![]() Truth Table – For common cathode type BCD to seven segment decoder: ![]() This BCD to seven segment decoder has four input lines (A, B, C and D) and 7 output lines (a, b, c, d, e, f and g), this output is given to seven segment LED display which displays the decimal number depending upon inputs. First, our decimal number is changed to its BCD equivalent signal then BCD to seven segment decoder converts that signals to the form which is fed to seven segment display. Common Anode Type: In this type of display all the anodes of the seven LEDs are connected to battery or +Vcc and LED displays digits when some ‘LOW’ signal is supplied to the individual cathodes.īut, seven segment display does not work by directly supplying voltage to different segments of LEDs.Common Cathode Type: In this type of display all cathodes of the seven LEDs are connected together to the ground or -Vcc(hence,common cathode) and LED displays digits when some ‘HIGH’ signal is supplied to the individual anodes.ISRO CS Syllabus for Scientist/Engineer Exam.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys. ![]()
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