Class: Senior Secondary School 1 (SS1 / SSS 1)
Term: 2nd Term
Week: 6
Age: 15 years
Duration: 45 minutes
Subject: GSM Maintenance And Repairs
Curriculum Theme: Trade
Previous Lesson: Common Electronic Devices: Meaning And Uses Of Diodes, Transistors And ICs.
Topic: Common electronics devices
Subject Matter: Differences between digital and analogue ICs, Pin numbering of ICs, IC layout systems

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:

Define an Integrated Circuit (IC).
Differentiate between digital and analogue ICs.
Explain the importance of pin numbering in ICs.
Describe common IC layout systems.

Affective Domain:

Appreciate the role of ICs in various electronic devices.
Show interest in learning more about different types of ICs.

Psychomotor Domain:

Identify the pin numbering on a given IC using a datasheet.
Sketch simple IC layout systems.

Collaborate with peers to discuss and identify different IC types.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum for Basic Technology.
State Unified Scheme of Work for Senior Secondary Schools.
GSM Phone Repairing and Maintenance by M. A. Hassan.
https://www.tutorialspoint.com/integrated_circuits/index.htm
https://www.electronicdesign.com/technologies/components/article/21792949/what-is-an-ic-and-how-does-it-work

Instructional Materials

The teacher will teach this lesson with the aid of:

IC data sheet
IC socket
Magnifier
Circuit board with various ICs
Actual Integrated Circuits (ICs)
Projector (for displaying images of ICs and datasheets)

Rationale for the Lesson

This lesson helps pupils understand the fundamental components that make up modern electronic devices, including mobile phones. Understanding Integrated Circuits (ICs) is important for effective troubleshooting and repair of GSM devices and other electronics, which is a key skill in this trade subject.

Prerequisite/Previous Knowledge

Pupils have a basic understanding of simple electronic components like resistors, capacitors, and diodes, and can identify them in a circuit.

Lesson Content/Board Summary

Common Electronic Devices: Integrated Circuits (ICs)

Definition of Integrated Circuits (ICs)

An Integrated Circuit (IC) is a miniature electronic circuit consisting of many transistors, resistors, and capacitors fabricated together on a small piece of semiconductor material, usually silicon. ICs are also known as microchips or chips.

Differences between Digital and Analogue ICs

The following are the differences between digital and analogue ICs:

Digital ICs: These ICs operate with discrete signals, typically represented by two voltage levels (high and low, or 1 and 0). They are used in applications like microprocessors, memory chips, and logic gates.
Analogue ICs: These ICs process continuous signals that can take any value within a range. They are used in applications like amplifiers, voltage regulators, and audio processors.

Pin Numbering of ICs

Pin numbering helps in correctly connecting an IC to a circuit. Most ICs have a notch, a dot, or a bevelled edge to indicate pin 1. The pins are then numbered counter-clockwise from pin 1 when viewed from the top.

Common methods for identifying pin 1 include:

Notch: A semi-circular indentation on one end of the IC package. Pin 1 is to the left of the notch.
Dot: A small circular mark near pin 1.
Bevelled Edge: One corner of the IC package is cut at an angle, indicating the side where pin 1 is located.

IC Layout Systems

IC layout systems refer to the physical arrangement of the pins and the overall package design of an Integrated Circuit. Different layouts are used depending on the application and the number of pins required.

The following are common IC layout systems:

DIP (Dual In-line Package): This is a common through-hole package with two parallel rows of electrical connecting pins.
SOP (Small Outline Package): A surface-mount package with leads extending from two sides of the body.
QFP (Quad Flat Package): A surface-mount package with leads extending from all four sides of the body.
BGA (Ball Grid Array): A surface-mount package where the electrical connections are made via an array of solder balls on the underside of the package.

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils and reviews the previous lesson briefly. The teacher then asks pupils to name some electronic devices they use daily and asks what makes them work. The teacher introduces the topic of Integrated Circuits (ICs) as the “brains” of these devices.
Pupils’ Activity: Pupils respond to questions and listen attentively to the introduction.
Learning Point: Pupils are prepared for the lesson and recall previous knowledge.

Step 2: Definition of Integrated Circuits (ICs)

Time: 5 minutes
Teaching Skill: Explanation/Definition
Teacher’s Activity: The teacher defines an Integrated Circuit (IC) and explains its basic composition (transistors, resistors, capacitors on a single chip). The teacher writes the definition on the board.
Pupils’ Activity: Pupils listen, take notes, and ask questions for clarification.
Learning Point: Pupils understand what an Integrated Circuit is.

Step 3: Differences between Digital and Analogue ICs

Time: 10 minutes
Teaching Skill: Comparison/Differentiation
Teacher’s Activity: The teacher explains the fundamental differences between digital and analogue ICs, giving examples of where each type is commonly used (e.g., microprocessors for digital, amplifiers for analogue). The teacher highlights the distinction between discrete and continuous signals.
Pupils’ Activity: Pupils listen, observe diagrams (if provided), and contribute examples of devices that might use each type of IC.
Learning Point: Pupils can differentiate between digital and analogue ICs.

Step 4: Pin Numbering of ICs

Time: 8 minutes
Teaching Skill: Demonstration/Identification
Teacher’s Activity: The teacher explains the standard method of pin numbering on ICs, demonstrating with actual ICs and an IC data sheet. The teacher shows how to identify pin 1 using the notch, dot, or bevelled edge. The teacher draws a simple IC diagram on the board to illustrate.
Pupils’ Activity: Pupils observe the demonstration, examine the provided ICs and datasheets, and practice identifying pin 1.
Learning Point: Pupils understand the importance and method of pin numbering on ICs.

Step 5: IC Layout Systems

Time: 7 minutes
Teaching Skill: Explanation/Classification
Teacher’s Activity: The teacher introduces various common IC layout systems such as DIP, SOP, QFP, and BGA. The teacher explains the characteristics of each layout and their typical applications, using visual aids or sketches on the board.
Pupils’ Activity: Pupils listen, take notes, and observe the different IC packages presented.
Learning Point: Pupils can identify and describe different IC layout systems.

Step 6: Practical Demonstration/Application

Time: 5 minutes
Teaching Skill: Practical Application
Teacher’s Activity: The teacher distributes various ICs (e.g., a 555 timer IC, a logic gate IC, a microcontroller) and their corresponding datasheets to groups of pupils. The teacher guides pupils to identify the type of IC, count its pins, and locate pin 1 using the methods taught.
Pupils’ Activity: Pupils work in groups to examine the ICs and datasheets, identifying pin numbers and types.
Learning Point: Pupils apply their knowledge to real-world ICs.

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

Define an Integrated Circuit (IC).
State two differences between a digital IC and an analogue IC.
How do you identify Pin 1 on an Integrated Circuit?
Mention two common IC layout systems.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 5 minutes
Teaching Skill: Summarization/Assignment
Teacher’s Activity: The teacher summarizes the key points of the lesson, reiterating the importance of ICs in electronic devices. The teacher assigns homework: “Draw and label a simple DIP package IC showing its pin numbering.”
Pupils’ Activity: Pupils listen to the summary and copy down the homework.
Learning Point: Pupils consolidate their learning and prepare for further study.

Lesson Keywords

Integrated Circuit (IC) – A miniature electronic circuit on a small semiconductor chip.
Digital IC – An IC that processes discrete, two-state signals (0s and 1s).
Analogue IC – An IC that processes continuous, varying signals.
Pin Numbering – The systematic identification of connection points on an IC.
DIP (Dual In-line Package) – A common IC package with two parallel rows of pins.
SOP (Small Outline Package) – A surface-mount IC package with leads on two sides.

Differentiation

For pupils who grasp concepts quickly, the teacher can provide more complex IC datasheets for analysis or challenge them to research specialized ICs used in GSM devices. For pupils needing more support, the teacher will provide simplified diagrams and offer one-on-one guidance during the practical identification activity, focusing on basic identification of pin 1 and distinguishing between digital and analogue concepts.

Note for teachers using this lesson plan

Ensure you have a variety of physical ICs (DIP, SOP if possible) and corresponding datasheets available for the demonstration and practical activity. A projector will be very useful for displaying clear images of ICs, pin numbering conventions, and datasheet excerpts. Emphasize safety precautions when handling electronic components. Encourage pupils to ask questions and share their observations during the practical session.