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TCA9539芯片是不是有问题?

Other Parts Discussed in Thread: TCA9539

 如图所用的TCA9539无法正常工作。通过I2C总线将P0和P1均置低,数码管无法点亮,且TCA9539的P0和P1口电压为3.7V。反复调节与数码管串联的电阻均无效果。