by its I/O port, 01,10,11) to the input terminus of logic chip to be measured, then STC89C58 principal controller obtains the output signal of logic chip to be measured by its I/O port, if the output signal corresponding to 4 groups of logical symbols is respectively 1,1, when 1,0, then judge that this logic chip to be measured is good, if the output signal corresponding to 4 groups of logical symbols is not 1,1,1,0, then judge that this logic chip to be measured is bad, and show on LCD1620 liquid crystal display.

3) if the mark simulation of logic chip to be measured is unclear, its model cannot be distinguished from outward appearance, and its truth table is again be stored into STC89C58 principal controller, after pressing No. 3 buttons, STC89C58 principal controller, by storing the truth table of all chip models therein, is tested over one by one. If result meets the truth table of now test chip model, then show the model of now chip. If the equal comparison of truth table of all chips stored is unsuccessful, then show that this logic chip to be measured is bad. To detect the chip of new model, only need to by its truth table amended record.

Claims

1. a modified version logic chip detector, it is characterised in that: the IC comprising 5V power supply, STC89C58 principal controller, reset circuit, crystal oscillating circuit, LCD1602 liquid crystal display, button group and 16P locks seat;

By 5V power supply for whole detector provides working power;

STC89C58 principal controller has two-way I/O port, and IC is locked pin corresponding with output terminal with the input terminus of logic chip to be measured respectively on seat and is connected with STC89C58 principal controller by this two-way I/O port;

Reset circuit is connected to the reset end of STC89C58 principal controller;

Whether button group is connected to the corresponding I/O port of STC89C58 principal controller, for selecting the model of logic chip to be measured and automatically detect;