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PCF8574: address floating

Jamie Tseng
Intellectual 2405 points
Part Number: PCF8574

Hi Team,

Will there be any problem if A0, A1, A2 all floating?

Is there any influence to I2C Address?

Thanks and best regards,

Jamie

  • 0
    Guru 303850 points

    The three address pins are plain CMOS inputs and must not float. If they float, you get shoot-through-currents, the address is random, and I²C accesses are unlikely to work.