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

over 4 years ago

0 Clemens Ladisch over 4 years ago

Guru 316690 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.

Interface

Interface forum

PCF8574: address floating