Dept. of Mechatronics Engg. Intro to SSD and BCD to SSD( conversion ) Decoder. Lab 09 1

SSD. 2  A seven-segment display (SSD), or seven-segment indicator, is a form of electronic display device for displaying decimal numerals that is an alternative todisplay devicedecimalnumerals the more complex dot-matrix displays.dot-matrix  The segments of a 7-segment display are referred to by the letters A to G, where the optional DP decimal point decimal point (an "eighth segment") is used for the display of non-integer numbers. [2] [2]

Types of SSD  1- Common Cathode 3  2- common Anode

BCD to SSD Decoder/Driver 4

TYPE OF BCD to SSD Decoder ICs  74LS48  Common Cathode  Active high O/P  74LS47  Common Anode  Active low O/P 5 In common anode attach pin 3,4 5 with the Vcc through 1k resistor,and inputs to simply with switched

BCD to SSD Decoder ICs  Lamp Test : LT pin is used to check all LEDs of Seven segment display by Grounding only this pin in common anode configuration. 6

BCD to SSD Decoder ICs 7  RBI/RBO This pin is used in Ripple Blank input/output Cases.

TASK :1 Construct a digital system using a 74LS47 IC that decodes a BCD number and displays it on a seven- segment display. NOTE:74LS47 ICs feature active-low outputs designed for driving common-anode LEDs.