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Which of the following is commonly used to drive a seven-segment display to show numeric digits?a.Counterb.Multiplexerc.Shift registerd.Decoder

Question

Which of the following is commonly used to drive a seven-segment display to show numeric digits?a.Counterb.Multiplexerc.Shift registerd.Decoder

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Solution

The most commonly used device to drive a seven-segment display to show numeric digits is a Decoder.

Here's why:

a. Counter: A counter is a device that counts the number of times an event occurs. While it can be used in conjunction with a seven-segment display, it doesn't drive the display itself.

b. Multiplexer: A multiplexer is a device that selects one of many inputs and forwards the selected input into a single line. It's not typically used to drive a seven-segment display.

c. Shift register: A shift register is a type of register that allows its contents to be moved from one bit to another. While it can be used to control a seven-segment display, it's not the most common method.

d. Decoder: A decoder is a circuit that changes a code into a set of signals. It is commonly used to drive a seven-segment display because it can take a binary input and output a number on the display. For example, a BCD (Binary-Coded Decimal) to 7-segment decoder takes a four-bit binary input and outputs a number on the seven-segment display.

So, the answer is d. Decoder.

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So by forward biasing the appropriate pins of the LED segments in a particular order, some segments will be light and others will be dark allowing the desired character pattern of the number to be generated on the display. This then allows us to display each of the ten decimal digits 0 through to 9 on the same 7-segment display.The displays common pin is generally used to identify which type of 7-segment display it is. As each LED has two connecting pins, one called the “Anode” and the other called the “Cathode”, there are therefore two types of LED 7-segment display called: Common Cathode (CC) and Common Anode (CA).The difference between the two displays, as their name suggests, is that the common cathode has all the cathodes of the 7-segments connected directly together and the common anode has all the anodes of the 7-segments connected together and is illuminated as follows.1. The Common Cathode (CC) – In the common cathode display, all the cathode connections of the LED segments are joined together to logic “0” or ground. The individual segments are illuminated by application of a “HIGH”, or logic “1” signal via a current limiting resistor to forward bias the individual Anode terminals (a-g).

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