A
seven segment display is the most basic electronic display device that
can display digits from 0-9. They find wide application in devices that
display numeric information like digital clocks, radio, microwave ovens,
electronic meters etc. The most common configuration has an array of
eight LEDs arranged in a special pattern to display these digits. They are laid out as a squared-off figure ‘8’.
Every LED is assigned a name from 'a' to 'h' and is identified by its
name. Seven LEDs 'a' to 'g' are used to display the numerals while
eighth LED 'h' is used to display the dot/decimal.
A
seven segment is generally available in ten pin package. While eight
pins correspond to the eight LEDs, the remaining two pins (at middle)
are common and internally shorted. These segments come in two
configurations, namely, Common cathode (CC) and Common anode (CA). In CC
configuration, the negative terminals of all LEDs are connected to the
common pins. The common is connected to ground and a particular LED
glows when its corresponding pin is given high. In CA arrangement, the
common pin is given a high logic and the LED pins are given low to
display a number.
Pin Diagram:
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