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1. 半导体数码管

•. a b c d e f g. 12.7.2 二 — 十进制显示译码器. 1. 半导体数码管. 将十进制数码管分成七个字段，每段为一个发光二极管。. a b c d e f g. f g. a b. +. +. +. +. +. a. 共阴极接法. f. b. •. g. +. e. c. d. •. 共阳极接法. e d. c •.

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1. 半导体数码管

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  1. • a b c d e f g 12.7.2二—十进制显示译码器 1. 半导体数码管 将十进制数码管分成七个字段，每段为一个发光二极管。 a b c d e f g f g a b + + + + + a 共阴极接法 f b • g + e c d • 共阳极接法 e d c •

  2. 74LS247 译码器接共阳极数码管。它有四个输入端A0，A1，A2，A3 和七个输出端 。 LT ：试灯输入端，当BI = 0，LT = 0 时，数码管显示8。 BI：灭灯输入端，当它等于零时，数码管各段均熄灭。 RBI：灭零输入端，当BI = 1，LT = 1，RBI = 0，只有当A3  A0 均为零，数码管各段均熄灭。用来消除无效 0。 2. 七段显示译码器 七段显示译码器的功能是把 8421 二—十进制代码译成对应于数码管的七个字段信号，驱动数码管显示出相应的十进制数码。 三个输入控制端：

  3. 74LS247 七段字形显示译码器的状态表 显示 字形 A3 A2 A1 A0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 10 01 1 1 1 ….. 0 0 0 0 0 0 0 1 0 0 0 1 0 0 1 0 0 010 0 0

  4. 74LS247 与数码管的连接 +5 V R a b c d e f g A3 A2 A1 A0 A3 A2 A1 A0 来 自 计 数 器 共阳极数码管 74LS247

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