Multiplexing means that the ground connection (DIG1-DIG3 )for each of the displays is enabled sequentially by driving it LOW while the data for that particular digit is driven HIGH on the 8 LED lines. The connections for each of the individual segments such a ‘A’ are connected together in all 3 digits, so the displays are designed to be used in a multiplexed fashion unless you want all 3 digits to always show the same number or character which generally isn’t all that useful. Instead of the control pins, current limiting resistors can be put on the pins connected to ground so that fewer are needed, but in that case the brightness of the display will vary depending on how many segments are lit at one time so that practice is not really recommended. These 8 control pins should each have series current limiting resistors to prevent damage to the LED module or the uC. To light a particular segment, the control (anode) pin for that segment is driven HIGH. These connections are labeled DIG1, DIG2 and DIG3 in the drawing. The displays are common cathode (CC) type which means that all 8 of the LEDs in each of the 3 digits have their cathodes tied together and these are pulled to ground to enable that digit. The LEDs are labeled segment A thru G and the decimal point is DP. Theory of OperationĮach digit of these displays have 7 separate LEDs comprising the 7 segments of the digit plus an 8th LED that functions as a decimal point. 3-digit 7-Segment display with common cathode (CC)ħ-Segment displays are very useful for making numeric or hexadecimal displays such as for a clock, timer, counter, voltmeter or similar application.KEY FEATURES OF LED 7-SEGMENT 0.56″ RED CC 3-Digit : These 3-digit 7-Segment common cathode red LED displays include decimal points and have a character height of 0.56″.
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