PCA9554A: What is the difference between PCA9554A and PCA9554?

Ken Chen39

Intellectual 545 points

Part Number: PCA9554A
Other Parts Discussed in Thread: PCA9554

What is the difference between PCA9554A and PCA9554?

over 3 years ago

0 Clemens Ladisch over 3 years ago

Guru 278560 points

The I²C slave address (0100xxx vs. 0111xxx).

0 Chris Ayoub over 3 years ago in reply to Clemens Ladisch

TI__Genius 15345 points

Hi Ken,

Clemens is right, the two devices are identical except for their fixed I2C address. The different I2C address on the PCA9554A allows for up to 16 of these devices (8 of the PCA9554A and 8 of the PCA9554) to be on the same I2C bus.

Best,

Chris

Interface

Interface forum

PCA9554A: What is the difference between PCA9554A and PCA9554?