SINGLE_LED_CAN_INDICATE_FOUR_LOGIC_STATES

Published:2009/7/1 21:07:00 Author:May | From:SeekIC

The LED is the CSL310L which contains a red LED and a green LED connected back to back and mounted close together in a single moulding. The LED can emit red or green light by controlling the polarity of the applied voltage and if the polarity is switched at a rate of several hundred Hertz the emitted light appears yellow. The four combinations of inputs A and B can therefore be converted to four LED states-red, green, yellow and off. The truth table shows the LED colors corresponding to the combinations of A and B levels. Truth TableA B X Y LED Color1 0 0 1 0 red0 1 0 0 off1 0 0 1 green1 1 C C yellow



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