Other Parts Discussed in Thread: TCA9539
TCA9539采用5V供电,p1和p0口接2k电阻,再接到2段8位共阳极数码管的阴极,数码管阳极通过120欧姆电阻接到5V电源。通过I2C总线配置TCA9539的引脚输出低电平,结果数码管不亮,TCA9539的输出脚电压为3.7V。请问怎么解决?
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