What is a 7-Segment Display Pinout?
7 Segment Display Pinout is mostly used in electronic components which display numbers and also alphabetic characteristics. It is created with seven individual LEDs each can be on or off independently to make required characteristics or numbers. In this post, we will discuss its pinout, features, working, and other parameters. So let’s get started with Introduction to 7 Segment Display Pinout,
Table of Contents
- What is a 7-Segment Display Pinout?
- Pinout of 7 Segment Display
- Types of 7-Segment Display
- Common Anode 7 Segment Display
- Common Cathode 7 Segment Display
- Specifications of 7-Segment Display
- Forward Voltage Drop
- Forward Current
- Peak Current
- Reverse Voltage
- Power Dissipation
- Operating Temperature
- Working of 7 Segment Display
- Applications of 7-Segment Display
- Digital Clocks
- Counters
- Thermometers
- Speedometers
- Weighing Scales
- Conclusion
2. Pinout of 7 Segment Display
- The 7-segment display has 7 LEDs configured in the shape of a digit eight. Every segment comes with a certain label named as A, B, C, D, E, F, and G. The pinout which is related to these labels is mostly labeled on the back side of the display
| Pin Number | Pin Name | Description |
|---|---|---|
| 1 | A | Anode for Segment A |
| 2 | B | Anode for segment B |
| 3 | C | Anode for Segment C |
| 4 | D | Anode for segment D |
| 5 | E | Anode for Segment E |
| 6 | F | Anode for segment F |
| 7 | G | Anode for segment G |
| 8 | DP | Anode for the decimal point (if present) |
| 9 | CA | Common Anode (CA) pin |
| 10 | CC | Common Cathode (CC) pin |
7 Segment Display Pinout Working Description
- The anode of every segment A to G is connected with individual pins 1 to 7 and cathodes of all segments are connected with common anode or common cathode pin 9 or 10
- When a certain segment is required to be on the HIGH signal is given to the related anode pin
- In the case of a common anode display the LOW signal is given to the common anode pin on the selected segment. In the case of common cathode displays HIGH signal is given to the common cathode pin on the selected segment
- If many segments have to be on at the same time to display a number or character, the resultant anode pins are on with a signal high or low, and the common anode or common cathode pin is at the opposite signal that is low or high]
- The decimal point or DP anode can be on by applying the HIGH signal to its related pinout 8 for anode pins of required segments
3. Types of 7-Segment Display
- There are two main types of 7 segment display There are two types of 7-segment displays: The first one is Common Anode and the second one is Common Cathode.
3.1 Common Anode 7 Segment Display
- In common anode 7 segment display all anodes of LEDS are configured with each other and make a single pin configuration. The cathodes of every LED are also configured as a single distinct pinout. When the common anode is connected with a positive supply and the cathode of a certain LED is attached to a negative supply LED gets turned on
3.2 Common Cathode 7 Segment Display
- In a common cathode 7-segment display all cathodes of LEDs are connected with each other and make a single-pin configuration. The anodes of every LED are also made of a single pinout. When a common cathode is connected with a negative supply and the anode of a certain LED is connected to a positive supply LED gets on
4. Specifications of 7-Segment Display
- There are some important specifications of a 7-segment display are explained
4.1 Forward Voltage Drop
- The forward voltage loss is the voltage need to on the LED segments of 7 segments display. Its value is about 1.8V to 2.2V.
4.2 Forward Current
- It is current need to on the LED segments of 7 segments display. its value is about 10mA to 20mA.
4.3 Peak Current
- The peak current is the highest current that can pass through LED segments of 7 segments display. Its value is about 100mA.
4.4 Reverse Voltage
- The reverse voltage is a voltage applied to the LED segments of 7 segments displayed in the reverse direction. Its value is about five volts
4.5 Power Dissipation
- The power dissipation is the amount of power that 7 segment display can dissipate without any damage. It is about 100mw
4.6 Operating Temperature
- Its operating temperature is -40°C to 85°C.
| Parameter | Description |
|---|---|
| Digit Height | The height of each segment in millimeters or inches |
| Forward Voltage | The voltage required for the LED to turn on |
| Forward Current | The maximum current that can be passed through each LED |
| Power Dissipation | The amount of power dissipated by the display |
| Luminous Intensity | The brightness of the LED in millicandelas or candelas |
| Operating Temperature | The temperature range at which the display can operate |
| Storage Temperature | The temperature range at which the display can be stored |
| Common Anode/Cathode | Indicates whether the display is a common anode or cathode type |
5. Working of 7 Segment Display
- The working of 7 segment display is very simple. If voltage is applied to certain LED segments of the display it gets on and a correspondent character or number is displayed. Through accurate on and off of LED segments any special number of characters can be displayed
7-Segment Display Truth Table
- The truth table of 7 segment display draws every possible combination of inputs to correspondent output segments which have to be illuminated to display the required character or digit. Here we have made a truth table for the common cathode 7-segment display:
| Input | Segment A | Segment B | Segment C | Segment D | Segment E | Segment F | Segment G |
|---|---|---|---|---|---|---|---|
| 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 |
| 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 |
| 2 | 1 | 1 | 0 | 1 | 1 | 0 | 1 |
| 3 | 1 | 1 | 1 | 1 | 0 | 0 | 1 |
| 4 | 0 | 1 | 1 | 0 | 0 | 1 | 1 |
| 5 | 1 | 0 | 1 | 1 | 0 | 1 | 1 |
| 6 | 1 | 0 | 1 | 1 | 1 | 1 | 1 |
| 7 | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
| 8 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 9 | 1 | 1 | 1 | 1 | 0 | 1 | 1 |
| A | 1 | 1 | 1 | 0 | 1 | 1 | 1 |
| B | 0 | 0 | 1 | 1 | 1 | 1 | 1 |
| C | 1 | 0 | 0 | 1 | 1 | 1 | 0 |
| D | 0 | 1 | 1 | 1 | 1 | 0 | 1 |
| E | 1 | 0 | 0 | 1 | 1 | 1 | 1 |
| F | 1 | 0 | 0 | 0 | 1 | 1 | 1 |
- We can use this table to find input values to display and the required digit or character on 7 segment display. For instance to display number 7 input values are 1, 1, 1, 0, 0, 0, and 0, which will display the segments A, B, C, and G.
4 Digit 7 Segment Display Truth Table
- The 4-digit 7segment display has four separate digits with every digit consisting of 7 segments which can be on or off to display numbers and letters. The 7 segments are configured in the shape of a digit eight and can be individually regulated to show any of 10 digits from zero to 9.
- Here you can see the truth table for a 4-digit 7-segment display
| Digit | Segment A | Segment B | Segment C | Segment D | Segment E | Segment F | Segment G |
|---|---|---|---|---|---|---|---|
| 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 |
| 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 |
| 2 | 1 | 1 | 0 | 1 | 1 | 0 | 1 |
| 3 | 1 | 1 | 1 | 1 | 0 | 0 | 1 |
| 4 | 0 | 1 | 1 | 0 | 0 | 1 | 1 |
| 5 | 1 | 0 | 1 | 1 | 0 | 1 | 1 |
| 6 | 1 | 0 | 1 | 1 | 1 | 1 | 1 |
| 7 | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
| 8 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 9 | 1 | 1 | 1 | 1 | 0 | 1 | 1 |
- In this truth table, every row defines the digit and each column denotes a segment. A 1 in a certain column defines that the correspondent segment is on for a given digit and a zero define that the segment is on. For instance, the first row of the table represents the digit zero and all 7 segments are on except segment G. Like this the 2nd row denotes the digit 1 with only segments B and C turned on.
7-Segment Display Circuit Diagram
- The circuit of 7 segment display has 7 individual LED segments labeled A to G and a common cathode or anode which connects to all 7 segments. Each LED segment is attached to a distinct pinout on the microcontroller or other digital circuits, which can be adjusted to either low or high voltage to on or off the segment.
- For display certain light microcontroller sends sequences of signals to certain pins to on the required segments. For example, for display, the digit 1 microcontroller will be on only segments B and C. For display, the digit 5 microcontroller will be on the segments A, C, D, F, and G
- With that to display the digits, seven segment display circuit can also use to display letters and other characters through the use of different combinations of segments. Some seven segments display comes with an extra 8th segment that is used for displaying decimal points and other can have extra segments for certain characters or symbols
6. Applications of 7 Segment Display
- Here main applications of 7 segment display re-explained
6.1 Digital Clocks
- 7 segment displays are mostly used in digital clocks for time display
6.2 Counters
- It is also used in counters to count the display
6.3 Thermometers
- It is used in thermometers to display the temperature.
6.4 Speedometers
- It is also part of speedometers to display
Conclusion:
An electronic device’s 7-section display is a straightforward and efficient way to show numbers and characters. It is created with 7 LED segments that are designated A, B, C, D, E, F, and G which are combined in the shape of number eight. Common Anode and Common Cathode are two varieties of 7-segment displays that differ in how their anodes and cathodes are linked. Forward voltage drop, forward current, peak current, reverse voltage, power dissipation, and operating temperature are among the requirements for a 7-segment display. Digital clocks, counters, thermometers, speedometers, and other electronic equipment frequently employ 7-section displays.
FAQs
What is the Definition of a 7-Segment Display?
It is the easiest way to display numbers and characters in electronic devices and it has seven LEDs arranged in a number 8 shape.
Write the Main Types of 7-Segment Displays.
There are two main types of 7-segment displays the first one Common Anode and Common Cathode.
How Does a 7-Segment Display Work?
If voltage is given to a certain LED segment of the display it will on and releases the light permitting the segment to be seen. By turning on different segments, numbers, and characters can be displayed.
What are the Specifications of a 7-Segment Display?
The specifications of a 7-segment display include forward voltage drop, forward current, peak current, reverse voltage, power dissipation, and operating temperature.
What are the Applications of 7-Segment Displays?
Its common applications are thermometers, speedometers digital clocks, counters,, and other electronic devices.
