MAX7219是MAXIM公司生产的串行输入/输出共阴极数码管显示驱动芯片，一片MAX7219可驱动8个7段（包括小数点共8段）数字LED、LED条线图形显示器、或64个分立的LED发光二级管。该芯片具有10MHz传输率的三线串行接口可与任何微处理器相连，只需一个外接电阻即可设置所有LED的段电流

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