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What is the difference between common anode and common cathode 7 segment display?
Wiki User
∙ 10y ago
if we r connecting all anode pins of 7 segments.. It is called common anode.
Common Anode 7-segment display
- The Anode, or (+) is supplied, ( pins 3,8 are connected to + through a resistor)
- So if any of the input pins to turn on the segments go low, they will complete a circuit from (-) to (+) and light a light.
- For example if there is a low signal (-) on pin 10 the G line in the middle will light up.
if we r connecting all cathode pins of 7 segments.. It is called common cathode.
Common Cathode 7-segment display
- The Cathode, or (-) is supplied, ( pins 3,8 are connected to - through a resistor. )
- So if any of the input pins to turn on the segments go high, they will complete a circuit from (+) to (-) and light a light.
- For example if there is a high signal (+) on pin 10 the G line in the middle will light up.
Manimran.R
Nagoba Electronics,
Bangalore.
Wiki User
∙ 10y ago
Wiki User
∙ 15y agothe pure metal is obtain on the cathode ...it is positively charge........
and the impure metal is obtain on the anode.......its negatively charged........
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Why common cathode connection is used in seven segment display using microcontroller 8051?
The output of 8051 micro controller is active high so we must need to use the common cathode type display . it will work glow when any input is high . The anode terminals of leds's of seven segment connected to 8051's output and cathode is common and grounded . so it require common cathode because 8051 provide active high output.
How can you use 7447 to drive a common-cathode display?
When using a common cathode 7-segment display with a 7447 the readout is inverted. Instead of 1000 resulting in an 8, you will see all segments will be off. Since a common cathode display pulls its power from the driving IC chip you could either use an inverter on each input segment or use each 7447 output to forward bias a transistor (turn it on) allowing current draw to come directly from Vcc instead of risking burning out your chip. Note: the series limiting resistors will still be necessary.
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