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When HIGH, the lamp test is activated. This is because we want to strobe the outputs to the 7 segment LED display. When pressed, it will go LOW and turn off all the outputs.

The 4 input data pins, which control the digit which is shown on the 7-segment LED display, are D, C, Datashet, and A which are pins 6, 2, 1, and 7, respectively. This chip saves us a lot of work for that reason. Remember Me Lost your password?

It’s simply to test all the outputs to check if they turn on. The equivalent decimal value of the binary value we feed into the data input pins will be shown.

How to Build a 4511 BCD to 7 Segment Decoder Circuit

In this circuit, we will build a BCD to 7 segment display decoder circuit using the chip. Already have an account? The chip takes in a binary value and displays the equivalent decimal value on the 7 segment display. We will connect this chip by itself to pushbuttons.


Pin 4 is the Blanking pin. Using the 7 segments, you can make any decimal digit. First we need to familiarize ourselves with the 7 segment module. For example, a on the matches to a on the 7 segment LED display, b matches with b, etc. This establishes sufficient power to the chip. The chip is capable of handling up to 20V.

So the 7 segment LED display will show a 0 initially. The decimal digit that the 7 segment display shows out depends on the binary value fed into the 4 input data pins DBCA. When LOW, the pin is in strobe mode, meaning it strobes the output to a given device, which in this case is a 7 segment LED display. The really makes it much simpler to work with single 7 segment LED displays.

How to Build a BCD to 7 Segment Decoder Circuit

So, for example, if we want to show the decimal number 5, we give a value of to the DCBA data pins. The segments are then displayed on the basis of those internal registers. Being that we don’t want the blanking feature activated, we simply connect it permanently to HIGH. There are 4 data pins hold a binary value. This pin would blank all the outputs if connected LOW or to ground.

We can show the digits 0 through 9. Otherwise, you would datasheeet to know which pins on the 7 segment display to turn on or off, making it much more complicated. This means that the negative side of all the LEDs are connected together.


For normal operation, Latch Enable LE is held high, but when it is grounded, the takes the 4 line input and updates its internal registers. Now controlling a 7 segment display like this is OK, but we can do much datasheef.

Once you do this the number will be updated on the 2 LED modules. If the pushbuttons are pressed, they go to a HIGH state.

The pin-out for the is shown below, and the datasheet is available at here. When HIGH, it is store mode. This provides a little over 5ma for each segment.

The binary value is dafasheet equivalent of the decimal value of 6. Using binary coded decimal BCDwe can display any numerical digit on the 7 segment display from 0 to 9- using only 4 pins.

Driving a 7 segment display with a 4511 BCD to 7 Segment Driver

Lastly, the 8 output pins are labeled a, b, c, d, e, f g, which are pins 12, 12, 11, 10, 9, 15, and How the BCD to 7 segment display decoder works is it has 4 pins that intake a binary value. This is why it’s called binary coded decimal. In this example I will be using 2 x and 2 x 7 segment module. The ATmega has These 4 data pins datasbeet fed binary values. This mode is the mode we usually want it in for display purposes.