4_DIGIT_INCANDESCENT

Published:2009/7/1 4:48:00 Author:May | From:SeekIC

Circuit serves for interfacing CMOS logic to multiplexed 4-digit incandescentdisplay. Scan decoder requires only two input NAND gates since blanking is not required. Incandescentdisplay requires 4.5 V at 24mA per segment when direct-driven; with multiplexing, instantaneous power must be 9 V at 48 mA to maintain same average power per segment. Display protection circuit monitors scan oscillator and blanks display if oscillator fails, to prevent high peak cument from degrading display when applied continuously to 1 digit.-A.Pshaenich, Interface Considerations for Nu-meric Display Systems, Motorola, Phoenix, AZ, 1975, AN-741, p 25.



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