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I2C访问PCA9539PWR 问题

Other Parts Discussed in Thread: PCA9539

您好,同一系统中采用多款基于I2C的芯片,现在问题是I2C可以对SII9013和ADV7401正常访问,但总无法PCA9539得到应答信号,~~I2C的从机地址、速率、上拉电阻和时序都测过了,没有问题~~望有经验的专家提供建议~

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