dept. of mechatronics engg. intro to ssd and bcd to ssd( conversion ) decoder. lab 09 1
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Dept. of Mechatronics Engg.
Intro to SSD and BCD to SSD( conversion ) Decoder
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Lab 09
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SSD.
A seven-segment display (SSD), or seven-segment indicator, is a form of electronic display device for displaying decimal numerals that is an alternative to
the more complex dot-matrix displays.
The segments of a 7-segment display are
referred to by the letters A to G, where
the optional DP decimal point
(an "eighth segment") is used for the display
of non-integer numbers.[2]
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Types of SSD
1- Common Cathode
2- common Anode
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BCD to SSD Decoder/Driver
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TYPE OF BCD to SSD Decoder ICs 74LS48 Common Cathode Active high O/P
74LS47 Common Anode Active low O/P
In common anode attach pin 3,4 5 with the Vcc through 1k resistor ,and inputs to simply with switched
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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.
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BCD to SSD Decoder ICs
RBI/RBOThis 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.