Pca95x4 - I2C GPIO Expander
The PCA95x4 provides 8 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus applications.
PCA9534/PCA9554 and PCA9534A/PCA9554A are identical except for a few differences.
- The removal of the internal I/O pull-up resistor which greatly reduces power consumption when the I/Os are held LOW.
- Each has a fixed I2C address. This allows for up to 16 of these devices (8 of each) on the same I2C bus.